Minutes of the 36th MT Committee Meeting
Date and time: September 17, 2010; 13:30–15:00
Place: Nishina Bldg., Room 201
Attendees: Sakai (Chair), Fukunishi, Kambara, Kase, Kubo, Kubono (CNS), Otsu (in Sakurai’s place),
Shimoura (CNS), Ueno, Wakasugi, En’yo (observer), Uesaka (UEC observer)
Absent: Kamigaito, Morita, Sakurai, Uwamino, Motobayashi (observer), Yoshida (observer)(no particular order)

Reports
1. Beam-time schedule changesz

The NP0702-LINAC12 (Morita) beam times (BTs) were allocated on Sep. 5-21 and Sep. 5 – Oct. 22.
Also, the 238U commissioning was allocated on Sep. 24-26 (1.5 days). In addition to these allocations,the original BT schedule was modified as follows.

z¾

ML0901-LINAC18 (Kudo, 9/10/21:00-9/13/9:00) was cancelled.

¾

IB0702-RRC01 (Abe) & ML0901-RRC20 (Izumi) were shifted to the following day.

The CNS director requested to extend the A19 (CNS2005-4)-2-3 (Kahl) BT by 0.5 days. The MT
Committee chair decided to accept the request.

2. BigRIPS vacuum troublez

As reported in the previous meeting, BT NP0906-RIBF16 (Kobayashi) was canceled due to vacuum
trouble at STQ1-D1 of BigRIPS, which could not be repaired immediately. It was reported that theprimary beam hit a duct around STQ1-D1so that a rubber O-ring used there was damaged by theheat or radiation induced by secondary particles produced.

z

In the coming BigRIPS-based experiment series, a radiation-resistant rubber O-ring will be installed,which will further be replaced with a pillow-seal system next summer.

z

It was pointed out that if the total beam-current integration of the coming 48Ca series is extremely
high, the installation of the pillow-seal system will be affected due to residual activity. In this event,the MT Committee chair will ask spokespersons to restrict the beam intensity.

3. Distribution of the minutes of MT committee meetingz

In addition to the distribution of draft versions of minutes via email, approved minutes have been
also posted at the web site:
http://www.nishina.riken.jp/UsersGuide/MT_Committee/meeting_minutes.html.

4. Status of the PAC meetingsz

NP-PAC: 8th NP-PAC will be held on Dec. 3-4 (or 5).
¾A tentative 8th NP-PAC schedule was announced on Aug. 13; it was also announced that we will
start to accept “proposal updates” in addition to the usual proposals.

¾

The call-for-proposals was distributed on Sep. 10. (The submission deadline is Oct. 8.) Prior to
the pre-review by NP-PAC, technical issues will be reviewed by the equipment contact persons
on Oct. 12-19. The reports will be sent to the NP-PAC and spokespersons.

¾SAMURAI will be made available to use in experiments and will be included in thecall-for-proposals of the 9th NP-PAC (next to 8th NP-PAC). SCRIT will also be made available
when it is ready to accept users.

zz

ML-PAC:¾

6th ML-PAC report was approved by RNC director. The result was sent to spokespersons.

¾

7th ML-PAC will be held on Jan. 11-12, 2011.

In-PAC (Industrial Program Advisory Committee):¾

2nd In-PAC report was approved by RNC director. The result was sent to spokespersons.

5. Other reportsz STQ24 was set up as a SHARAQ beam line.
z Although the lease time was expired on the end of September, 2010, the Kappa magnet is still placed†at RIBF. Details are under discussion .

Discussions
1. The minutes of the 35th meeting were approved.
2. Detector Development Beam Time (DDBT)zThe following two proposals were submitted to the call for DDBT open Jul. 19 – Aug. 1. It was
decided to approve both of them. The priority of their BT allocation should be, however, lower thanfor PAC-approved experiments.
¾“Study of beam transport and background with a newly installed apparatus for student
education” by Ota et al., CNS, the University of Tokyo (A 0.5-day BT was requested for theuse of α beam at E/A=6.5 MeV with I=10 pnA at the E7B course).

¾“Development of diamond detector” by Michimasa et al., CNS, the University of Tokyo (A2.0-day BT was requested for the use of α beam at E/A=8.8 MeV with I=10 pnA at the E7Bcourse).

z

The MT Committee requests a short presentation to spokespersons in the next DDBT call.

3. Coming second half-year BT allocationz

Call for BT scheduling requests was open Jul. 19 – Aug. 1 for experiments which use RILAC, AVF,and RRC. A proposed BT plan, arranged by a WG consisting of MT Committee members, wasapproved. That for BigRIPS-related experiments was already approved by the 34th MT Committee
meeting. Since this BT schedule is very tight, an announcement will be issued by the MT Committee
chair that BT schedule changes will not be possible in most cases, even when problems occur withthe beam line.

zAlthough the construction and commissioning of RILAC-II will not be completed by Nov., 2010, thenext BT-scheduling requests will be for BigRIPS-based experiments in a similar manner to the firsthalf-year BT allocation procedure. We also need to develop measures against the case that the124

Xe-beam development is not completed, where the RNC deputy director takes a central role. In† There was an error in the minutes of 36th MT Committee Meeting distributed on Oct 13. We would like to correct this error andapologize for any trouble this may have caused.

any case, the development of Xe and U beams will be carried out in this order as announced.
zThe ion source associated with each experiment will be also indicated in the next BT table.

4. Request for the BigRIPS parasite BT allocationz

It was requested to allocate a BT of NP0702-RIBF11 (Nishimura) during the coming 48Ca BigRIPS
series as a parasite experiment. The MT Committee approves this request if two conditions are met:i) NP0702-RIBF11 gains approval from main experimental groups and ii) NP0702-RIBF11 isregarded as a completed BT.

5. Ion-source use for PAC-approved experimentsz

Except for the ion-source materials used in core business beams such as 48Ca, 124Xe, 238U, etc., users
are requested to prepare ion-source material by themselves.

z

To avoid troubles in advance, this issue will be checked in the technical review initiated by theproposal submission. If users need to prepare their own ion-source material, the principal
investigator should be informed.

6. Next MT Committee meetingz

The next MT Committee meeting will be held on Friday, October 15, 2010, from 13:30 to 15:00.