THE INTERNATIONAL ADVISORY COMMITTEE
ON THE J-PARC PROJECT

Final REPORT
Meeting held Feb 21-22 2011
Tokai, Japan

Complex T2K event in the near detector tracker circa March 23rd 2010
8 April 2011

Contents

EXECUTIVE SUMMARY .................................................................................................................................. 3
J-PARC as an International science laboratory ......................................................................................... 3

INTERNATIONALIZATION OF J-PARC ............................................................................................................. 5
GENERAL STATUS OF THE PROJECT .............................................................................................................. 5
MANAGEMENT: J-PARC, KEK, AND JAEA...................................................................................................... 6
BUDGET ......................................................................................................................................................... 7
STATUS OF THE ACCELERATOR SYSTEMS...................................................................................................... 8
SCIENTIFIC PROGRAMS……………………………….…………………………………………………………………………………………10
PARTICLE AND NUCLEAR/HADRON PHYSICS .......................................................................................... 10
HADRON EXPERIMENTS .......................................................................................................................... 10
NEUTRINO EXPERIMENTS ....................................................................................................................... 11
Hadron User Association......................................................................................................................... 12
Material and Life Sciences ...................................................................................................................... 13
MLF Accomplishments and Status .......................................................................................................... 13
MLF Instruments ..................................................................................................................................... 14
MLF - achieving maximum science impact ............................................................................................. 15
Muon Science and the MUSE facility ...................................................................................................... 17
NUCLEAR TRANSMUTATION ....................................................................................................................... 17
USER SUPPORT AT J-PARC........................................................................................................................... 20
USER OFFICE SUPPORT................................................................................................................................ 20
CONCLUSIONS ............................................................................................................................................. 20
Appendix I ............................................................................................................................................... 22
Appendix II .............................................................................................................................................. 24
Appendix III............................................................................................................................................26

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EXECUTIVE SUMMARY:

The tragic events in Japan on March 11th rendered the relevance of this report secondary to the recovery
efforts needed to care for survivors and displaced people, to rebuild the country `s infrastructure and torestart the J-PARC complex. The IAC was relieved to learn that no losses of lives were reported at the JPARC site and that the present J-PARC team is poised to take on the extra challenge of rebuilding theaccelerators and experimental facilities. The recommendations of the IAC are to be taken as reflecting
the situation before the earthquake and should be viewed as a record of the meeting`s discussions. The
IAC hopes that the content of this report will be useful in time when the reconstruction is complete. The
IAC would like to express its sympathy for the trauma that our colleagues are experiencing and offers to
be of assistance in the recovery effort as may be required.

J-PARC as an International science laboratory
The International Advisory Committee (IAC) for the J-PARC project met on February 21st and 22nd
2011 at the J-PARC centre, Tokai and toured the main J-PARC experimental facilities. The IAC thanks
the Director of KEK- Dr. A. Suzuki, the Associate Director of JAEA- Dr. H. Yokomizo, and Dr. T.
Fujiyoshi Director of the Office for Quantum Radiation Research at the MEXT ministry foraddressing the IAC and presenting the view of the partners in the project. The IAC thanks the JPARC director Dr. S. Nagamiya for providing a comprehensive view of the laboratory throughdetailed presentations from his staff as well as from users representatives and advisory committee
chairs. Hence the IAC received a very global view of the project on which to formulate its
recommendations.
The IAC is pleased to witness the tremendous strides forward that have taken place in the last year
and the emergence of world class science on all fronts. The facility has moved rapidly from theconstruction phase to the exploitation phase and is delivering a user program that is attracting alarge community as measured by the increasing number of proposals being submitted and by theuser presence on site. The IAC was also pleased to hear some of the early results in thepresentations by several young and active participants in the program.
This comes at the right time; the Japanese government is implementing its S&T strategy whichplaces Research, Development, and Innovation as the cornerstone of its policies. IAC thanks
Fujiyoshi-san, Director of the Office for Quantum Radiation Research with MEXT for clearly
establishing the goals of the program and its vision for J-PARC’s role in this strategy. KEK and JAEA
have built J-PARC into their respective road map for the future and are committing to the success ofthe program even though faced with budget and personnel limitations. The latter are creating nonnegligible tensions in the system which is being controlled with better communication tools at the
management level.

3One of the measures of the quality of the infrastructure which has been developed at J-PARC is thebeam availability achieved during the past year user time; this reached 90-95%, an efficiency rarely
obtained at this stage of a new accelerator complex’s life. This achievement is the result of
dedicated work by a talented team at J-PARC and has now raised the expectations of the user
community (nationally and internationally) which is pushing for more and more beam time andincreased beam intensities.
The challenge then is to accommodate the understanding and the development of the accelerator
complex while delivering stable and reliable user beam time. Many of the concerns, which now
occupy management, are those associated with excellent operation of the multiple components of
the J-PARC complex, and raising the performance towards the design goals. The achievement ofthese goals can be facilitated or hampered by the management structure and performance.
Recommendation: IAC recognizes that both KEK and JAEA have placed J-PARC on their respective
roadmaps for their future. J-PARC has succeeded to function remarkably well despite the complex
and different relationships between the two partners, KEK and JAEA, and J-PARC. Someenhancements in the relationships between the J-PARC Directorate and the KEK Directorate haveoccurred over the past two years. While these changes undoubtedly point in the right direction,
more should be done to ensure that the available resources are optimally deployed to achieve theoverall scientific goals of J-PARC.
The role of the J-PARC centre Director is key in the development of J-PARC and its positioning on
the world scene. IAC recommends that both host institutions strive to maintain the international
calibre of the position.
On the technical side, the IAC endorses the recommendations of the A-TAC committee (seeAppendix III for the full ATAC report) that global strategies for both the energy upgrade and for theintensity development be established and monitored in concert with the user community which has
to buy into the process. A-TAC was satisfied that a credible plan has been developed for the energy
upgrade. However the intensity upgrade is still in the design phase. It is significantly behind theenergy upgrade.
Recommendation: The operations plan should be augmented by a J-PARC-wide technical upgrade
plan that describes the configuration of the complex, associated performance goals through theupgrade period, and ensures that the necessary resources are available.
The IAC recognizes the budgetary pressures faced by KEK and JAEA in supporting a strong user
program while updating/improving the technical capabilities of the accelerator complex. The IAC is4

concerned by the imbalance of support from the two partners which has now developed and, inparticular, the absence of the needed level of support to the Main Ring operations andimprovements critical to ensure international leadership in long baseline neutrino, hadron science,and rare kaon decay programs.
Recommendation: All of the participants, J-PARC, KEK, and JAEA must continue and redouble
their efforts to secure the appropriate levels of funding for all aspects of the J-PARC program.
INTERNATIONALIZATION OF J-PARC
J-PARC is already attracting a large non-Japanese community mainly in its flagship neutrino
program and some of the hadron experiments. Commitment to future particle physics experimentswith muons are also being pledged and the quality of the neutron beams is being noticed byexternal users. The IAC is pleased with the considerable support by both the J-PARC centre and by
local authorities to improve access and environment for users with a particular attention to foreign
users.
J-PARC is developing and implementing a strategy to aim at increasing the participation of Asian
communities. The first join meeting with Korean researchers took place last August and will lead to
new involvements for example in material science. Similar efforts are being made towards China
and Taiwan. A neutron scattering association has been formed regrouping Asian and Oceania
countries to promote this science, with J-PARC MLF being one of the foci.
The IAC very supportive of these efforts and considers that a large potential exists for making JPARC a truly international facility.
GENERAL STATUS OF THE PROJECTThe International Advisory Committee (IAC) for the J-PARC project met on February 21st and 22nd
2011 at the J-PARC centre, Tokai and toured the main J-PARC experimental facilities. The IAC thanks
the director of KEK- Dr. A. Suzuki, the Associate Director of JAEA- Dr. H. Yokomizo, and Dr. T.
Fujiyoshi, Director of the Office for Quantum Radiation Research at the MEXT ministry foraddressing the IAC and presenting the view of the partners in the project. The IAC acknowledges
the second participation of the Mayor of Tokaimura to the reception on Monday which
demonstrates the commitment of his administration to making J-PARC an attractive international
destination.
The IAC heard reports from the Accelerator Technical Advisory Committee (A-TAC), from the Muon
Science Advisory Committee (MUSAC), from the chairs of the Nuclear and Particle physics, andNeutron Program Advisory Committees, from the representatives of the neutron users, muon5science users and hadron users. Presentations on the status of the laboratory by the Director- Dr. S.
Nagamiya and on the status of the technical facilities were supplemented by science presentations
highlighting the recent scientific achievements. Hence the IAC had a very global view of the projecton which to formulate its recommendations.
The IAC is pleased to witness the tremendous strides forward that have taken place in the lastyear and the emergence of world class science from all fronts. The facility has moved rapidly
from the construction phase to the exploitation phase and is delivering a user program that is
attracting a large community as measured by the increasing number of proposals being
submitted and by the user presence on site. The IAC was also pleased to hear some of the early
results in the presentations by several young and active participants in the program.
MANAGEMENT: J-PARC, KEK, AND JAEA
As was discussed a year ago, the construction phase of J-PARC is complete; some aspects ofsupplementary construction are complete; and many of the concerns, which now occupy
management, are those associated with excellent operation of the multiple components of the
J-PARC complex, and raising the performance towards the design goals. The achievement ofthese goals can be facilitated or hampered by the management structure and performance. The
recommendations of 2010 were targeted at balancing and mirroring the management
structures espoused by the two partners JAEA and KEK in which J-PARC is embedded. Some
progress was made, albeit at the level of standing meetings and communication. At thepractical level of resource management the effects of the changes were limited. In the past
there was a clear difference in the relationship enjoyed by the J-PARC center with the twoparent organizations, JAEA and KEK. In particular there was little control, by the J-PARC director,of the resources coming from KEK.
More recently, the organizational situation between J-PARC and KEK has been somewhat
clarified. There are now regular meetings, between Yokomizo (JAEA), Kamiya (KEK) andNagamiya (J-PARC Director) in the first instance, and between J-PARC Director (Nagamiya) andthe KEK Directors in the second instance. These initiatives have improved coordination. The
J-PARC Director can influence the situation but this does not completely mitigate the absenceof control of the KEK resources by the J-PARC management. The government has provided
some operations support directly to J-PARC. This has permitted the access to the facilities to bebroader than under the direct JAEA organization. This was a very good development. This socalled “third party” construct is intended to be independent of KEK and independent of JAEA. It
comes as a result of a specific law promoting the provision of user facilities. Funding has also
been provided through a “new organization” to support extended activity in neutron sciences.

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Again, the motivation by the government (MEXT) to provide for user access to neutron facilities
is the driver.
As a result of these observations, we can comment:•••

It is important that further efforts to balance the mode of participation between
JAEA and KEK be aggressively pursued.
The funding scheme used for the neutron science initiative appears to have
many advantages for the management of J-PARC and it is a construct whichmight be used in other areas of the program.
The need for some degree of independence of the J-PARC management has beenrecognized by MEXT.

Recommendation: J-PARC has succeeded to function remarkably well despite the complex
relationships between the two partners, KEK and JAEA, with the J-PARC centre. Someenhancements in the relationships between the J-PARC Directorate and the KEK Directorate haveoccurred over the past two years. While these changes undoubtedly point in the right direction,
more should be done to ensure that the available resources are optimally deployed to achieve theoverall scientific goals of J-PARC.
BUDGET
The budgetary outlook has evolved both in the level of support and in its structure. In order toachieve the science goals for J-PARC strong support was sought in several areas:
On the operation side, increasing the number of user beam cycles from 6 currently to the
optimum goal of 9 cycles per year is a priority (one cycle is approximately 22 days of user time).
The proposed budget for JFY2011 can support 8 cycles for the 3GeV operation from a
combination of funds from a New Scheme by the government and JAEA. Unfortunately, thelevel of operating support provided from KEK allows only 6 cycles of user time. J-PARC plans to
use what limited flexibility it enjoys to provide the marginal cost of operating the MR of theextra two cycles. The IAC supports the effort by the Director to try and identify extra support for
running 8 cycles for the whole complex. On the construction budget, aside from regular maintenanceand minor upgrades, several major projects are either underway or awaiting decisions.

Recently, important components of the development program have been funded: the energy
upgrade (LINAC to 400MeV and upgrades to the beam transport to the RCS has been fundedover 3 years by a special budget allocation over three years (48 OkuYen) while new funds are
made available for completing and supporting more neutron beam lines in the MLF.
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For the intensity upgrades projects, several key decisions must be taken soon to develop acredible plan, as noted in the report of A-TAC (see Appendix III), and seek the necessary capitalfunding. In particular, the remaining R & D uncertainties still present in the upgrade plans forincreasing the beam intensity in the Main Ring (Power supplies upgrade and high gradient RF)
prevent the elaboration of specific capital requests for funding to KEK management require
strong support in personnel and resources from J-PARC/KEK’s accelerator group for the R&D
studies . There are similar uncertainties on the 50 mA ion source and new RFQ needed to reachfull design power in the RCS, which are under the funding responsibility of JAEA. In addition,
there are several experimental facilities projects of high priority to J-PARC and to its users
which are thus far not funded, they include:• Substantial improvements to the muon facilities and most urgently installation of
the front end components in the target tunnel.
• High Momentum proton beam line in the present hadron hall.
• Phase 2 Hadron Hall extension (under consideration by RIKEN)
On this later point, it is important to negotiate with RIKEN how they could contribute andparticipate in the hadron program. The IAC encourages a speedy negotiation between thepartners KEK, J-PARC and RIKEN.
Overall, the relative level of support for J-PARC in 2011 from JAEA (including a substantial
fraction of operation and capital funding from the new scheme) and that from KEK approaches
a factor 2.
Recommendation: The imbalance of support from the two partners and, in particular, theabsence of the needed level of support to the Main Ring 8 cycles operation and to its
improvements necessary to ensure international leadership in long baseline neutrino and rarekaon decay programs, is regrettable. All of the participants, J-PARC, KEK, and JAEA must continue
and redouble their efforts to secure the appropriate levels of funding for all aspects of the J-PARC
program.
STATUS OF THE ACCELERATOR SYSTEMS
Routine operation of the RCS at 200 kW, of the MR fast extraction at 135 kW and MR slow
extraction at 3.6 kW have been achieved with good beam delivery efficiencies which has led toan active science program.
During the beam development time, careful beam studies and simulations identified all the
major loss mechanisms related to space charge and foil scattering.
8The Linac energy upgrade to 400 MeV is proceeding well, with many components alreadydelivered and being tested. Efforts are being made to reduce the downtime period for
installation during the summer 2012 from 8 to 6 months. The schedule for final installation
during the summer of 2012 is reasonable. The IAC endorses the A-TAC conclusion that theenergy upgrade is in good shape.
For the intensity upgrade, the front-end (new ion source, new RFQ...) upgrades are in an earlystage of design and will be completed after energy upgrade. The overall plan for 1 MW beam
power from RCS after the energy and intensity upgrade of the front end is realistic. This is not
the case for the MR intensity upgrades. The plan for 750 kW beam power for MR fast extraction
will require the cycle time to be reduced from 3.2 s to 1.2 s. This will need new MR main power
supplies.
Although slow extraction from MR has made good progress with excellent extraction efficiency and
up to 30% duty factor, a 100 kW slow extracted beam power with good efficiency and duty factor
will require significant improvements and likely the development of new power supplies for themain ring with very low ripples. Several options should be investigated as recommended by A-TAC.
The most aggressive support possible for the J-PARC Main Ring modifications leading to increased
power and enhanced duty factor is mandatory if J-PARC is to confirm its leadership in long baseline
neutrino physics and to take a leadership role in the field of rare kaon decays.
The ATAC believes that the development of strategies for reducing the MR cycle time is a necessary
investment to reach 750 kW of fast extracted beams and should be continued. However, the MRplan presented is not sufficiently developed to be deemed “credible”.
Recommendation: Schedule sufficient machine study periods for both RCS and MR to support
machine performance improvements and the ambitious upgrade program.
Recommendation: Develop a strategy for achieving slow extracted beam power approaching 100
kW that is supported by simulations. The strategy should take into account all known intensity
dependent effects, incorporate comparison with beam experiments, as possible, andaccommodate losses up to a few kW in the extraction region.

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SCIENTIFIC PROGRAMSPARTICLE AND NUCLEAR/HADRON PHYSICSThe J-PARC program of particle and nuclear physics is supported primarily by the operation of the
30 GeV Main Ring (MR). The hadron program uses slow extraction to a number of beam lines in the
hadron hall. The neutrino beam uses fast extraction and sends an off-axis neutrino beam in the
direction of the underground water Cerenkov detector Super-Kamiokande at Kamioka nearly 300
kilometers from Tokai. For the hadron experiments the quality and duty factor of the beams areimportant. For both hadron and neutrino experiments, beam power is important.
The IAC was very impressed with the improvements both in fast and slow extracted beam. Long
term operation above 100 kW for the neutrino experiment and the achievement of 99.5% slow
extraction efficiency are great steps toward the higher power operation. J-PARC completed the firstexperiment in the hadron hall (E19). The IAC congratulates the J-PARC management andaccelerator team for these achievements.
HADRON EXPERIMENTS
Currently there are two charged particle beams K1.8 and K1.8BR, which will support a number ofexperiments using charged pion and kaon beams to search for and examine nuclear structure andnuclear matter to study QCD under some specific and extreme conditions. Some are hypernuclear
experiments which provide information on the forces inside the nucleus. Another searches for an
exotic bound state called a pentaquark. The IAC congratulates J-PARC accelerator and beam line
team and experimental groups for many accomplishments made during fall 2010 running. The
power and the duty factor of the slow extraction beams have been greatly improved. Hadronexperiments in the secondary beam lines (K1.8BR and K1.8) have observed charged kaons well
separated from charged pions. The E19 (pentaquark search) in the K1.8 area took the first physics
data successfully with 1.92 GeV/c pion beam, establishing a upper limit on the production crosssection of the Θ+ via (π-p  K-Θ+) at the 0.3 μb/str level.
The IAC acknowledges that slow-extraction users and accelerator division met to improve
communication. Short and long term plans for the slow-extraction beam improvement have been
discussed. We encourage users and accelerator division to continue their good communication.
Also being developed is a rare kaon decay installation, which will search for the decay of the K0L into
a π0 and neutrino-anti neutrino pair. The current state of the art suggests that this mode offers awindow on new physics. Development of the beam line, which is being operated in test mode, andthe experiment, will take place over the next couple of years. Progress has been made on each. The
IAC is pleased to hear that the K0L beam line has observed neutral kaons (K0L  π+π-π0) and had asuccessful engineering run with the CsI calorimeter originally used in the KTeV experiment at
10

Fermilab. This experiment will require the utmost performance of the accelerator in terms of powerand duty cycle. Other facilities include another low energy beam, K1.1BR and an extracted highmomentum, primary, proton beam. The new K1.1BR beam line was successfully commissioned andis open for test-beam users. J-PARC is congratulated for this accomplishment.
E16 in the high momentum beam line (E16) is to measure the mass modification of vector meson in
nucleus using Φ  e+e-. High intensity beam and a large acceptance spectrometer are needed forthis experiment. Funding for the high p beam line has been requested in the FY2010 budget. This
would complete the complement of beam lines intended for the first phase of hadronexperimentation. In this context and expecting that there will be little conflict with the program to
improve the existing slow extraction performance, the IAC supports this initiative.
Eventually to fully exploit the capabilities of the machine it is expected that the large hadron hall be
extended. At present the funding for the extension is not in the planning although we heard an
intriguing thought that the RIKEN organization might take on this task. The IAC encourages the JPARC management to explore further this possibility.
Planning for operation for the next year reflects the tensions in play. Given the priority of theneutrino beam, it is likely that 60 days or less of hadron beam operation will be available in thiscoming year. In this context, the PAC has offered a set of priorities. However, the IAC would not liketo see the laboratory sacrifice its longer-term needs for the beam duty factor and power to improveto an extended run of experiments for which the beam conditions fall short.
NEUTRINO EXPERIMENTS
The T2K collaboration with about 500 members from 62 institutions in 12 countries is a strong
international collaboration. The T2K experiment, directing a muon neutrino beam from theMain Ring toward the Super-Kamiokande detector, is the centerpiece of the particle andnuclear physics program at J-PARC. There has been impressive progress in the past few years:
Beam line completion in 2008; the first beam to neutrino beam line and beam commissioning in
April-May 2009; the installation of the second and third horns and the completion andcommissioning of the on-axis near detector (INGRID) in June-October 2009; the completion of
the off-axis near detector and the first neutrino event in both near detectors in NovemberDecember 2009; the start of physics data taking in January 2010; and the first J-PARC neutrino
event in the Super-Kamiokande detector on February 2010. T2K now has 48 neutrino eventsand the collaboration plans to release the first oscillation results soon. The IAC congratulates
the J-PARC/KEK team and the T2K collaboration for this incredible progress and success.

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The T2K has strong international competitors from other reactor- and accelerator-based
neutrino oscillation experiments with a similar goal of improving sensitivity to the unknown
mixing angle sin2(2θ13) to a level of 0.01 or beyond. In order for T2K to remain competitive or toobserve electron neutrino appearance implying, a finite sin2(2θ13) first, J-PARC will have toimprove beam power rapidly. The IAC was presented with a viable 5-year Main-Ring beam plan.
The long shutdown planned in 2012 for the installation of the 400MeV linac will have a large
impact on the physics output from T2K. Given the competitive situation with the reactor
experiments and the NOvA experiment, the IAC recommends that every effort to minimize the
no-beam period.
Recommendation: The IAC urges that a clear strategy for maximizing the impact of T2K be a
critical component of an overall J-PARC strategic plan in the face of strong international
competition.
Recommendation: The T2K neutrino experimental program is well advanced. On the other
hand the hadron program is still in its infancy. Nevertheless, we already see the competition
between the two, and within the hadron program for both beam time and for construction
resources. Several experiments seek 100% of the full power beam with excellent duty cycle. It
is imperative that the user community see a path to the completion of their experiments. We
recommend that J-PARC develop, in conjunction with its users, a flexible plan for seeking
funding, for construction, and for operation over a five year period which is tenable.
Hadron User Association
The IAC heard a report from the Hadron Users Association (HUA) which represents more than
160 Institutes, 25% of them being foreign. It has organized successful Activities: workshops,
meetings, student awards and is articulating the needs of users to J-PARC management.
The scientific operation of the Hadron Hall has started successfully. However slow extracted
beam time given to Hadron users has been moderate (20%), with intensities too low for severalof the approved experiments requiring high statistics. For those, only commissioning ofequipment or beam lines can be done under such conditions. This is valuable in the short term
but would lead to too long data taking time (>6 years) for some experiments. Also the limited
quality of the beam (poor duty cycle) precludes coincidence experiments.
It is critical to provide a realistic plan for increasing the beam intensity and improving the duty
factor of beam spill to enable the proposed vigorous scientific user program. The range ofcompetitive and rich hadron and nuclear science can be greatly expanded by providing
additional beam lines and advanced instrumentation.
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The IAC heard from the IPNS PAC chair how the PAC is approving experiments, monitoring theirprogress and prioritizing the program in particular recommending the distribution of slow
versus fast extraction time. The IAC is satisfied that the process is fair and in accord withinternational standard.
Recommendations:
J-PARC in conjunction with HUA should develop a mid- term strategy for implementing
prioritized experiments as beam intensity increases are realized. It recommends that the IPNS
PAC be the arbitrator of the beam time assignment within that strategy.
The IAC noted the request for more space in the experimental area and was given a shortbriefing on the possibility that RIKEN would be prepared to seek funding for the extension of
the hall and providing an additional production target. The IAC welcomes this initiative andencourages speedy negotiation between the partners J-PARC, KEK and RIKEN to establish theconditions of such a participation The committee notes that RIKEN has established successfully
similar joint centres with foreign institutions (BNL-RHIC, RAL-ISIS, MIT…).
Material and Life Sciences
MLF Accomplishments and Status
The IAC was pleased to hear about recent successes in the initial user’s operation at 200 kW
beam power. The reliable operation of the neutron source is critical for the large community ofusers who are ready to perform experiments at the MLF. Some of the highlights of the lastyear’s beam delivery are:
•

•
•
•

•

Recent, sustained increase in beam power to MLF exceeding 200 kW is enablinga vigorous scientific user program. The range of science will expand as beam
power is increased to match the quality of the advanced instrumentation
Beam availability to MLF has been very high (>90%), apart from failure of thehydrogen accumulator.
The hydrogen accumulator was successfully replaced and high power highavailability operation resumed.
Good progress was made in developing mitigation of the pitting damage to Hg
target using micro-bubbles. This work is important for making full use of thebeam power available now and in the future from the RCS.
A spare target incorporating the bubbler system will be produced by this summer

Comments:
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The RCS is capable of delivering more beam power than can be handled by the current MLF
mercury target system. Mitigation of mercury target damage caused by pitting is vital for
realizing the full beam power capability of the RCS. The development activities related tomitigation of pitting damage by introducing micro-bubbles into the helium flow show good
progress. Development of another spare target with the capability of introducing bubbles, now
on-track for delivery in summer 2011, should receive high priority. In addition, it is necessary tobuild up an inventory of spare target assemblies so that the beam power is no longer limited bylack of spare components.
Recommendation:
1. Proceed with the plans to deploy the next generation target incorporating cavitation
mitigation as soon as possible.
2. Incorporate plans for target development and spares acquisition into the overall planfor beam power scheduling for the MLF.
MLF Instruments
The number beam lines and instruments currently running, being installed or beingcommissioned is quite impressive with only 5 ports out 26 still to be allocated. The 21 allocatedinstruments are distributed as follows:-

9 operating instruments
3 undergoing commissioning
6 under construction
3 at the planning stage

The IAC congratulates the team for building up the experimental capabilities very quickly andinitiating an experimental program on 10 instruments. A notable success is the early
engagement of Industry for the construction and use of the instruments – as witnessed by the
support of Ibaraki Prefecture and the establishment of Industrial networks, such as Neutron
Industrial Users Society, to promote the use of neutron beam research in industry.
The committee was pleased to hear that management has secured the establishment offinancial resources for user support at the level of 6 FTE’s per instrument, which is recognizedinternationally as the base requirement for a highly successful user program. It is essential
however that these resources are used coherently across all instruments at the facility – thiscan only be achieved if such resources are managed at facility level. Furthermore, as the IAC has
noted in the past, standardization is essential in order to maximize the utilization of available
resources.
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The committee noted that many activities are taking place in the MLF facility: instrument
construction, installation, and commissioning must coexist with the establishment of a full user
program. Experience at other facilities shows that it is essential that all participants remainaware of the safety risks involved with the associated changing conditions and that good
coordination of all activities in the experimental hall, with a keen eye on the safety aspects,
must be high on managements radar screen. In particular, the committee noted the need forstorage space, and associated support manpower to accommodate the large number ofsamples being generated by the facility – a coherent structure and policy for dealing with user
sample must be put into place.
Along the same lines, it is also essential that the MLF share best practices and capabilities
internationally, in particular in the areas of sample environment, detectors and software - there
is great deal to do with few resources. Internal efforts to develop analysis software did notseem well coordinated. The committee heard about the efforts to develop the STARGazer and
Z-Rietveld analysis packages; while these are both clearly worthwhile projects they did notseem to fit into any overall facility scheme. Given the rather scarce resources for softwaredevelopment worldwide, we would recommend a more strategic view to softwaredevelopment.
The IAC would like to re-iterate its recommendation from last year as it was misinterpreted andis still relevant now:
Recommendation:
The IAC recommends that J-PARC adopts a coordinated and coherent approach to theoperations and future development of the MLF, embraced by all partners. This will require anorganizational structure that enables both the scientific and technical development to beowned equally by all partners and a process which ensures that the evolution of the
instrument suite delivers world leading instruments fitting into a coherent strategy agreed
upon by all stakeholders. The IAC recommends that great care be exercised in allocating theremaining 5 beam lines as they represent an extremely valuable resource.
MLF - achieving maximum science impact
It was a pleasure to hear brief summaries of recent scientific achievements at the MLF, bothfrom facility staff, and from members of the external user community. A growing and diverse
portfolio of science is now being addressed at levels of sophistication that approach the best in
the world. Attracting international users – at a modest level – will help benchmark current MLF
capabilities and provide impetus for future developments. All the hallmarks to create and15

operate a world-ranking facility are now in place, with a high potential to generate high impact
science.
To consolidate this potential, it is essential to achieve a balance between in-house and user
science programs in such a way that each enhances the other. The facility will be eventuallyjudged by the impact of the scientific output and the range of scientific disciplines that makeuse of the neutron capability. This necessarily requires the implementation of a coherent
strategy to achieve this impact which intertwines the internal and user science programs acrossall instruments at the facility. Hence, the selection process for all experiments at the facility
must be carried out in a uniform way that allows MLF management to gain full understanding
and oversight of the direction of the science program.
The IAC heard from the chair of the program advisory committee for neutron research andfrom the user‘s group representative. The procedures adopted to date, while adequate at thisstage in the development of the facility, are fragmented; different experiment categories(Public, IP, S type etc.) are treated differently; this is inhibiting the facility from getting an
overall view and direction of the science.
Furthermore the processes invoked will not stand up to expansion to the expected scale of theuser program over the next few years. Other leading international facilities have been throughsimilar expansion and consolidation exercises and best practices (transparency, inclusivity androbustness including the engagement of international referees) for the selection of thescientific program is already established at other. Experience at other facilities shows thathaving large panels of reviewers coming to the facility is an excellent way of engaging thecommunity and providing valuable feedback to the facility on the level and direction of sciencethat can, and is being, carried out.
The facility is concerned about high level scientific productivity - the above mentioned panel
meetings can help the facility obtain input for science directions that will drive hiring andinstrument development. Furthermore it is essential to solicit feedback from users andreviewers and panel members as part of the process. A broad based internal scientific culture
within JPARC needs to be established as a focus to attract and serve a sophisticated user
community. This can be accomplished in many ways but should not compete with the externaluser community – rather an atmosphere of collaboration and partnership should be developed.
Users have to feel that they own the facility. The committee strongly recommends that a seriesof focused workshops/retreats be established with the dual purpose of defining a science
direction/strategy and engaging a broader scientific community with the facility. On a similarnote the IAC recommends that a good cooperation between Quantum Beam activities/facilities16

be nurtured. It could start internally by embracing the potential of the JRR3M neutron program
to complement activities at JPARC MLF as well as those of the MUSE facility.
Recommendation:
In order to ensure the quality of outcomes in the MLF area it is essential to provide
independent assessment of all research proposals by a single transparent process. This is toassure contestability in the science. To achieve this even the work from within J-PARC and the“partner” must be submitted as proposals and judged. This is the practice at all of the majorinternational institutes such as ILL (France), ISIS (UK), SNS (USA), OPAL (Australia).
Muon Science and the MUSE facility
Construction of the front end of the U channel (high intensity surface muons) has continued while
the MUSE facility has been able to deliver muon to the D1 line. This has generated several
publications already. The IAC heard of several results both fundamental studies (F-electron heavy
compounds) or applied studies (structure of Finemet material). The scientific program is limited by
the lack of beams and spectrometers. IAC notes the budgetary effort by KEK to provide the slow
muon channel front end components up to the muon moderator. A community driven proposal tofund the Ultra slow muon experimental part of the facility has received stage 1 approval and is in
front of the government for funding approval. KEK has made a commitment to identify further
resources to build and install the front end components of the S and H channels while theactivation levels are still tolerable.
The IAC noted also that a road map was developed by the muon user community with a focus on
the use of ultra slow muon beams and that significant outreach activities occurred in the past year
to nurture the muon user community.
Recommendation:
IAC repeats the recommendation that the design, construction the remaining front end elementsof the S and H channels be funded soon so they can be installed in the proton tunnel in theupcoming shutdown needed for the Linac energy upgrade in the summer of 2012 before
significant radiation levels are generated in the muon production target area.
NUCLEAR TRANSMUTATION
Dr. Oigawa’s presentation briefly described the many areas in which the group is involved group in
the framework of JAEA’s 5-year plan (FY 2010-2014) of JAEA. The committee was pleased to hearthat the group follows the recommendations of The AEC of Japan and participates in the
integration of Partition and Transmutation in the Fast Breeder Reactor (FBR) cycle. One of the
new results presented by Dr. Oigawa was the benchmark of calculations of reactor physics
17

parameters using various nuclear data. A report from the AEC concludes that the uncertainties on
an ADS design, revealed by these calculations, justify the importance of minor actinides (MA)experiments using the TEF facility proposed at J-PARC; the R&D program of the TEF facility
includes the spallation target design, beam trip effects, material corrosion, and thermal hydraulicsof the spallation target.
In the original JAERI-KEK joint project of high intensity proton accelerator, the Transmutation
Physics Experiment Facility (TEF) was proposed to study nuclear transmutation technology using
an accelerator driven subcritical system (ADS). This project was based on a 600 MeV high power
accelerator. The present development of J-PARC has not yet allowed reaching the original design
parameters of the accelerator. Thus, the project has received a low priority and has not been
funded. Today, the Transmutation group proposes to adapt the TEF project to the actual situationof J-PARC and prepares a new project that will include experiments on subcritical and criticalexperiments for both ADS and FBR using kg-order of minor actinides fuel. A tentative timeline ofthe project is presented on the figure below. The OECD Nuclear Energy Agency report “Research
and Test facilities required in Nuclear Science Technology” believes that the TEF project may play
an important role if it is adapted into an international framework.
Recommendation: The IAC supports the revised project of TEF. J-PARC should build the TEF
proposal in a new way related to the linac upgrade and toward the development of aninternational activity at J-PARC. The committee requests a detailed presentation next year of
the new project including budget, manpower and collaborations involved in the project...
Year (20xx) 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25400MeV Energy Recovery
LINAC

TEF-P
&
Beam Dump

Conceptual Design
Preliminary Design
Review for Construction
Detail Design

MA Fuel Loading

Safety Review
Construction & Manufacturing
Operation

TEF-T&
SC-LINAC

Preliminary Design
Detailed Design
Construction & Manufacturing
Operation

IAC appreciates the efforts of the J-PARC team to build a strong R&D community bridging
academic and industry technology research, in particular the collaboration with Kyoto University
18

on subcritical experiments using KUCA with DT neutron source. The group has joined the Central
Design Team (CDT) of the European 7th Framework Program (FP7). The IAC is pleased by thisactive participation of the J-PARC group in EU major collaborative experimental programs, inparticular in the EUROTRANS collaboration and the MYRRHA project (an 85 MW prototype ADS in
Belgium).
The state-of-the-art in Accelerator Driven Transmutation and Energy production was recently
reviewed by an international group, appointed by DOE, chaired by S. Henderson and E. Pitcher.
The report “Accelerator and Target Technology for Accelerator Driven Transmutation and Energy
Production” describes the considerable progress accomplished in the field. The report notes that
active ADS R&D programs exist in China, Europe, India, Japan, Russia, South Korea. ADS subcritical systems are recognized to “offer the potential for safely burning fuels which are difficult toincorporate in critical systems, for example fuel without Uranium or Thorium”. Two of theirfindings are of particular interest:••“Technology is sufficiently well developed to meet the requirements of an ADS
demonstration facility; some development is required for demonstrating andincreasing overall system reliability.
For Industrial-Scale Transmutation requiring tens of MW of beam power many of
the key technologies have been demonstrated, including front-end systems andaccelerating systems, but demonstration of other components, improved beam
quality and halo control, and demonstration of highly reliable sub-systems isrequired”

In this context, the Committee is concerned by the relatively small size of the group (10 members).
Although it does contribute to collaborations in the world effort, the Committee believes that amajor increase in the support of the group is needed to have a major impact in this domain. The
work of the Transmutation group should be integrated in a clear and ambitious strategy of J-PARC
with the full support of JAEA. The IAC reiterates that confidence of the public needs coherent
information from universities, public organisations and industry research on the future of Nuclear
power. This is one of the essential keys for continuing to use nuclear power in Japan in the longterm. Difficulties observed in recovering from the sodium leak that occurred in the Monju FBR,
and in Rokkasho’s reprocessing plant have had a negative impact on the public perception of
nuclear power. R&D at J-PARC is a great opportunity for JAEA to demonstrate the progressachieved in the safe use of nuclear power.
Recommendation: The IAC recommends that the Transmutation group builds, with the full
support of JAEA, a strong community around the TEF proposal.
19

The IAC reiterates that the considerable knowledge of Japan in accelerator development, designand safety studies in ADS, fuel studies, materials science, and nuclear data is fundamental toexpand the frontier of knowledge in safe and reliable nuclear waste management.
USER SUPPORT AT J-PARC
IAC heard about the extensive cryogenics support provided by the J-PARC expert group to
facilities and several experiments. J-PARC is also providing liquid helium and nitrogen to theusers free of charge. For this they maintain a refrigeration plant soon to be augmented and asite wide recovery system. A method for planning Helium deliveries on demand is being
established. This support is meeting the expectation of users.
The J-PARC centre computing group is supporting network access to the J-PARC data acquisition
systems on site and to the KEK main central computer system for processing and storage. They
provide an open system of communication independent of JAEA and KEK.
This has allowed for a more flexible access by J-PARC users while respecting the security
concerns of JAEA. The demands from the J-PARC experiments for storage and processing are
growing but are being met by the existing KEK system. Upgrades to the links speed are plannedin 2012 to support the growing scientific effort.
USER OFFICE SUPPORTThere have been significant improvements in lodging, transportation, office, restaurant, shop,and other support functions for users. Users are pleased with the friendly and efficient support
provided by the User’s Office. A new dormitory has been opened which can accommodate 49
users and there is plan for possibly doubling that.
The IAC supports J-PARC’s plan on adding to the new dormitory near the user’s office.
The IAC supports the J-PARC management team efforts towards a simpler gate access control
dedicated to J-PARC user’s and staff, a more convenient access by a new road, and adding more
cafeterias. The IAC thanks the Tokaimura government for their cooperation in solving theseissues.
CONCLUSIONSAs this report was prepared, Japan suffered a tragedy of monumental consequences in lives lostand material damages. The IAC offers its most sincere condolences and formulates the wish
that, within the priorities of the country, the rebuilding effort will allow J-PARC to continue its
20

scientific goals. The IAC is confident that the J-PARC team under the leadership of Professor
S.Nagamiya will be able to restore the capabilities of J-PARC to deliver first rate science. The IAC
and the international scientific community will welcome any request for help to restore thisinternational laboratory to its full potential.

21

Appendix I
Agenda for the International Advisory Committee Meeting of J-PARC in 2011
Date:
Place:

February 21 (Mon) and February 22 (Tue), 2011
Conference room at the Ibaraki Quantum Beam Research Center (IQBRC)[http://www.pref.ibaraki.jp/kikaku/kagaku/kenkyu_kaihatsu/ryoshi_beam.html]

February 21 (Mon)8:50 – 9:30
Report from the Director
9:30 – 10:10
Accelerators(9:30 – 10:10) Progress and Prospects
10:10 – 10:30-- Coffee Break -(10:30 – 11:00) A-TAC Views
11:00 – 12:20
Neutron Science(11:00 – 11:20) Overview of MLF(11:20 – 12:00) Science Highlights(12:00 – 12:20)
12:20 – 13:20
13:20- 14:20(13:20 – 13:35)(13:35 – 13:55)(13:55 – 14:10)(14:10 – 14:20)
14:20 –14:35
14:35– 14:50
14:50 – 15:20
15:20 – 15:45
15:45 – 16:00

Neutron User’s Views-- Lunch -- @Akogigaura Club
Muon Science
Facility Report
Science Highlights

S. Nagamiya (Doc.1)
A. Ando (Doc.2)
T. Roser
M. Arai (Doc.3)
Y. Idemoto (Tokyo U.Sci.) (Doc.4)
N. Yamada (Doc.5)
R. Kajimoto (Doc.6)
S. Harjo (Doc.7)
M. Hayashi (Ibaraki Pref.)(Doc.8)

Y. Miyake (Doc.9)
A. Koda (Doc.10)
T. Ito (Doc.11)
O. Shimomura (KEK)E. Torikai (Yamanashi U) (Doc.12)
T. Ogitsu (Doc.13)
A. Manabe (Doc.14)
H. Oigawa (Doc.15)

MUSAC Report
Muon User’s Views
Cryogenics System at J-PARC
Network and Computing at J-PARC
Accelerator Driven Fission Research
Coffee Break
User’s Office
M. Ieiri (Doc.16)
J-PARC as an International User Facility
16:00- 16:20
Neutron PAC
M. Shibayama(U. of Tokyo) (Doc.17)
16:20 – 17:20
Institutional Views(16:20 – 16:40) KEK and J-PARC
A. Suzuki (Doc.18)(16:40 – 17:00) JAEA and J-PARC
H. Yokomizo (Doc.19)22

(17:00 – 17:20) MEXT and J-PARC
17:20 – 18:20
Closed Session
18:30 Reception at Tokai Plaza Café, IQBRC
February 22 (Tue)8:50 - 9:10
9:10 – 11:20(9:10 – 9:25)(9:25 – 9:40)(9:40 – 10:10)(10:10 – 10:25)
10:25- 10:55(10:55 – 11:10)(11:10 – 11:30)
11:30 – 12:30
12:30 – 13:30
13:30 – 13:50
13:50 – 15:50

T. Fujiyoshi (Doc.20)

Executive Session (Closed)
Particle and Nuclear Physics at J-PARC MR including Coffee
Hadron Hall Progress and Prospect
Y. Sato (Doc.21)
Nuclear Physics at J-PARC
M. Naruki (Doc.22)
Particle Physics at J-PARC
T. Kobayashi (Doc.23)
Future Neutrino Physics
T. Hasegawa (Doc.24)-- Coffee Break –Hadron User’s Views
H. Tamura (Tohoku U.) (Doc.25)
PAC Report
K. Tokushuku (KEK) (Doc.26)
Closed Session & Working-- Lunch – @ Akogigaura Club
Summary Session-- Site Tour –Adjourn23

Appendix II: IAC Committee membership
TRIUMF

Associate Director
Emeritus. Head of
Nuclear Medicine

jmp@triumf.ca

John William White

Australian National
University

Professor

jww@rsc.anu.edu.au

Andrew Dawson
Taylor

ISIS, Rutherford
Appleton Laboratory,
STFC

Director Facility
Development andOperations; Head of
ISIS

andrew.taylor@stfc.ac.uk

Bernard Frois

CEA

Directorbernard.frois@cea.fr

Stuart Douglas
Henderson

FNAL

Associate
director/accelerator

stuarth@fnal.gov

Satoru Tanaka

University of Tokyo

Professor

s-tanaka@n.t.u-tokyo.ac.jp

Hidetoshi Fukuyama

Tokyo University of
ScienceIan Anderson

NScD/ORNL

Sergio Bertolucci

CERN

Young-Kee Kim

FNAL

Vice President andProfessor
Associate Laboratory
Director for NScD
Director for
Research andComputing
DeputyDirector/Professorof Physics

Hugh Montgomery

Thomas Jefferson
National Accelerator
Laboratory

Laboratory Director

mont@jlab.org

Thomas Roser

Brookhaven National
Laboratory

Accelerator Division
Head, ColliderAccelerator Dept.

roser@bnl.gov

Scientific Director
and CEO

H.Stoecker@gsi.deProfessor

et@yamanashi.ac.jp

Principal Researcher

shintake@spring8.or.jp

Jean-Michel A
Poutissou

Hoerst Stoecker
Eiko Torikai
Tsumoru Shintake

GSI Helmholtzzentrum
fuer
Schwerionenforschung
University of
Yamanashi
SPring-8, RIKEN

fukuyama@rs.kagu.tus.ac.jp
andersonian@ornl.gov
sergio.bertolucci@cern.ch

ykkim@fnal.gov

24

Shoji Nagamiya
Yujiro Ikeda
Hitoshi Kobayashi

J-PARC Center
J-PARC Center
J-PARC Center

Director
Deputy Director
Deputy Director

shoji.nagamiya@j-parc.jp
ikeda.yujiro@jaea.go.jp
hitoshi.kobayashi@kek.jp

25

Appendix III: Accelerator Technical Advisory Committee (ATAC) report from the
Chair,Thomas Roser.

Report from the10th Meeting of the Accelerator Technical Advisory
Committee for the Japan Proton Accelerator ResearchComplex (J-PARC)

26

February 17 - 19, 2011
J-PARC Center
Tokai, Japan27

Table of Contents

Introduction ............................................................................................................ 1
Overview of J-PARC operations and power projections ..........................................1
Linac Status ............................................................................................................. 43 GeV RCS, including operations after Linac upgrade .............................................. 6
Main Ring, including operations after Linac upgrade .............................................. 7
Linac energy upgrade .............................................................................................. 8
Ring RF, including high gradient cavity .................................................................... 9
MR power supply upgrade .................................................................................... 11
Impedance, instabilities and controls.................................................................... 13
Appendix I: Meeting Agenda ................................................................................. 1528

Introduction
The Accelerator Technical Advisory Committee (ATAC) for the J-PARC Project held its tenth meeting
February 17 - 19, 2011, at the J-PARC Center in Tokai, Japan. This report of ATAC was presented to the
Meeting of the International Advisory Committee (IAC) on February 21, 2011.
ATAC members in attendance at this meeting included: D. Findlay (RAL), J. Galambos (SNS, ORNL), R.
Garoby (CERN), S. Holmes (FNAL), A. Noda (Kyoto U.), P. Ostroumov (ANL), U. Ratzinger (U. Frankfurt), T.
Roser (BNL, chair), and J. Wei (MSU).
The ATAC wish to express its appreciation to JAEA and KEK management and support staff for their
hospitality during this meeting, and to the J-PARC staff for their excellent and comprehensive
presentations. The ATAC also congratulates the J-PARC team for a spectacular first year of operation,
reaching or exceeding the performance goals for 2010. The Committee also greatly appreciates that the
J-PARC team has carefully addressed all recommendations from the last review.

Overview of J-PARC operations and power projections

The J-PARC complex has now been fully operational, supporting experimental research programs both at
the Materials and Life Sciences Facility and the Main Ring slow and fast extraction facilities, over the lastyear. The RCS is routinely providing 200 kW to the neutron target, and the Main Ring is providing 135
kW of fast extracted beam to the neutrino target and 3.6 kW of slow extracted beam with 99.5%
efficiency to the Hadron Facility. Facility reliability is approaching 95%. These performance levels areboth significantly improved from a year ago and consistent with goals outlined at that time. The 400
MeV linac upgrade is progressing very well and is on schedule for installation in 2012. Planning is welladvanced for the next four years of operations, including the period of installation and commissioning of
the 400 MeV linac upgrade.

Primary Achievements••

200 kW of beam to the MLF on a routine basiso 10 neutron and 1 muon beamline in operationo 2 neutron beamlines in commissioning and 6 under constructiono RCS capable of 300 kW; currently limited to 200 kW by neutron targeto 420 kW of equivalent beam power from the RCS demonstrated on single shots
135 kW of beam at 30 GeV to the neutrino target on a routine basiso Several dozen events observed in T2K detectoro Currently limited by losses/activation in injection/extraction areas

•

•

•
•
•

3.6 kW to the 30 GeV slow extraction programo First experiment completed (penta-quark search)o Significant improvement in extraction efficiency (now 99.5%) and duty factor (now 30%)
over last yearo 10 kW equivalent power demonstratedo Currently limited by extraction efficiency as beam intensity increases
Successful summer 2010 shutdown strongly tied to MR performance improvementso 3-50 BT collimator shieldingo New (fast) MR extraction kicker (8 bunch operations)o 6th rf stationo Transverse bunch-by-bunch dampero Improvements to power supplies to decrease cycle time (3.6 to 3.2 sec)o Dynamic bump systemo Transverse noise kicker
Funding secured to support 200 days of facility operations for users
Funding secured to complete linac upgrade
Multi-year plan established through JFY2014
o Goals unchanged from a year ago
o Incorporates and depends upon the 400 MeV linac upgradeo 1 MW from RCS
o 430-750 kW from Main Ring (fast extraction)o 100 kW from Main Ring (slow extraction)

Comments and Recommendations••

Goals established for JFY2011
o 200 days operations for users at MLF and MR (FX/SX ~2/1)
o 300 kW from RCS
o 150 kW from MR (fast extraction)o 30 kW from MR (slow extraction)
Residual activation is being monitored throughout the facilityo High activation in RCS injection region (>500 µSv/hr @ 30 cm) and MR injection region(>5000 µSv/hr @ 30 cm) need to be addressed in moving to higher beam power.
o Possible sources have been identified (multiple foil strikes in RCS; ringing of injection
kicker in MR)
Continue the activation-monitoring program as intensities are raised in the RCS and MR.
Utilize the information for benchmarking of simulation codes and developing mitigation
strategies as power levels rise.

••

Spares queues are being built up per prior ATAC recommendations
Better understanding of beam loss mechanisms as compared to a year agoo Effective program marrying beam studies to simulations (RCS)o Simulations could benefit from increased study time to provide benchmarking in MR

30

Continue studies aimed at characterizing and understanding losses observed in
the RCS and MR at the highest beam intensities possible.
•

Plan established for improvement of RCS to 1 MW by 2014
o Reliant on completion of 400 MeV linac upgradeo Requires 50 mA x 0.5 msec from linac at 400 MeV
o New ion source
o New RFQo Upgrade to RCS injection/painting bump magnet power supplieso Improved painting schemeso New injection collimation systemso New diagnostics and corrector magnetso 12 rf stationso Plan supported by extensive studies and simulationso The ATAC finds the presented plan credible•

Plan under development for improvement of MR fast extraction to 750 kW
o Reliant on RCS operations at 600 kW
o Requires upgrade of collimator capacity in 3-50 BT (done) and MR (450 -> 2000 W)
o New scenario based on decreased cycle time (1.2 sec)o Higher gradient rf cavitieso New dipole/quadrupole power supply systems
o Anticipated performance in 2014 is 430 kW, based on 2.2 sec cycle time (requires partial
replacement with new power supplies)o The required power supply upgrade to support 750 kW operations may not be available
for several years latero The ATAC notes inconsistency in presentation of future projections, some of whichdisplay 750 kW by the end of 2014, and current planning which provides 430 kW in 2014o The ATAC believes that the development of strategies for reducing the MR cycle time isa necessary investment to reach 750 kW and should be continued.
o However, the MR plan presented is not sufficiently developed to be deemed “credible”.
R1: The plan for achieving MR operations at 750 kW should be further developed. Whiledecreased cycle times should be part of the plan, other options or additions, for example
operations at energies higher than 30 GeV or stacking of more than four RCS pulses in the MRshould also be explored.

•

Concepts have been identified for improvement of MR slow extraction to 100 kW by 2014o Ti chamber to reduce residual activationo Improved power supply regulation (<2×10-6 ripple)o New SX collimatorso Transverse (noise) kicker
o The ATAC does not feel a self-consistent plan, supported by simulations and beam
experiments, exists for slow extraction of 100 kW beams
R2: Develop a strategy for achieving slow extracted beam powers approaching 100 kW that is
supported by simulations. The strategy should take into account all known intensity dependent31

effects, incorporate comparison with beam experiments, as possible, and accommodate losses
up to a few kW in the extraction region.
•

An operations plan for the period through 2014 has been developed that contains:o Estimates of peak performance in the RCS and MR by yearo Estimates of the integrated beam power delivered from the RCS and MR by yearo Estimates of the integrated hours of beam on target for users and accelerator studies byyear.
o Estimates of commissioning time required following the linac upgrade.
o Estimates of the expected availability by year.
o The plan includes input from the user community

Update the existing operations plan as new information becomes available•

Significant progress has been made at defining the basic configuration and operational parameters
for the period through 2014.
o Parameter tables need to be updated as operational or development activities indicate
the need for changes.
o Extrapolation from current conditions should be guided by simulations and machine
experiments.
R3: The operations plan should be augmented by a J-PARC-wide technical upgrade plan that
describes the configuration of the complex, associated performance goals through the upgrade
period, and ensures that the necessary resources are available.

Linac status

Primary achievements
•

•
•
•
•

Overall there is a marked transition from beam commissioning to beam operations. The linac
routinely provides ≥200-kW operation of the RCS and it is adequate to support RCS operation at
420 kW.
Significant increase of the linac availability compared to the previous years. The RFQ conditioning
is no longer the major driver for maintenance stoppage and the ion source replacement time has
been reduced from 3 to 2 days.
Development and test of the new scintillator-based BLM, which is not sensitive to X-rays.
Fabrication of the spare RFQ is complete.
Continued beam studies to provide high-quality, high-power beams for injection into the RCS.

Comments and recommendations•

Ion source can support extended runs up to 2 months; the maintenance time has been reduced to
2 days. Possibilities for further reduction of the maintenance time are being investigated.

32

•
•

The Linac team consistently records downtimes and analyzes possible causes. Troubleshooting of
the HVDC power supplies resulted in the development of technical modifications of the HVDC
system, which are being implemented.
There is a substantial improvement in the availability of the RFQ but the RFQ discharge problem isa relatively large contributor to beam downtime. So far the RFQ discharge rate does not appear to
be increasing, despite an increase in operational vacuum levels. However, it is unclear how thedischarge problem will scale with higher beam currents and full duty cycle.
R4: Consider testing RFQ operation at higher currents approaching the design values as soon as
possible (e.g. in beam study time if feasible), to identify any potential discharge issues early.
R5: Continue thorough investigation of the Linac trips related to SDTL and BLM. It is likely thatthese trips can be eliminated without significant investment of resources.

•

The status of the klystrons approaching their design lifetime is being constantly monitored. The
klystron efficiency has been observed to be decreasing, but there are no failures yet. There arespares available for about half the klystrons. The procurement of 4 klystrons per year is foreseen.
R6: Consider alternate klystron replacement options such as partial rebuilds of failed units.

•Work on redundancy of the Front End systems is being pursued. The copper parts of the spare
RFQ have been successfully brazed and low-level RF measurements of the RFQ assembly are being
performed. Main electrodynamics parameters of the RFQ (resonant frequency, field flatness,frequency separation of dipole modes) have been measured. To have a confidence in correctnessof the dipole mode tuning, it would be useful to measure frequencies of all modes as a function of
the end-tuner penetration and to apply bead-pull measurements for dipole modes. Consider how
the spare RFQ will be used after the high power RF tests.
R7: Build a test stand with ion source, LEBT and RFQ capability as soon as possible that would
allow developing the required confidence before installing the spare RFQ in the operational
machine. Such off-line beam tests of the spare RFQ can be combined with the development andtests of a high-intensity ion source and high intensity RFQ for the future upgrade.

••

Despite of limited time for the machine study the Linac team has performed several useful beamstudies. Quantitative beam loss measurements in the ACS upgrade area of the linac as a functionof the vacuum pressure in the upstream sections have been performed. These experiments clearly
demonstrate that an appreciable beam loss increase in the ACS area is caused by the stripping of
H-minus beam on residual gas. Important information on linac parameters and the bunch
longitudinal profile has been obtained by phase acceptance scan of the SDTL.
There is still an unexplained beam halo observed at the high-energy end of the linac. Beam studies
on the effectiveness of L3BT collimation should be done. Additional collimation is being
considered in the MEBT2 section of the linac.
R8: Consider implementation of scraping in the low energy region (MEBT-1).

•

The residual activation levels built up while supporting 200 kW operations are quite modest, andnot a concern at present. They do not appear to be a limitation for the immediate power ramp-up
plans.

33

3 GeV RCS, including operations after Linac upgrade

Primary achievements
•
•
•
•
•
•

Routine operation of the Rapid Cycling Synchrotron (RCS) at 200 kW.
Establishing a good understanding of beam loss issues at injection, including optimisation of foil
geometries.
Making important beam dynamics measurements at the equivalent of 400 kW with 180 MeV
injection.
Resolving problems with the connectors for the fast extraction kickers.
Demonstrating that except at the injection and collimation regions of the RCS induced
radioactivity in the machine structure is markedly low.
Demonstrating that after resolution of the extraction kicker connector problem the reliability of
the RCS has proved to be markedly good.

Comments, suggestions and recommendations•

Since November 2010 the RCS has run routinely at a beam power of 200 kW (with 17 mA in the
linac and a pulse length of 0.38 ms). It is likely that the RCS would have run at higher powers
except for worries over risks to the target (for which there is no spare) and over less than optimal
behaviour of the liquid hydrogen moderator due to the presence of trace amounts of frozen waterand hydrocarbons.

It would obviously be good to remove any perceived barrier to operation at increased
powers due to target and moderator worries — as funds, opportunities and user schedules
permit.
••

It is noticeable again from the absence of any mention of them that most of the RCS systems musthave run well, e.g. the main magnet power supplies and the high-power RF drivers, and thesesuccesses again deserve to be noted.
A good set of investigations of beam dynamics issues at injection has been made — involving
measurement, simulation, and foil configuration changes. These have resulted in theestablishment of a notably improved understanding of the behaviour of the beam at injection, andhave pointed the way towards installation of an improved collimation system to further reduce
localised beam losses.
R9: Machine schedules should be arranged so that sufficient time is made available for asustainable machine development and study program.

Measurements of beam profiles and time dependences of foil losses could usefully becompared with simulations.
34

•

Linac beam halo may be contributing to beam losses at RCS injection. However, in practice there
may be a reluctance to use the L3BT collimation system for fear of activation caused by overly
thick stripper foils.
R10: Study the optimum operational balance between scraping off beam in the L3BT
collimators versus the collimators in the RCS. The exercise could include varying the thicknessesof the collimation foils.

•

Measurements have been made, at higher beam power, of the beam transmission through the
RCS for different painting configurations. For the equivalent of 400 kW with 180 MeV injection it
has been shown that the powers deposited in the RCS collimators are well within their ratings.
R11: Similar measurements should be made with as high a repetition rate as possible.

As powers deposited in collimators increase, it would make sense to consider procuring
entire replacement collimator assemblies so that in the event of failure a whole assembly
could be replaced without incurring a significant radiation dose to personnel.
•

Simulations for 1 MW with 400 MeV injection have been carried out (50 mA, 0.50 ms, 0.56 beam
chopper duty factor). These suggest that beam losses on the RCS collimator could be increased inorder to reduce more troublesome beam losses between the RCS and the main ring (MR) with its
54π-mm-mrad acceptance (lower than the acceptance of the RCS by a factor 6), although it isrecognised that extensive further work on injection into the MR is necessary.

Continue work on reducing beam halo to facilitate sustainable injection into the MR.
•

•

•
•

Substantial work has been carried out on schemes for upgrading RCS hardware to accommodate
injection at 400 MeV. On the basis of the beam dynamics and particle tracking studies carried out
so far, the schemes look good. The resources required to carry out the schemes are considerable,
however, and efforts should be made to ensure that the resources required would indeed beavailable.
It is noted that in moving towards operation of the RCS at 1 MW it is likely that a method for
reducing kicker impedances will have to be developed, and that a bunch-by-bunch feedback
system for the RCS will become necessary. It is also noted that in moving towards 1 MW attention
is likely to have to be paid by accelerator staff to the problem of optimising beam spot sizes andshapes on the neutron-producing target.
The RCS team should be congratulated on a successful programme to resolve problems with theconnectors for the fast extraction kickers.
The levels of induced radioactivity in the RCS away from the injection and collimation regions are
sufficiently low that they will not prevent operation of the RCS at higher beam power.

Main Ring, including operations after Linac upgrade

GeneralRapid start of user experiments after establishing of stable LINAC operation was achieved, althoughsome key equipment required modifications and improvements to increase the performance of the35

facility. Up to now the neutrino experiment using fast extraction with a maximum beam power of 135
kW and the hadron experiments using slow extraction with a beam power up to 3kW have run for 6 and2 months, respectively.

J-PARC is to be congratulated that the MR is already providing physics output from both the neutrino
experiment and the hadron experiments. It is also noteworthy that more than half of the users comefrom outside Japan, demonstrating that J-PARC is a truly international research facility.

Scheme to Realize Proposed Power at MR
A possible scenario to provide 0.75 MW beam power from the MR was proposed requiring an increased
MR repetition rate of 0.8 Hz. The increase of the MR repetition rate is required by the lower than
expected limit for the MR circulating beam intensity. 8 bunches out of 60 bunches from the RCS aretransferred to the MR with a total beam power of 75 kW taking into account the 3.5 % beam loss of at
the 3-50 BT collimator. Accelerating to 30 GeV then realizes the beam power of 0.75 MW for fast
extraction to the neutrino experiment. The planned RCS simulation studies including space charge
effects to evaluate the beam loss for the case of dynamic collimation with the use of local bump shouldbe pursued.

Slow Beam Extraction
Slow extracted beam has been provided to experimenters with a beam power of up to 3 kW althoughdemonstration up to 10kW was made. The extraction efficiency for the 3 kW operation is a world
record 99.5 %. The duty factor of the beam, however, was 3.6 % reflecting the big ripple in the excitation
currents of the magnets. The duty factor has been improved to 17 % by additionally short-circuiting trim
coils and to 30% with further additional application of transverse 20 MHz RF to increase the beamemittance. Application of transverse RF, however, is suffering from multipacting, which will be
mitigated with a solenoid field. To reach a high duty factor for slow extraction the current ripple of themain power supplies has to be reduced by orders of magnitude. This is unlikely to occur by 2014.

The position of collimators may need to be adjusted to avoid beam loss during the last three turns
before extraction.

R12: Schedule sufficient beam time for machine studies in the MR.

36

Linac energy upgrade

Primary achievements
•
•
•
•
•

The series production of the ACS modules has been started, 4 units have been finished already.
The fabrication capacity is one module per month. The klystron production is on schedule.
One out of these four modules was successfully power tested; shunt impedance is above design.
Installations for linac upgrade have started in 2010 summer shutdown and will be continued
during summer shutdown of 2011 (3 months). It was deduced from simulations, that no cavities
can be installed in advance, as they would increase the energy spread above RCS injection needs.
Beam simulations along the linac from RFQ exit to RCS injection were done, including alignmentand setting errors.
For the intensity upgrade a SNS type rf driven source plasma generator will be tested at JPARC,
involving cesium. A RFQ3 design for 60 mA (50 mA) beam current is underway.

Comments and recommendations
•
•
•
•
•
•

The linac energy upgrade is progressing very well. No showstoppers have been seen so far. The
planning and time schedules are convincing.
Recommendation R30i from ATAC10 should be included during the power testing of ACS modules,
to assure that neighboring modes will not be a danger at all power levels.
Detailed beam simulations including alignment and setting errors were presented. In future theRFQ should also be included.
The intensity upgrade is still in the design phase. It is quite behind of the energy upgrade.
The choice of using the SNS source plasma generator will not necessarily lead to a 60 mA H- source.
Cesium will be needed now and vacuum conditions down along the LEBT have to be checked to
get no cesium contamination of the RFQ.
The physics design of the high-current RFQ3 is not yet finalized. The proposed design may require
additional studies. The design shows a pronounced voltage ramping by more then a factor of two.
It is not clear why such a novel design is needed for the still modest design current of 50 mA. Of
particular concern is the reduction of the focusing strength at the end of the RFQ, which may
result in excessive tune depression and emittance growth due to the space charge of the bunchedbeam. In addition, a longer RFQ resonator should be considered to reduce peak surface field. A
longer RFQ will require appropriate techniques to control the dipole modes.
R13: Consider decoupling the energy upgrade from the intensity upgrade. The front end might
still need more R&D than is presently scheduled before construction of components should start.

Beam studies from source to RCS injection including all upgrades should be continued.

Ring RF, including high gradient cavity

37

Findings

General:Eleven cavities are operational in the RCS (12 after the Summer 2012 shutdown) and 6 in the MR (8 after
the Summer 2011 shutdown). The RF systems give satisfaction in both rings and do not detrimentally
impact on accelerators’ performance. The number of major faults during the last 12 months was limited(9 in the RCS and 7 in the MR) and they mostly concerned the electronics. The cavities did not contributeto the down time of the accelerators, although (because?) they remain under close monitoring.

RCS cavities
Buckling is a pending issue for the RCS cavities equipped with uncut cores. “Type C” coating has been
identified as a solution, and systematic replacement of the cores of all RCS cavities is in progress at therate of approximately 2 cavities per year, finishing during the summer 2013. The non-modified cavities
equipped with other types of cores still suffer from this phenomenon (e.g. cavity # 1 operating now with
2 gaps whose cores will be replaced during the summer 2011).

MR cavities
A 6th RF station has been installed as foreseen during the summer 2010.
The latent problem is corrosion at the cut. (e.g. cavity # 5 is operating with 2 gaps because of impedance
reduction: cores will be replaced during the Summer 2011).
As a remedy, Silica coating has been applied to cavities # 3, 4 and 6 in November 2010. In the case ofcavity # 2, treated also in November 2010, this has been combined with the installation of an RTV rubber
shield to avoid circulation of water in the cut.
All cavities will be Silica coated after the summer 2011, with RTV in cavities # 1, 2 and 5.
The impedances of cavities # 6 and 3 show a slight decrease. No conclusive explanation exists. It is
tentatively attributed to the fact that these cavities have already suffered from some damage, which
was recovered by polishing.

As a matter of precaution, the cooling circuit of the cavities will be isolated from the magnets during thesummer 2011.

38

Beam commissioning
A second harmonic RF voltage is used for longitudinal painting at injection in the RCS since 2009. In 2010it has been successfully applied before ejection in the RCS and at injection in the MR to improve thebunching factor.

Feed forward beam loading compensation on harmonics 2 and 4 has been successfully implemented on
the 11 RCS cavities, reducing by more than an order of magnitude the equivalent impedance of thecavity for the beam. This technique will be extended to the MR during the JFY2011.

R & D for future cavities
The R & D for future cavities progresses on two fronts:•

A core module made up of three concentric rings (to remove thermal stress and eliminate
buckling) in a chemically inert cooling fluid (to get rid of corrosion in water) has been tested athigh continuous RF power (up to 10 kW). RF and thermal measurements fit very satisfyingly withcomputations, leading to the need of 83 l/min of “Fluorinert” for a heat transfer coefficient of 750
W/m2/K. The next step is to construct a one gap resonator equipped with 6 core modules and totest it with a 60 kW RF amplifier.

•A new technique of production of the MA core is being developed to reduce heat dissipation andincrease impedance. Based on the use of a thinner ribbon annealed in the presence of an axial
magnetic field, a prototype of such an “FT3L” core has been measured as having twice theimpedance of a classical “FT3M” core of the same size. Using the same RF power, a 2 m long cavity
with 4 gaps and 6 FT3L cores/gap, would provide 60 kV instead of 40 kV in the present FT3M
equipped cavities. Cooling could be done by water, air or Fluorinert. A set-up is being assembled in
the J-PARC Hadron Hall for producing 20 MR-type cores and 2 RCS-type cores before the summer
2011. A single gap cavity could be installed in the MR during the summer 2011.

Comments & recommendations

Present RF systems
Important efforts continue to be made for addressing the remaining imperfection of the MA-loaded
cavities. The satisfying operational result of the accelerator complex shows that it is worthwhile.
Moreover, there are reasons to believe that long-term solutions have now been found. It will
unfortunately take a few years to get a convincing proof.
39

The Committee is concerned about the persistent reduction of impedance of certain MR
cavities. This confirms the need to continue the systematic monitoring of the cavities
characteristics.
The excellent performance of the feed forward beam loading compensation on the RCS cavities and theobserved beneficial effect of a second harmonic RF in the RCS and in the MR to increase the bunching
factor are very encouraging for the future operation at much higher beam power.

The Committee congratulates the RF team for these remarkable results and encourages
their publication.
R & D for future cavities
FT3L based cavities are a potential solution for getting, within the available straight sections, the RF
voltage required by the MR for delivering a beam power of 0.75 MW.

The Committee is impressed by the progress of this development and fully supports its
continuation.
Concerning the cooling fluid, a lot of experience has been gained with water, which is used in all
installed RF systems at JPARC. It is possible that long-term solutions have now been found, but thedemonstration will take many years. The investigation of other cooling fluids is therefore worth
continuing, as a back-up solution for future cavities. Similarly, multi ring cores could become an
attractive option if experience shows that “Type C” coating does not fully avoid buckling.

The Committee acknowledges the quality of the work accomplished and supports thecontinuation of the development of the single gap cavity equipped with multi ring coremodules and using Fluorinert cooling. This development is performed by a group separate
from the J-PARC rf group. The Committee acknowledges the existence of regularcommunication between the two rf development teams and encourages its enhancement,
which could develop into a joint proposal for a future prototype.
(R14 was converted to a comment)

R15: Before starting to build a multi-gap cavity using air or Fluorinert cooling, a complete engineering
design should be made describing, in detail, cost, the infrastructure needs (space, electricity, water,air…), the maintenance requirements and the compatibility with safety rules in confined areas.

MR power supply upgrade

Primary Achievements

40

The present MR magnet power supplies operates with cycle periods of ~ 3.2 sec and ripple amplitudesof ~ 10-4. These pose limitations on the available power for FX and SX. The nominal 750 kW FX scenario
requires ~ 1.2 sec cycle time and ripple magnitudes ~10-6 for SX operation

Investigations of the present MR power supply system show only marginal possible reductions of thecycle time from 3.2 to 2.6 sec, without sacrificing control further. Ripple reduction prospects of thepresent system power supply include:••

Shorted trim coils, which are effective in the flattop region, but only provide about 10 times
reduction, whereas the SX requirements are ~ 100
Feedback cancelation, which are effective throughout the cycle (appropriate for FX), but only
provide ~ 1/3 ripple reduction, as compared to a factor of 30 needed.

These improvements are not sufficient for a long-term solution.

A new MR PS system is proposed that would:

1. Reduce the number of magnets per power supply to reduce the inductive load
2. Use an IGBT technology
3. Use a capacitor based energy storage scheme
Simulations of the system look promising to meet the requirements, but the design is only conceptual.

Comments and Recommendations

The power supply ripple and cycle time requirements should be clearly specified for the designers,
based on beam and overall operational power scenario considerations.

While promising, the new proposed IGBT power supply with capacitive energy storage is quite
conceptual at present. There are possible issues with increased space requirements, additional cabling
requirements, uncertain component lifetimes, and overall development time. It is not obvious that this
proposal is the best solution, as it was the only one presented to the committee. Before initiating such a41

major upgrade a comparison should be done with the more conventional option of flywheel energy
storage and separate high voltage ramp and low voltage flattop power supplies. The proposed solutions
should be reviewed by an appropriate panel of experts.

While detailed planning has not yet evolved for the deployment of the new power supply, the prototype
testing and initial installation should protect the reliability of operations. Limited testing time of a single
prototype may not provide adequate reliability data.

Consider initial deployment of this technology in a manner that would allow “roll-back” tothe old power supply if there were unforeseen issues. This could be accomplished with anindividual quadrupole family power supply, which would not need re-cabling.

Impedance, instabilities and controls

Primary Achievements
•
•
•

•
•

A single-shot beam with intensity corresponding to 420kW beam power if the repetition rate were
25Hz was achieved in the RCS. In this mode, measured beam intensity reduction is 0.5%, and no
beam instability was observed.
At the 420kW-equivalent intensity, instabilities were observed in the horizontal direction at times
more than 10ms after the injection if the chromaticities were corrected.
An operational scenario was proposed simultaneously meeting power requirements on the RCS
and MR without exceeding RCS and 3-50BT collimator limit of 4 kW. This scenario required tune
manipulation in the RCS with quadrupole correctors and effective reduction of RCS collimator
acceptance with a dynamic bump.
The horizontal damper reduced the beam loss at injection energy in the MR when 8 bunches were
injected at the intensity corresponding to 135 kW at 30 GeV.
Transverse broad-band beam break-up instabilities were observed with the 135kW-equivalentbeam in the MR. The instability frequency extended up to 40 – 70 MHz.

42

Comments and recommendations:•

The committee commends the efforts in pursuing 420kW-equivalent beam study in the RCS, andbeam studies to define the path towards 1 MW beam power in the RCS and 0.75 MW beam powerin the MR under realistic operational conditions and collimation constraints. The plan to increase
the time of machine studies from the present 20 days to 50 days per year can significantly
enhance the understanding of the beam dynamics and accelerator systems performance. Present
beam loss studies and computer simulation comparisons indicate that beam dynamics of spacecharge and phase space painting is relatively well understood. More systematic studies areneeded in understanding the nature of collective instabilities and impedance sources including
possible electron cloud effects.
R16: Perform more systematic studies in understanding the nature of collective instabilities and
impedance sources, and develop mitigation plans accordingly.

•

The committee commends the efforts in significantly enhancing beam diagnostics including fast
beam loss measurements, high-frequency beam position measurements, fast transverse beamprofile measurements, and longitudinal wall-current-monitor measurements. Understanding andcontrol of transverse beam profile in the RCS is crucial in optimizing beam phase-space
manipulation to meet various design requirements under operational conditions and constraints.
R17: Further enhance beam diagnostics and analysis capabilities, in particular beam profile
measurements in the RCS and 3-50BT.

•

Kickers are identified as major sources of beam coupling impedance. Test stands are available foroff-line R&D. We encourage the project teams to pursue more systematic measurements andanalysis including both longitudinal and transverse impedance measurements, and kicker
performance calibration including rise time and flattop flatness under various kicker and power
supply network design optimization scenarios. Similar efforts on the SNS ring extraction andinjection kickers may be referenced.
R18: Pursue more systematic measurements and analysis including both longitudinal andtransverse impedance measurements, and kicker performance calibration including rise timeand flattop flatness under various kicker and power supply network design optimization
scenarios.

•

Instabilities were observed in the MR at relatively low beam intensities. Instability behaviors weresimilar to those at many other high intensity accelerators. Chromaticity maneuver and bunch-tobunch dampers may not be adequate to mitigate the effects.
R19: Consider more instability damping measures including using octupole magnets andmomentum broadening rf cavities in the MR.

•

Maneuver of the transverse tunes along the ramping cycle of the RCS was identified as one of the
key procedures to meet design requirements. We encourage actual implementation of ramping
quadrupole correctors both to manipulate the tunes and to correct the β-function beating. We
also encourage resonance correction with nonlinear correctors.
R20: Consider implementation of ramping quadrupole correctors in the RCS for tune maneuverand β-beating correction. Evaluate benefits of nonlinear correctors.

43Appendix: Meeting Agenda

Thursday 17 February 2011

09:20 Project Status

NAGAMIYA, Shoji

10:00 Accelerator Overview

ANDO, Ainosuke

Status & Commissioning (Linac)
11:30 Linac Status (00h30')

HASEGAWA, K.

12:00 Beam Study Results of Linac (00h30')

IKEGAMI, M.

Status & Commissioning (RCS)
13:30 RCS Status (00h30')

M. KINSHO

14:00 High Power Study of RCS (00h30')

H. HOTCHI

14:30 Beam Loss in RCS (00h30')

K. YAMAMOTO

Status & Commissioning (MR)
15:20 MR Status and Beam Study Results (00h40')

KOSEKI, Tadashi

16:00 MR Slow Extraction (00h30')

M. TOMIZAWA

Friday 18 February 2011

Status & Commissioning (MR)(contd.)
08:40 Instability: Observation and Study Results of MR (00h30')

TOYAMA, Takeshi

44

Ring RF
09:10 Ring RF Status (00h40')

YOSHII, Masahito

09:50 Alternative Solution (00h30')

MORITA, Y

Towards 1MW RCS and 0.75MW MR-FX with Linac Energy Upgrade
10:40 Schedule & Commissioning of Linac Upgrade (00h30')

N. OUCHI

11:10 RCS with 400MeV Injection (00h30')

N. HAYASHI

11:40 MR-FX 0.75MW Scenario (00h20')

IGARASHI, Susumu

Towards 1MW RCS and 0.75MW MR-FX with Linac Energy Upgrade
13:00 MR Power Supply at Present (00h30')

S. NAKAMURA

13:30 MR Power Supply in the Next Step (00h30')

Y. KURIMOTO

14:00 High Gradient RF Cavity (00h30')

C. OHMORI

14:30 Instability: Dynamics of High Intensity Beam (00h30')

Y. SHOBUDA

Saturday 19 February 2011

11:00 Report to project team

T. ROSER

45