J-PARC Accelerator Status and Commissioning Plannuclpart.kek.jp/pac/0903/pdf/PAC_yoshioka.pdf · J-PARC Accelerator Status and Commissioning Plan PAC meeting, Masakazu Yoshioka (KEK),

JJ--PARC Accelerator Status and Commissioning PlanPARC Accelerator Status and Commissioning PlanPAC meeting, Masakazu Yoshioka (KEK), March 6, 2009PAC meeting, Masakazu Yoshioka (KEK), March 6, 2009

Recent milestones:Recent milestones:December 23, 2008: December 23, 2008:

30 GeV beam acceleration and fast extraction 30 GeV beam acceleration and fast extraction to the beam abort dumpto the beam abort dump

MLF user run (20kW)MLF user run (20kW)January 27, 2009:January 27, 2009:

Beam extraction to the Hadron Experimental hall Beam extraction to the Hadron Experimental hall using slow beam extraction systemusing slow beam extraction system

February 19, 2009:February 19, 2009:Government inspection for radiation safetyGovernment inspection for radiation safety

Beam commissioning has been accomplished Beam commissioning has been accomplished on schedule, BUT without space charge effect.on schedule, BUT without space charge effect.

We should understand its significance, We should understand its significance, BUT should not overestimate.BUT should not overestimate.

Real challenge toward the power frontier machine Real challenge toward the power frontier machine will start from now on.will start from now on.

We still have many We still have many issuesissues (unreliable components, design etc.) to be solved.(unreliable components, design etc.) to be solved.At the same time, we have to provide the At the same time, we have to provide the beam to usersbeam to users (It(It’’s a duty)s a duty)

(MLF, (MLF, HadronHadron, Neutrino)., Neutrino).Additionally, Additionally, power upgradepower upgrade should be also accomplished steadily. should be also accomplished steadily.

Personal Recognition of JPersonal Recognition of J--PARC PARC Accelerator SituationAccelerator Situation

Goal (Mission) and Issues for Goal (Mission) and Issues for 33--step Power Upgrade Scenariostep Power Upgrade Scenario

100kW100kW trial in JFY2009trial in JFY2009JFY2009 ScheduleJFY2009 ScheduleRCS status and plan for MLF user run (Michikazu Kinsho)RCS status and plan for MLF user run (Michikazu Kinsho)MR commissioning status (Tadashi Koseki)MR commissioning status (Tadashi Koseki)Urgent issues to be solvedUrgent issues to be solved

RFQRFQMR Magnet power supplyMR Magnet power supply

Beyond 100kW from 2010: Beyond 100kW from 2010: 100100 750kW(Design)750kW(Design)Space charge effect and collimator scenarioSpace charge effect and collimator scenarioLinac Linac 400 400 MeVMeV energy recovery and upgrade of the RCS injection systemenergy recovery and upgrade of the RCS injection system

LongLong--term plan toward power frontier term plan toward power frontier (~MW(~MW))KEK roadmapKEK roadmap

Contents:Contents:

MLF User run: MLF User run: 110 days110 days

Linac operation total: Linac operation total: 190 days 190 days

33--Month Summer shutdown: Month Summer shutdown: July~September July~September

MR operation schedule:MR operation schedule:Tentative !!!Tentative !!!

Tentative plan for Tentative plan for MLF userMLF user run and MR run in JFY2009run and MR run in JFY2009User Run Machine Study Maintenance

April May June

SunMonTueWedThuFri Sat SunMonTueWedThuFri Sat SunMonTueWedThuFri Sat

1 2 3 4 1 2 1 2 3 4 5 6

5 6 7 8 9 10 11 3 4 5 6 7 8 9 7 8 9 10 11 12 13

12 13 14 15 16 17 18 10 11 12 13 14 15 16 14 15 16 17 18 19 20

19 20 21 22 23 24 25 17 18 19 20 21 22 23 21 22 23 24 25 26 27

26 27 28 29 30 24 25 26 27 28 29 30 28 29 30

0 19 31 15 22

13 21

October November December


1 2 3 1 2 3 4 5 6 7 1 2 3 4 5

4 5 6 7 8 9 10 8 9 10 11 12 13 14 6 7 8 9 10 11 12

11 12 13 14 15 16 17 15 16 17 18 19 20 21 13 14 15 16 17 18 19

18 19 20 21 22 23 24 22 23 24 25 26 27 28 20 21 22 23 24 25 26

25 26 27 28 29 30 31 29 30 27 28 29 30 31

16 28 19 23 19 24

４４／９０


1 2 1 2 3 4 5 6 1 2 3 4 5 6

3 4 5 6 7 8 9 7 8 9 10 11 12 13 7 8 9 10 11 12 13

10 11 12 13 14 15 16 14 15 16 17 18 19 20 14 15 16 17 18 19 20

17 18 19 20 21 22 23 21 22 23 24 25 26 27 21 22 23 24 25 26 27

24 25 26 27 28 29 30 28 28 29 30 31

31 16 20 0 15

14 21 ６６／１００

Januar Februa March

RCSRCS

MR operation includes;MR operation includes;CommissioningCommissioningPower ImprovementPower ImprovementUser RunUser Run

Tentative RCS power up grade plane Tentative RCS power up grade plane for MLF User Run for MLF User Run ((NOT for MR)NOT for MR)

considering the lifetime of mercury targetconsidering the lifetime of mercury target

New RFQ

300 MeVInjection

400 MeVInjection

We need discussionsWe need discussions

MR MR 100kW 100kW

runrun

kWkW

Michikazu KinshoMichikazu Kinsho

MR commissioning statusMR commissioning statusTadashi Koseki for ATAC09Tadashi Koseki for ATAC09

11st st ––stagestage

Summer shutdownSummer shutdown

2nd2nd ––stagestage

3rd3rd ––stagestage

Tadashi Koseki for ATAC09Tadashi Koseki for ATAC09


Fast extraction Fast extraction tuningtuning


Slow extraction Slow extraction tuning and beam losstuning and beam loss

It’s a “Ripple extraction” using SX systemIt’s a “Ripple extraction” using SX systemWe need;We need;

further improvement of magnet power supplyfurther improvement of magnet power supplyinstallation of feedback systeminstallation of feedback system

StepsSteps


Beam loss study for SXBeam loss study for SX

Injection

Extraction

•• (1/6) Hz Test Operation(1/6) Hz Test Operation•• BLM : Max. 2500 Counts / Position BLM : Max. 2500 Counts / Position --------> 2.0E9 protons> 2.0E9 protons•• 17000 Counts / Total 1.4E10 17000 Counts / Total 1.4E10 •• Accelerated : 1.3E11 protons/6 sec (100 W)Accelerated : 1.3E11 protons/6 sec (100 W)•• Extraction Efficiency : ~ 90 %Extraction Efficiency : ~ 90 %•• Max. ~ 1.6 W Loss @ Each PositionMax. ~ 1.6 W Loss @ Each Position•• ===> Residual : 23 ===> Residual : 23 µµSvSv/h Max. /h Max. •• < 1 < 1 mSvmSv/h /h

•• < 70 W (Loss/SX area)< 70 W (Loss/SX area)

0

1

2

3

4

5

6

7

8

0 20000 40000 60000 80000 100000

Calibration of Beam Loss Monitor@ 30 GeV Slow Extraction / 2009. 02. 14

No.

of L

ost P

roto

ns (x

1.0

E10)

Count of Beam Loss Monitor

y = a*(Count)Value

8.0515e-5a0.98109R

Calibration of Beam Loss & Residual Radiation Level @ 30Calibration of Beam Loss & Residual Radiation Level @ 30 GeVGeVResonance ExtractionResonance Extraction


GuideGuide--line for allowable beam loss line for allowable beam loss at this momentat this momentupper limit < 25W/SX Areaupper limit < 25W/SX Area

& ALARA (& ALARA (AAs s LLow ow AAs s RReasonably easonably AAchievable)chievable)

Radiation Maintenance @ ISISRadiation Maintenance @ ISISFebruary 2009:February 2009:100W/10W loss 100W/10W loss 90% extraction eff.90% extraction eff.

250W/25W loss250W/25W loss

Extraction Efficiency should be upgradedExtraction Efficiency should be upgradedto obtain higher beam powerto obtain higher beam power500W/25W loss 500W/25W loss 95% (BNL Achievement)95% (BNL Achievement)2.5kW/25W loss 2.5kW/25W loss 99%99%~10kW will be coming within the range~10kW will be coming within the range

Only way to achieve the beam power of 100kWOnly way to achieve the beam power of 100kW--class SX,class SX,1.1. improve the extraction efficiency more and more,improve the extraction efficiency more and more,2.2. beam loss should be localized at the ESS and 2beam loss should be localized at the ESS and 2ndnd collimator, andcollimator, and3.3. radiation maintenance technology should be developed.radiation maintenance technology should be developed.

333333µµSv/hSv/h

25W loss25W loss

Plan of MR 100 kW trial in FY2009Plan of MR 100 kW trial in FY20091st Quarter: April, May, June1st Quarter: April, May, June

Fast extraction: establish neutrino primary beam line orbitFast extraction: establish neutrino primary beam line orbitHadron hall: Construction of secondary beam lines Hadron hall: Construction of secondary beam lines

2nd Quarter: July, August, September 2nd Quarter: July, August, September -- Machine ShutdownMachine ShutdownInstallation of EQ and RQ for spill controlInstallation of EQ and RQ for spill controlMaintenance and/or upgrade of troubled componentsMaintenance and/or upgrade of troubled componentsNeutrino Target Station (Installation of horn #2&3 fromNeutrino Target Station (Installation of horn #2&3 from julyjuly))

3rd Quarter: October, November, December3rd Quarter: October, November, DecemberFX: Power upgradeFX: Power upgradeSX: Spill control and power upgrade by reducing beam lossSX: Spill control and power upgrade by reducing beam loss

4th Quarter: January, February, March4th Quarter: January, February, MarchFX : Power upgrade toward 100 kW (for 10FX : Power upgrade toward 100 kW (for 1077 sec)sec)

EQ: Extraction Q to shape up the spill time structure, EQ: Extraction Q to shape up the spill time structure, RQ: Ripple Q to reduce ripple structureRQ: Ripple Q to reduce ripple structure

RFQ problemRFQ problemKazuo Hasegawa for ATAC09Kazuo Hasegawa for ATAC09

PISL:PISL:PiPi--modemodeSStabilizingtabilizingLLoopoop

RFQRFQ

Ion sourceIon source

Kazuo Hasegawa for ATAC09Kazuo Hasegawa for ATAC09

Prototype RFQ (same design)Prototype RFQ (same design)

multipactingmultipacting


Beam centerBeam centerVaneVane

VaneVane


MR magnet power supply problemsMR magnet power supply problems

Direct frequency conversion Direct frequency conversion from 22kV commercial AC line from 22kV commercial AC line using IGBT/IEGT switching unitusing IGBT/IEGT switching unit

Normal modeNormal modereactorreactor Passive filterPassive filter Active filterActive filter

CatchCatch--phrasephraseof the ambitiousof the ambitiousdesign:design:

CompactCompactHighHigh--efficiencyefficiencyPower factor=1Power factor=1Low noiseLow noise

Risks:Risks:Large switching noise from IGBTLarge switching noise from IGBT

delicate controldelicate control low repetition ratelow repetition rateFragile IGBTFragile IGBT poor availabilitypoor availability

No neutral line (point)No neutral line (point)No symmetric circuitNo symmetric circuit

large common mode large common mode noisenoise rippleripple

Current status;Current status;Ripple, low repetition rate and poor availabilityRipple, low repetition rate and poor availability

Not established technology but world first challengeNot established technology but world first challenge

Ultimate goal of the repetition rate Ultimate goal of the repetition rate 0.5Hz0.5Hz

How to solve problems?How to solve problems?

Add more filter and choke both for Add more filter and choke both for normal and common modesnormal and common modes

reduce ripple from 10reduce ripple from 10--44 to 10to 10--55~10~10--66

and recover better controland recover better controlRemodel (improve) for symmetric circuitRemodel (improve) for symmetric circuit

not only for power cable configurationnot only for power cable configurationbut also circuit itselfbut also circuit itself

0

200

400

600

800

-1 0 1 2 3 4

Ideal circuit by Hiroshi TokiIdeal circuit by Hiroshi Toki(Osaka Univ.)(Osaka Univ.)

Scenario beyond 100kWScenario beyond 100kW100100 750kW(Design)750kW(Design)

Main issue is the Space Charge EffectMain issue is the Space Charge EffectWe have only three knobs for this problem;We have only three knobs for this problem;

Collimator scenario to cut beam halloCollimator scenario to cut beam halloEnough apertureEnough apertureBunching factor Bunching factor

(RF fundamental(RF fundamental--modemode+Higher Harmonic cavities)+Higher Harmonic cavities)

Another parameter, which isAnother parameter, which isindependent from spaceindependent from spacecharge effectcharge effect

increase increase repetition raterepetition rate(magnet power supply issue)(magnet power supply issue)

Receive beam from RCS as much Receive beam from RCS as much as possible, andas possible, and

Accelerate and extract the beam Accelerate and extract the beam with minimum loss as quick aswith minimum loss as quick aspossible.possible.

Current bottleneckCurrent bottleneckPoor collimator capacityPoor collimator capacity

450W450WSmall fast extraction Small fast extraction apertureaperture

Rely on the adiabatic Rely on the adiabatic Damping at RCS and Damping at RCS and

MR @50 GeVMR @50 GeV

Emittance ~ (Emittance ~ (βγβγ))--11

Detuning effect of the low energyspace chargespace charge for J-PARC Main Ring

‘Bare’ working point:Qx0 = 22.428Qy0 = 20.824

Bunching factor ~ 0.2Chamber size = ± 70 mm

Beam power = 1.8kW/bunch(300kW from RCS)

Beam power = 3.6kW/bunch(600kW from RCS)

ORBIT_MPI

30% of design value30% of design value 60% of design value60% of design value

By Alexander MolodojentsevBy Alexander Molodojentsev

Power of LOST beam: wp2 / MRS=54pi

010

20304050

607080

90100

0 5000 10000 15000 20000

Number of Turns

Pow

er o

f LO

ST b

eam

[W]

Particle losses during the full injection process(~120 msec) for the realistic machine parametersfor the beam power of 1.8kW/bunch. (30% of design value)

The MR scraper acceptance is 54 πmm.mrad.Wp#2: 22.30 / 20.92 to avoid 3Qx resonance.VRF = 40kV (fundamental harmonic)

85W/bunch

Estimation of the lost beam power at MR scraper (wp#2)

~ 440 MR_Scr = 60πTR_MisMatched

~ 850MR_Scr = 54πTR_MisMatched

~ 128MR_Scr = 60πTR_matched

~ 400MR_Scr = 54πTR matched

Lost beam power [W]

Machine condition

• 4 batches operation (h=9)• TR_MisMatched -> 10% 10% beta-mismatching

ORBIT_MPI

By Alexander By Alexander MolodojentsevMolodojentsev

Particle losses during the injection process @ scraperParticle losses during the injection process @ scraper

Power of LOST beam

0

5

10

15

20

0 5000 10000 15000 20000 25000

Number of Turns

Pow

er o

f LO

ST b

eam

[Wat

t]

~ 17W/bunch

~ 120 msec

50 100 150 200 250200

300

400

500

600

700

800

900Normalized Acceptance (40GeV) of Fast Extraction Septum

99.9%_NORM_H 99.9%_NORM_V

Nor

m_E

mitt

ance

[pi.m

m.m

rad]

Time [msec]

3 GeV 7.008 GeVParticle losses during the accelerationfor the RF pattern (40kV -> 280kV).MR_Scraper acceptance = 60 πInitial mis-matched beam (10% beta mismatching).

Estimation of the 99.9% emittance after acceleration

Wkin=40GeV (βγ=43.62):εNORM (MAX) ~ 400π.

Then ε99.9% for 40GeV beam ~ 9.2 π

ORBIT_MPI

By Alexander By Alexander MolodojentsevMolodojentsevParticle losses during the acceleration processParticle losses during the acceleration process

Emittance Emittance is growing up to 7 is growing up to 7 GeV GeV and loss is increasingand loss is increasing

30 30 GeV GeV acceptanceacceptance

33--50BT Collimator section is 50BT Collimator section is located under the public roadlocated under the public road“HAKKEN DORO” “HAKKEN DORO” (between the Shrine and (between the Shrine and sea shore)sea shore)

<0.42<0.42µµSv/hSv/h

DistributionDistributionof neutronof neutron

Our baseline scenario to solve the collimator Our baseline scenario to solve the collimator problem problem develop 5 kWdevelop 5 kW--class collimators and class collimators and replace them as early as possiblereplace them as early as possible

22ndnd generation fast extraction devices should be developedgeneration fast extraction devices should be developedand several Qand several Q--magnet aperture should be improved magnet aperture should be improved to obtain enough aperture to obtain enough aperture at 30 at 30 GeVGeV

OriginalDesign

NewDesign

Ratio

MR energy (GeV) 50 30 0.6RCS power (kW) 1000 500 0.5RCS bunch current 1 2 2MR repetition rate 0.275 0.5 1.8Total 1.08

Scenario to achieve the design beam power (750kW) @ 30 Scenario to achieve the design beam power (750kW) @ 30 GeVGeV

In order to increase the RCS bunch current,In order to increase the RCS bunch current,RCS harmonic number should be 1 instead of 2RCS harmonic number should be 1 instead of 2

Risks;Risks;RCS cycle for MR injection: 120 RCS cycle for MR injection: 120 240msec240msecSpace charge force increasesSpace charge force increases

Necessary baseline condition;Necessary baseline condition;New collimator of 5kWNew collimator of 5kW--class capabilityclass capabilityEnough apertureEnough aperture

LongLong--term plan term plan toward MWtoward MW--classclass

power frontierpower frontierKEK roadmapKEK roadmap

2007 2008 2009 2010 2011 2012

KEKB : 1 (ab)-1

ILC R&D EDR

Photon Factory & upgradeoperation

LHC1st resultsoperation

J-PARCconstruction

ERL R&D

KEK RoadmapKEK Roadmap (July, 2007 : KEK Roadmap Panel led by F. Takasaki)(July, 2007 : KEK Roadmap Panel led by F. Takasaki)

operation & completion of 1st goal

power upgrade

upgrading to Super-KEKB

continue R&D and compact ERL

LHC upgrade

operation

continue R&D

DG DG Atsuto Atsuto SuzukiSuzuki

RF system improvement

0.60MW0.28 Hz

1.66MW0.52 Hz

BM power supply

0.91 MW0.57 Hz

•• Shorten acceleration time Shorten acceleration time •• More RF systemMore RF system•• Magnet power systemMagnet power system

•• More beam per pulseMore beam per pulse•• Operation of 3 Operation of 3 GeVGeV RCSRCS

in harmonic number =1in harmonic number =1

LinacLinac : 181 : 181 MeVMeV to 400 to 400 MeVMeV

DG DG Atsuto Atsuto SuzukiSuzuki

OriginalDesign

NewDesign

Ratio

MR energy (GeV) 50 30 0.6RCS power (kW) 1000 500 0.5RCS bunch current 1 2 2MR repetition rate 0.275 0.5 1.8Total 1.08

If we can receive more RCS beam power than 500 kW,If we can receive more RCS beam power than 500 kW,we can obtain higher power than 750 kW.we can obtain higher power than 750 kW.

Extensive studies are necessary;Extensive studies are necessary;Increase MR repetition rate,Increase MR repetition rate,Understand space charge effect,Understand space charge effect,Develop collimator and aperture scenario. Develop collimator and aperture scenario.

SummarySummary

NeutrinoNeutrino1.1. Early achievement of 100kW run (for 10Early achievement of 100kW run (for 1077 sec)sec)2.2. Create strong team to consider and work for the power upgrade scCreate strong team to consider and work for the power upgrade scenario enario

from 100 to 750kW.from 100 to 750kW.3.3. The above second step should be the base of the MWThe above second step should be the base of the MW--class power frontier machine. class power frontier machine.

HadronHadron1.1. Early realization of spill control by;Early realization of spill control by;

1.1. improving magnet power supplies, andimproving magnet power supplies, and2.2. applying feedback system.applying feedback system.

2.2. Early achievement of 10kWEarly achievement of 10kW--class power by;class power by;1.1. understanding and suppressing and/or localizing the beam loss. understanding and suppressing and/or localizing the beam loss.

3.3. In order to realize 100kWIn order to realize 100kW--class slow beam extraction, we have to develop;class slow beam extraction, we have to develop;1.1. excellent extraction efficiency,excellent extraction efficiency,2.2. more beam loss control, andmore beam loss control, and3.3. radiation maintenance technology. radiation maintenance technology.

Backup slidesBackup slides

Date Beam Condition Required items

2008.122008.12-- 20 kW; 5mA/0.1ms/560ns20 kW; 5mA/0.1ms/560ns

2009.052009.05-- 2020--100 kW100 kW-- 100kW; 100kW;

15mA/0.17ms/560ns15mA/0.17ms/560ns

・・Reduction of injection lossReduction of injection loss

2010.102010.10-- 5050--200 kW200 kW-- 100kW : 5100kW : 5--15mA/0.5015mA/0.50--

0.17ms/560ns0.17ms/560ns-- 200kW : 200kW :

10mA/0.50ms/560ns10mA/0.50ms/560ns

・・Cure for foilCure for foil--scattering lossscattering loss・・AC power supply for chromatic correction AC power supply for chromatic correction sextupolessextupoles・・11 sets of RF cavities 11 sets of RF cavities ・・New RFQNew RFQ

20112011-- 100100--300 kW300 kW-- 300kW; 300kW;

15mA/0.50ms/560ns15mA/0.50ms/560ns

・・12 sets of RF cavities12 sets of RF cavities

20132013-- 100100--300 kW300 kW ・・300 300 MeVMeV injection (injection (EEinjinj=300 =300 MeV MeV ((ββ22γγ33))300300/(β/(β22γγ33))181181=1.94)=1.94)

20142014-- 200200--300 kW300 kW

20152015-- 200200--500 kW500 kW-- 500kW; 500kW;

25mA/0.5ms/560ns25mA/0.5ms/560ns

・・400 400 MeVMeV injection (injection (EEinjinj=400 =400 MeV MeV ((ββ22γγ33))400400/(β/(β22γγ33))181181=2.92)=2.92)・・RCS injection system for 400 RCS injection system for 400 MeV MeV

--injection bump, paint bump, and injection bump, paint bump, and ……

Issues for RCS power upgradeIssues for RCS power upgrade


20% of normal width due to RFQ problem20% of normal width due to RFQ problem

Design repetition is 3.64 secDesign repetition is 3.64 sec

Simultaneously operationSimultaneously operationwith MLFwith MLF

6 second cycle due to6 second cycle due tomagnet power supplymagnet power supplyproblemproblem


April 2008April 2008

September 2008September 2008

Improvement of BM Power Supply: BL ripple was improved drastically by adoptingsymmetrical power cable configuration between the power supply and the magnet

Frequency (Hz)Frequency (Hz) Frequency (Hz)Frequency (Hz)

Serious problems of MR magnet power Serious problems of MR magnet power Supply were found.Supply were found.

The half year operation of quick and The half year operation of quick and “crazy” work has been carried out !“crazy” work has been carried out !Improvement of Improvement of Power supply itself, andPower supply itself, andPower cable configurationPower cable configuration

BLBL

Current rippleCurrent rippleDrastic improvementDrastic improvement

DetailsDetails see previous PAC talk by A. Andosee previous PAC talk by A. Ando


ImprovementImprovementof ripple problem of ripple problem


1. Acceleration and fast extraction1. Acceleration and fast extraction

2. Slow extraction2. Slow extraction

3. Government inspection3. Government inspection

Horizontal and Horizontal and VerticalVertical　　COD COD CorrectionCorrection

ImprovementImprovementof ripple problem of ripple problem

MayMay


Documents

J-PARC Accelerator Status and Commissioning Plannuclpart.kek.jp/pac/0903/pdf/PAC_yoshioka.pdf · J-PARC Accelerator Status and Commissioning Plan PAC meeting, Masakazu Yoshioka (KEK),