TITLE

J-PARC Accelerator Overview
ProgressStatus

Yoshishige Yamazaki
for J-PARC Accelerator Group
KEK-PS External Review 2004
KEK, Tsukuba, June 7th to 8th, 2004

OutlineIntroduction
 Linac Status and The Beam Test of the Front End
Linac
 3-GeV Rapid-Cycling Synchrotoron (RCS) Status 50-GeV MR Status
 Beam Dynamic Study and Issues
 SummaryIntoduction

Site View of the Project
MaterialsandLifeScience（１３０ｍ７０ｍ１４ｍ）

NuclearandParticle
Physics（１００ｍ８０ｍ１９ｍ）

NuclearWaste
Transmutation

NeutrinoProduction

Lniac(350m)

Phase I

3GeVRCS（300m）

50GeVSynchrotron(1500m)Phase II

Intoduction

Present Status of the J-PARC

December 2003
By Kazuhiro Tanaka

Intoduction

Revised Construction Schedule

By Shoji Nagamiya

Linac Status

Linac Scheme

Accelerated particles:
Energy:Peak current:
Repetition:

H181 MeV (400 MeV for ACS, 600 MeV for SCC)
30 mA (50 mA@ 400 MeV for 1MW at 3GeV)
25 Hz (additional 25 Hz for ADS application)

250m

Ion
SourceTo RCS(3.1m) (3.0m) (27.1m)(91.2m)(15.1m)(109.3m)

RFQ

SDTL

DTL(324MHz)

50 keV

3 MeV

50.1 MeVACS(58m)(972MHz)SCC

190.8 MeV

400 MeVBlock Diagram of the Linac

ToADS
600 MeVLinac Status

Schedule

The commissioning schedule will be 0.5 year behind the original schedule,
although the budget profile will be extended by 1 year.
Key Dates•April, 2005 Start installation for main components•Sept., 2006 Start linac beam test
•May, 2007 Start RCS beam test
JFY 2003(H15) 2004(H16) 2005(H17) 2006(H18) 2007(H19)
Beam Test Cooling, Preparation

Linac DTL Beam Test at KEK

Construction

Building, Utilities
Linac Components

Fabrication, Test

Transfer to Tokai
Installation, CommissioningLLRF
Klystron: Test and Installation
RFQ,DTL,SDTL Installation
Final Alignment
Conditioning
Beam Test

Beam Test

Beam Test

RCS Beam Test

March, 2004

Linac Status

Wave Forms of Chopped Beam

Linac Status

Measured emittances

Simulation results(IMPACT by LBNL)

Emittance Comparison at MEBT

Linac Status

Profile Measurement and Simulation

Linac Status

Status of DTL and SDTL

Parameters of the DTL and the SDTL
EnergyFrequncy
Section Length
Accelerating Field, E0
Number of Cavities

DTL
3-50
324
27.1
2.5-2.9
3SDTL
50-190.8
324
91.2
2.5-3.7
32

MeVMHzm
MV/mStatus•DTL– Beam test of the #1 cavity has been carried out.
– Assembling of the #2 and the #3 cavities has been completed.
•SDTL: Fabrication of 22 cavities out of 32 has already been
completed.

Drift-Tube Linac (DTL)

Linac Status

Inside of DTL

集束コイル

出力管

電子
銃

RFQ

Beam Test: 6 mA (20 MeV ) on Oct. 30, 03
30 mA on Nov. 7, 03

Linac Status TRACE3D Simulation and the Beam Test Results
BEAM AT NEL1=3
H A= -1.2187
B= 0.13174
V A= 2.1885
B= 0.22344

3.000 mm

XZ A=-8.00000E-02

30.000 mradB= 0.63291

30.000 Deg
X
90.00 keV
NP1=
310.00 mm (Horiz)
60.0 Deg (Long.)
25.00 mm (Centroid)I=
30.0mAW=
3.000019.7156 MeV
FREQ= 324.00MHz
WL= 925.29mm
EMITI= 15.655
12.538422.00EMITO=
6.112
4.883
436.54N1=
3
N2= 429PRINTOUT VALUES
PP PE
VALUE
1 140.14626
1 35
15.73077
1 46-35.40800
1 58
17.87880
1 79
0.15955
1 100
23.56530
1 111
58.54500
1 123
26.68800
1 141
55.48776
1 158
31.97720
MATCHING TYPE = 9DESIRED VALUES (BEAMF)
alphabetax0.0129
0.5898y0.05020.2895z-0.0892
0.3565
MATCH VARIABLES (NC=6)
MPP MPE
VALUE
127-8.99000
13415.73077
138-17.48234
1439.38879
1140.14626
1310.14007
CODE: TRACE3D v67LY
FILE: jpl_m1dp1_pmq_1.t3d
DATE: 10/22/2003
TIME: 12:43:40

BEAM AT NEL2= 429
H A= -6.6396
B= 23.512
V A= -7.6207
B= 24.127

3.000 mm
Z A=30.000 Deg

PMQ
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GPMQ
PMQ
G345678109111213141516171819 20 212223242526
27282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949510096
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428

-25.00 mm (Centroid)
10.00 mm (Vert)

X

30.000 mrad

7.3022

B=X

1.192790.00 keV
NP2= 429

429

Length= 16358.46mm

Q magnet excitation currents in theMEBT(8) and in the DTL(77) aredetermined by the TRACE-3Destimation. All the Q magnets areexcited in DC mode.
Beam transmission ratio of 100% has
been successfully achieved with noadjustments of the Q magnet currents.

Waveforms at the entrance of theDTL(a) and at the exit of theDTL(b).

Linac Status

Status of the DTL#2,#3 Cavities

Assembling of the #2 and the #3 cavities has beencompleted. Low level tuning is underway.

Installation of the drift tubes in the cavity.

Linac Status

Status of the SDTL Cavities

Fabrication of 22 cavities out of 32 has already been completed as planned.
Fabrication will be finished by this October. The next major step is assembling.

Some of the cavities are stored at
KEK. (Feb. 25, 2004)

Some cavities are under electroforming process. (Feb. 26, 2004)

Linac Status

Linac Building

Cross sectional view at the SDTL
part
Plan view of the linac building（W:47.5m、L:330m、H:15.3m）

Linac tunnel (floor level -13.5m),
sub- tunnel, klystron gallery, rooms
for power supply and cooling watersystem.

Linac Status

Upstream part of the linac tunnel(Jan. 23, 2004)

Status of the Linac Building

Downstream part of the linactunnel (Jan. 23, 2004)

RCS Status

Layout and characteristic parameters

ToUsers

From
Linacbeam parameters
injection energy
extraction energy
repetition rate
harmonics
output power

400 MeV
3.0 GeV
25 Hz
21.0 MWlattice parameters
circumference
348.333 mcell structure(6 FODO arc+ 3 FODO insertion)
3nominal tune
(6.72, 6.35)
natural chromaticity(- 8.5, - 8.8)transition γ
9.14
momentum compaction 0.012

Schedule

RCS Status2001 F.Y.
Budget ▼Building

2002

2003

2004

2005

2006

2007

2008

Design Start▼Building Budget Start▼Completion▼1st Machine Budget Start (4 years)▼Completion▼2nd Machine Budget Start (4 years)
M i l e - ▼MachineStone▼Completion

Design▼Machine Spec. Confirmation▼Building Design▼Building Start▼Completion▼1st Machine Manufacturing Start▼2nd Machine Manufacturing Start▼Equipment Install Start▼Machine Install Start▼Overall Test Start▼Beam Commissioning
MR Beam Commissionig▼
User time (?)▼

2009

RCS Status


Overview of Machine Status

Main magnet and Power supply– The construction of dipole and quadrupole magnets was started in 2003. The
sextupole and steering magnets have been designed and ordered.
– The choke coils and capacitor array for the power supplies are under massproduction.

RF System– Almost all components are under construction (except for the driver amplifier).
– The high power test of the power supplies is on-going.

Vacuum System– The most part of components have been designed and ordered.
– We are testing the ceramics chamber for mass production.

Injection and Extraction System– The kicker magnets are under mass-production. The power supplies were justcompleted last year and improved a little.
– The septum, the bump and the collimator have been mostly designed and ordered.

Monitor and Control System–

The beam monitors and the control system have been designed and ordered.

RCS Status

Stranded Conductor
SUS cooling pipe
(inner diameter : 11 mm)

Impregnated coilwith polyimide resin(for rigidity, high heatconduction and rad-hard)

Stranded wires(Diameter:~3mm
Number:72)

Remark:

The temperature of polyimide resin and pressure of the tank areessential to the impregnation and the curing process.
Impregnation at ~90℃ and curing at 150℃~200℃
 cyclic process between vacuum and +2 atm in the tank forthe impregnation
RCS Status

Quadrupole Slit OptimizationExcitation current :Repetition: 28.2 Hz
DC current: 536 AAC current: 900 Aslit

60012640

96℃ 113℃

20100R165

Shape and slit configuration of the end plate

To reduce the temperature less than 100 ℃, we optimized
the number, the positions and the depth of slits further.

RCS Status

Simulation of Optimized Quadrupole

Maximum temperature: 95[℃]
Atmosphere : 30[℃]
End plate

20 slits at each end
plate and eachpole end

CoreAtmosphere in this area : 50[℃][ ℃]

Temperature Distribution of quadrupole magnet (1/16 region)

We successfully reduced the temperature less than 100 ℃.

RCS Status

Airpalet Photos

RCS Status

Injection and Extraction

The kicker, the bump and theseptum magnets are used for thebeam injection and the extraction.
Kicker magnet
Status : The eight kicker magnets areused for the beam extraction. Three ofthem are under construction.The
power supplies for the kicker werecompleted, and tested.
Specification

Kicker magnet

Gap height : 160 mm, Gap width : 280 mm, Charging voltage : 80kV,Impedance : 10Ω, Current : 4000A, Pulse width : 1.3 μs, risingtime for power supply : < 100ns

RCS Status Ceramics Vaccum Chamber for Quadrupole

Chamber Joint
to make long chamber ( > 3 m )with Metalizing & Grazing

RF Shield
to decrease the impedancecopper with electrotyping methods

D:260 mm, L:1200 mm, rf shield:100 lines


TiN Coating at inside
to reduce the secondary-electron emission
from surface

Ti Flange
to reduce radio-activation

Maximum diameter for QM:400 mm, Maximum length for DM:3300 mm

RCS Status

RF System R&D works (1/2)

1. High-gradient Magnetic Alloy loaded CavityStatus:The development using the test cavity whichis the direct water cooling of the MA core has
been done last year. The confirmation of the final
design is on-going.
Max. gap voltage of 43 kV
Direct cooling of the MA core
5 kW losses (ave.) / MA coreDirect cooling type MA cavity

2. Anode power supply

Status: The anode power supplies are underconstruction and the high power test of the first three
is on-going.
Max. output of 1.2 MW (13 kV, 92 A)

Switching type (~33 kHz) power supply by usingIGBTVery low ripple voltage of dV/V ~0.2 %, and low
sag of ~1 % for 25 Hz operation


Anode power supply

RCS Status

RF System R&D works (2/2)

3. Final stage RF power amplifier
Status: Final Amplifier has been already constructed,andhigh power test is on-going.


600 kW class tetrode (ex. TH558K) x 2
Wide frequency range (0.9~5.1 MHz for h=2~6)

4. Driver RF power amplifier

Status: We have constructed and tested two types of
the grid drive rf amplifier with the MOSFET. We will soon
decide the final design.

Final stage RF Amp

7 kW output
 Wide frequency range (also 0.9~5.1 MHz for h=2~6)
* High power test of RF system is on-going at thebuilding of HENDEL in JAERI-Tokai. The test-standwill be guided in tomorrow’s site tour.
Driver RF Amp

MR Status

Building, Tunnel

A,B tunnels: Jun 05

C2: Jun 05

D2: Jun, 05
M3: Jun, 05

M2: Jun, 05
C tunnel: Fall 05

D1: Spring, 06

D2: Spring, 06

D tunnel: Spring, 06

M1: Spring, 06

MR StatusTunnel Photos

MR Status

MR Magnets

produced # / total #Bending Magnets (BM)60/97
Quadrupole Magnets (QM)
60/216
Sextupole Magnets (SX)
24/72
Steering Magnets (ST)124/186•Flip-Flop coil for BM and data taking system
Harmonic coil for short QM and data taking systemhave been made and tested by measuring BM and QM fields•Mass measurements for BM and QM will soon startMR Status

B

Sextupole

MR Magnet Photos

QSteeringMR Status

Field Measurement Tools
Flip-Flop CoilRotating(Harmonic) Coil

MR Status
Bending
Quadrupole
Sextupole
Steering

Magnet Power Supply
6/6
0/11(completed next year)
3/3
186/186

Test of BM power supply (1-unit) by load of an R&D magnet•Ripples (spec. ≤ 1 10-6 p-p)
DC 201A (flat bottom)
DC 2186A (40GeV flat top)

≤ 1 10-6@all components (50Hz -higher)
2.5 10-6@1200Hz≤ 1 10-6@other components (50Hz-higher)•Tracking error (spec. ≤1 10-4)
40GeV pattern operation≤ 0.9 10-4--> More tuning will be performed for real conditionMR Status

BM Power Supply

22kV/2kV transformer

MR Status

RF System
total# 6

Cavityfrequency 3.34-3.44MHz (h=18)
cooling: direct water (gap 10mm)core coating:epoxy resin#1 ready#2 constructing (with cores)#3 constructing (without cores)
Anode Power Supply#1 ready#2 constructing
Final Amplifier#1 ready#2, #3 constructing
Driver Amplifier
design based on CERN type

MR Status

Cavity Inside View

RF Sysetem Photos

Anode Power Supply

Magnet-Alloy CoreMR Status

Vacuum SystemOutline•Chambers: SUS316L
electrolytic polish (E-P), pre-baking---> outgassing rate 1×10-8 Pa•m/s
vacuum pressure < 1×10-6 Pa•Gasket:HELICOFLEX delta type /quick clamp chains•Bellows: titanium with rf shield•Ceramic breaks are connected to bellows/pump ports
Status
•BM chambers /96: 15 finish and 25 in process ofwelding-assemble (transition and flanges)•QM+SX+ST chambers /~430: 98 ready, 132 E-P, 42 baking,•bellows: 300/~420 ready•Clamps: 290/~1700 ready, •gate valves: 18/18•seals: 10/~2200, •ion pumps 20/~130, •pump port : under design
Test
effect of stray field of BM and QM on pumps•Ion pump: slight decrease of pumping speed --> usable•TMP: serious heating by eddy current of rotating fins--> can not be pumped when BM and QM are operatedMR Status

Vacuum system Photos

Issue 1 Linac Energy Recovery Schedule Proposed
2003.2.18

LINAC 400 MeV Recovery Schedule
Shut DownOperation

The First YearThe 2-nd Year

The 3-rd YearThe 4-th Year

The 5-th Year

July,Aug.
Scheduled Operation

July-Sept.

July-Sept.

July-Sept.

July-Dec.
400MeV Commissioning

Distribution Step up

Electricity

Sep.-Dec.

Wiring
Cooling Water

Step up Work

Test Run
Device Control Program

Control

Wirig
Commissioning Program
ACS Assembly Test Area Set up
RF System Set up
ACS Cavity Production
ACS Cavity Assembly ,High Power Test
ACS+Q-Mag Assembly, Alignment
Q-Mag,Beam Monitor Production and Test
Set upKly.PS

WiringProduction

RF System

Set up ,Test
ACS System Test, Tuning (Occasional)
Beam Acceleration Test (If Possible)
TunnelWG Set up

Wiring,Piping
ACS Installation

Wiring,Piping
ACS Installation

Buncher(MEBT2) Installation

Wiring,Piping
ACS Installation

RFQ,Debuncher Replace
RF System Tuning
LINAC Commissioning
3GeVCommissioningIssue 1

Problems in Energy Recovery Scenario

Energy spread of the beam, passing through the idle detuned accelerating
structure (without transient effects)
Energy spread is 0.615 MeV at 2.04MeV
detuned, while it should be less than 0.4
MeV.
We have to give up the installation of the200-400 MeV high-energy structures on
beam line, detuned and being idle. .
The structures should be installed to thebeam line, just before the beamcommissioning.
This will increase the peiod of the beam shut down in the final year by one
month or more.

Issue 2

RCS Full tracking simulation

Dependence on macro particle number

Injection energy :181MeV
Painting type: Correlate
Beam Power: 0.6MW at Ext.
No error,realistic aperture

Survival rate[%]a few %

Violet: 1x106
Yellow: 5x105Dark green: 2x105

Over estimateBlue: 1x105

Light green: 5x104

Red: 2x104
injection

extraction

Time [sec]Issue 3

Injection Scheme to the 50 GeV MR
181MeV linac

400MeV linac

Injection time

560ms  120ms

RF frequency
Injection kicker flat top

3.34-3.44  1.67-1.72 MHz
130ns  900ns :longer PFN cable

Pulse bending magnet flat top
Injection kicker rise time

600ms  120ms :only pattern change
170ns  <300ns :no changeIssue 3

MR Acceleration Pattern and Beam Intensity

181MeV Linac case15batches/15bunches
30GeV slow extraction
40GeV fast extraction
0.7s
1.9s
0.87s
1.9s
0.87s
0.61s
0.61s
total 4.08s
beam current: f × 24µA
beam power: f × 0.73MW

total 3.38s
beam current: f × 29µA
beam power: f × 1.17MW•f~0.6 if beam loss by long injection is small•0.6 expected ratio of beam intensity per one bunch for 181MeV/400MeV cases

Issue 3

Time Evolution of Loss in MR

Green: COD = 0.5 mm
Blue: COD = 1 mm
Red: COD = 2 mm

SummaryIn general, the construction of the J-PARC accelerator is onschedule for starting the linac beam commissioning in mid-2006
and extracting the 40-GeV beam by the end of JFY2007.
The beam simulation for the long time period still takes too longtime to study the error effect and to improve the beam loss.
The further effort is necessary for reducing the shut down periodof the final year of the linac energy recovery, since the high-energy
structure cannot be located on beam line.