rhic heavy ion run-11 status meeting updates. heavy ion run final update 6/24-27 ● physics...

RHIC Heavy Ion Run-11

Status Meeting Updates

Heavy Ion Run Final Update 6/24-27

● Physics running, 41 stores

– Tandem intensity issues

– Access controls failure

– Access for RF trip

Outstanding items

Next 48 hours 6/27-29

● Physics ends 2200 Tuesday 6/28

● APEX and Power Supply tests until 0600

Wednesday 6/29

Heavy Ion Run Update 6/22-6/24● Physics running, 28 stores

– No failed ramps

– 4 aborted stores

● ODH HW failure

● Node card failure

● Abort kicker trip

● Power dip

● Blue injection retuned

● Reduced store length to 1

hour

● Conducted vernier scans

Outstanding items

● Yellow end-ramp

efficiency

– Better overnight

– Injection damper issues?

Weekend outlook 6/24-27

● Network recovery

● Continue Physics

● APEX and MD next week?

● Last meeting: Monday, noon

Heavy Ion Run Update 6/20-6/22● Setup started ~1730

Monday

● Physics started ~1730

Tuesday

– 6 stores

● Injection & ramp

collimation implemented

● Correcting injection drift

● Tandem reverted to optimal

Au configuration

Outstanding items

● Blue injection efficiency

● Yellow ramp efficiency

● Injection damper issues?


● Continue Physics

– Store length? Optimal ~1 hour.

– Can detectors remain on?

● Status meetings M-W-F


– 2 failed ramps

● Blue abort prefire

– 1 aborted store

● power dip, QLI

● Tandem foil work conducted

behind store Friday.

● One additional store for

AnDY (16081)

● 200 GeV Physics ended 0800

Monday.

Outstanding items


● Storage cavity voltage

calibration

– Blue cavities

– Requires working Blue

longitudinal Schottky

27 GeV startup 6/20-22

● Starts Monday 1600– IR access during hysteresis– Beam development follows

● Re-establish injected beam● Ramp with feedback● Store setup



– 1 failed ramp

● LLRF test ramp

– 1 aborted store

● False BLM trip, 7W

● IP2 crossing angle removed after

maintenance

– Corrected with feedbacks

● Machine Development: 9 hours

– 7 hours LLRF

● Punctuated with 2 HLRF

failures/accesses and Blue injection

kicker failure

● Second ramp needed

– 2 hours AnDY collision setup

Outstanding items

● Tandem low on stripping foils


● Blue transition

– Landau problem again, fill

16071


calibration

– Blue cavities



ZDC Accidental correction

● Number of buckets: Blue filled bunches

● STAR

– ZDC Singles East, ch 1

– ZDC Singles West, ch 2

– ZDC, ch 3

Corrected=ZDC-{East*West/[(Blue-Blue/14)*78000]}

● PHENIX

– ZDC Singles North, ch 1.1

– ZDC Singles South, ch 1.2

– ZDC, ch 16

Corrected=ZDC-[North*South/(Blue*78000)]

Final 200 GeV weekend 6/17-20

● Continue Physics– One more store with AnDY– One more set of vernier scans– One more test of β* squeeze

● Tandem foil work behind store● APEX Monday 0800-1600● √SNN = 27 GeV beam development starts Monday

1600● Status meetings M-W-F


– 3 failed ramps

● Yellow feedback target tunes too

close?

● Yellow debunching before accramp

● Blue abort kicker prefire + quench


● Yo1-sxf1 trip

● Yellow abort kicker prefire + quench

● Wrong Chrom values left from MD

● Cryo lead flow interlock

● Beta squeeze, DX ramp test for

AnDY work

– Partially behind Booster RF failure

● Some Tandem intensity issues

Outstanding items



calibration

– Blue cavities




● LLRF firmware upgrade

– Dump at 0900 tomorrow to begin

● AnDY ZDC calibration

– 2 stores following LLRF work

● Continue Physics● √SNN = 27 GeV beam development next Monday



– 2 failed ramps

● Network switch failure,

11A

● BBQ lock windows not set

for ramp

– 1 early dump

● Rebucketing failure, HLRF

misconfiguration after

access

Outstanding items

● Blue longitudinal problems

on ramp



calibration

– Blue cavities


– 4 hrs, week of 6/13


27 GeV medium energy run notes

● Ramp name Au11v6 (work in progress)

– 13.5 GeV beam energy

– 3m β* at IP6 and IP8

– Below transition

● No rebucketing

● No longitudinal cooling

● AP shifts start 0800 Monday 6/20


● End of store MD: β* squeeze at IP6– Slow ramp to try and eliminate rise in beam decay

● Continue Physics– Continue fine tuning cooling for best performance.

● √SNN = 27 GeV beam development next

Monday● Status meetings M-W-F


– no failed ramps

– 2 early dumps

● Sextupole temperature

problems in 1003B

● APEX, 16 hours

– Lost 4 hours to weather

and related issues.

Outstanding items

● Blue longitudinal problems on

ramp

– Although, none on the last few

ramps


● Storage cavity voltage calibration

– Blue cavities





● Access for PHENIX RPC issues.● Continue Physics

– Continue fine tuning cooling for best

performance.

● NOTE plan to run at √SNN = 27 GeV



– 1 failed ramp

● Early ramp loss, LLRF problem


● Yellow abort kicker

● Yellow RF permit failure

● Machine development

– Beta* squeeze test, “MAD-X

knob”

– Some complications to

measured results, will try again

Outstanding items

● Blue longitudinal

problems on ramp



calibration

– Blue cavities



Cooling on vs. off

Next 48 hours 6/6-8

● Continue Physics– Continue fine tuning cooling for best

performance.● Test β* squeeze at end of store.● APEX Thursday

– Note NSRL/Tandem Si beam conflict● Status meetings M-W-F


– 3 failed ramps

● Sextupole trip late in ramp

● Early Blue loss, RF or node

card?

– 1 aborted store, QD problem

– Landau cavity issues at

transition


– Beta* squeeze test, “MAD-

X knob”

Outstanding items



calibration

– Blue cavities



● Stochastic cooling issues

– BL kicker drive

Next 48 hours 6/6-8

● Continue Physics– Continue fine tuning cooling for best

performance.● APEX Wednesday

– Note NSRL/Tandem Si beam conflict● Status meetings M-W-F

Heavy Ion Run Update 5/27-6/1● Maintenance, vacuum pump down

complete Thursday 0330.

– STAR, PHENIX polarity reversal


– 1 early dump

● Low rates, Blue vacuum


● Yellow quench after rebucketing, YS5

cavity problem

● Yellow abort late in store, related to

activate?

● Cryo lead flow


– Beta* squeeze test, all planes both IRs

– Working point scan

– Yellow RF cavity voltage calibration

Outstanding items



calibration

– Blue cavities



● Stochastic cooling issues

– BL kicker drive repair

– BV not yet operational

New RF voltage calibrations

Present Yellow working point

Run-10 Yellow working point


● Restore stochastic cooling systems– Requires additional access– PHENIX access concurrently

● Continue Physics– Vernier scans Friday: early in store



– 5 failed ramps

● Early loss attributed to y-qtrim?

● Yellow RF trip on ramp

● Fast Blue loss ~10 sec after γt (2x)

● Unexplained fast Blue loss late in ramp


● PASS failure

● Blue abort kicker

● STAR magnet ramping/chiller problems

● Early dump, YS3 trip/bad rebucketing

● QLI at dump, Yellow debunched beam

– 1 extended store

● Insufficient Tandem beam

● Some YL cooling issues, off for last 3 stores

Outstanding items

● Yellow, Blue store conditions



– 1 test ramp

● BV cooling pickup

– Maintenance day item



● AGS ag17-qgt magnet failure

– Deferred to shutdown

Next 48 hours 6/1-3

● Complete maintenance– BV cooling pickup– YL cooling kicker motion control– YS2, YS3 RF– Yellow collimator pindiodes

● Resume Physics– STAR, PHENIX polarity switches– Vernier scans Thursday or Friday: early in store

● Machine Development Thursday:– End of store: test beta* squeeze, 2 IRs 4 planes– Starts between daytime stores– Store conditions

● Working point scans (dedicated ramp)● Storage voltage calibration


Heavy Ion Run Update 5/23-25● APEX completed Wednesday

– Attempt at fixing post-γt ramp loss


– 3 failed ramps

● Early loss attributed to y-qtrim?

● FEC reboot and subsequent steering error

● Fast loss ~10 sec after γt

– 1 aborted store

● Unexplained permit drop 6a to 7a

– AGS vacuum failure+Blue injection kicker

● Other work completed concurrently

– Machine Development deferred

– Some YV cooling issues(limit switch

fixed)

Outstanding items

● AGS ag17-qgt magnet failure

– Long maintenance day or shutdown

repair

● Yellow, Blue store conditions



– 1 test ramp

● BV cooling pickup

– Maintenance day item



Holiday weekend 5/27-31

● Continue Physics● Machine Development items:

– Store conditions● Working point scans (dedicated ramp)● Yellow negative chromaticity? Blue?● Beta* squeeze – prepare for automation.

– More beam– Ramp Efficiency

● Ramp quicker after fill

● Status meetings M-W-F● Run Coordinator will be off-island but on cell...● AP shifts: on call

– ...but be prepared to log in remotely or come in if necessary.

Heavy Ion Run Update 5/23-25● Physics running, 7 stores

– No aborted stores (2 early dumps, 1 late

dump).

– 5 failed ramps

● Sextupole ramp rate (2x)

● Post-transition loss (3x)

– Accesses for repairs: YA1 cavity, stochastic

cooling amplifiers, sextupole feedthrough

ground current, collimator pin diodes…

– QD controls problems (2x)

● 3rd test of beta squeeze at store

– 4 planes successfully squeezed at once

– Requires more beam time to measure optics,

interpret resulting rate changes.

● Vernier scans conducted

● Outstanding items

– Blue, Yellow store conditions

● MD Thursday

– Storage cavity voltage calibration

● Requires test ramp

– Blue injection efficiency

● Fine tuning

● Offline evaluation

– AGS: ag17-qgt, tune quad

– ATR synchro errors

– BV cooling pickup

● Open vacuum to repair

– LLRF firmware upgrade

● 4 hrs week of 6/13


● APEX completes 2359 tonight ● Continue Physics● Machine Development Thursday

– Store conditions● Working point scans (dedicated ramp)● Yellow negative chromaticity? Blue?● Beta* squeeze – prepare for automation.

– More beam– Ramp Efficiency


● Status meetings M-W-F ● AP shifts: on call


Heavy Ion Run Update 5/20-23


– Only 2 failed ramps (Yellow abort

prefire)

– No aborted stores.

● All stochastic cooling systems on

– Still some kicker insertion issues

● Additional test of beta squeeze at

store (successful)

– Requires more beam time to

measure optics, interpret resulting

rate changes.

● Outstanding items– YA1 cavity problem

– Source/injector intensity

– Blue, Yellow store conditions● Ready for more beam?

– Storage cavity voltage

calibration● Requires test ramp


● Fine tuning



● Continue Physics– AGS access behind store for RF?– Store length with cooling?

– Continue stochastic cooling development● Machine Development items for improved luminosity

– More beam– Store conditions

● Working point scans (dedicated ramp)● Yellow negative chromaticity? Blue?● Beta* squeeze – prepare for automation.

– Ramp Efficiency● Ramp quicker after fill



Heavy Ion Run Update 5/18-20● Maintenance completed

– YS5, BS5 in operation

– Booster B3 RF modified


– Storage cavity trip at rebucketing

– Loss at rebucketing

– AGS extraction issue, early dump

– Power dip

– Loss at transition

● All stochastic cooling systems on but…

– YL slip detection issue

– BV broken switch

● Beta squeeze at store tested

● Outstanding items– Source/injector intensity

– Tenuous Yellow store

conditions


calibration


● Fine tuning


YL, BL

YL, VL, YV, BV

YL, BL, YV, BV

YL, BL, YV

Measured tune shift at rebucketing


● Continue Physics– Store length with cooling?

● Stochastic cooling– Goal: all 4 operational this weekend

● Machine Development items for improved luminosity– Store conditions

● Yellow negative chromaticity? Blue?● Check y5-lm3.2 loss, collimation setup


– More beam





– Yellow losses after rebucketing (5x)

– bo3-sxd1 trip, loss after rebucketing

– ATR cogging problem during/after

MD

– Other LLRF issue?

● “Cured” by hysteresis

● Machine Development

– Corrected Blue injection

● Yellow vertical cooling

operational, but losses at kicker

exceed limits

● Outstanding items– Blue injection efficiency

● Fine tuning


– Booster B3 RF, deferred

troubleshooting

– YS5, BS5 cavity conditioning● Maintenance item


calibration

Injection efficiencies

5-May

6-May

7-May

8-May

9-May

10-May

11-May

12-May

13-May

14-May

15-May

16-May

17-May

18-May

19-May

0

100

200

300

400

500

600

700

Run11 RHIC AuAu Integrated Luminosity for Physics (200 GeV)

STAR PHENIX

Lmax Lmin

Phenix Run10

date

Inte

gra

ted

Lu

min

osi

ty [

mb

^-1

]

thru store 15877 Tuesay 17 May

Lumi data error corrected(still Run-10 cross section)


● Finish Maintenance● Continue Physics

– Store length with partial cooling?

● Stochastic cooling setup, Blue vertical– Every possible store

● Machine Development items for improved luminosity– Store conditions

● Yellow negative chromaticity? Blue?● Have we drifted from optimal working point?


– More beam



Heavy Ion Run Update weekend

5/13-16● Physics running, 12 stores

– Landau cavity

configuration issue

– Controls server failure

+ restoration issue

– Transition abort

– Yellow store collimation

● Blue & Yellow longitudinal

cooling operational




troubleshooting

– YS5, BS5 cavity

conditioning

This week’s outlook 5/16-?

● Continue Physics– Store length w/o cooling should be 4 hours.

● Stochastic cooling setup, vertical– Every possible store

● Machine Development items for improved luminosity– Ramp Efficiency

● Blue injection efficiency● Ramp quicker after fill● Yellow beam decay spikes at rebucketing.● Longitudinal growth after transition – gap volts? Low intensity bunch?

– More beam

● Next meetings M-W-F ● AP shifts: on call




– Peak luminosities

approaching best stores

from last run

● Yellow longitudinal

cooling operational

● Blue longitudinal tested,

not yet operational


– BS2 cavity trip


● Better, but still variable


troubleshooting

– YS5, BS5 cavity

conditioning

● More conditioning for YS4,

BS4?

Longitudinal cooling on/off

Weekend 5/13-16


● Stochastic cooling setup– Every possible store


● Ramp quicker after fill● Blue injection efficiency● Transition efficiency – chromaticity? Yellow dipole feedback?● Yellow beam decay spikes at rebucketing.

– More beam

● Next meeting Monday noon in LCR. ● AP shifts: on call




● Stochastic cooling setup

continues

● APEX

● Maintenance

– YA2 opened, repaired

– YS4, BS4 cavities in operation

– LLRF failure post-

maintenance



● Better, but still variable


troubleshooting

– Vernier scans

– YS5, BS5 cavity

conditioning

● More conditioning for YS4,

BS4?

Stores since Tuesday

Injection efficiency

IR4 Vacuum






● Transition efficiency – chromaticity? Yellow dipole feedback?

● More vernier scans?

● Meeting tomorrow noon in LCR. ● AP shifts: on call



● Access for RF

troubleshooting, experiments

● Physics running, more long

stores

– PS problems

● Main magnet

– Abort kicker prefire

– Stochastic cooling trip


continues


– YA2 cavity

– AGS extraction efficiency



troubleshooting

– Vernier scans

– YS4, YS5, BS4, BS5

cavity conditioning

5-May

6-May

7-May

8-May

9-May

10-May

11-May

12-May

13-May

14-May

15-May

16-May

17-May

18-May

19-May

0

100

200

300

400

500

Run11 RHIC AuAu Integrated Luminosity for Physics (200 GeV)

STAR PHENIX

Lmax Lmin

Phenix Run10

date

Inte

gra

ted

Lu

min

osi

ty [

mb

^-1

]

thru store 15818 Monday 09 May

Next 24 hours 5/10-11● Continue Physics

– Reduce store length w/o cooling?


● Machine Development items for improved luminosity– AGS extraction efficiency work (parasitic)

● Still ~7% low?


● Transition efficiency – chromaticity?

● Schedule vernier scans

● APEX 0001-0800● Maintenance 0800-1600● NO MEETING TOMORROW ● AP shifts: on call


Heavy Ion Run Update

weekend 5/6-9● Physics running but with few

normal dumps

– PS problems

● Sextupole trip

● Main magnet

● UPS

– Periodic orbit correction/lead flow

– Abort kicker prefire

– Stochastic cooling trip

– YA2 RF problems


continues


– YA2 cavity

– AGS extraction efficiency


troubleshooting

– Vernier scans

– YS4, YS5, BS4, BS5

cavity conditioning

– WCM calibration?

Weekend stores

Rates and backgrounds

WCM and DCCT


● Troubleshoot YA2● Continue Physics

– Reduce store length w/o cooling?


● Machine Development items for improved luminosity– AGS extraction efficiency work (parasitic)– Ramp Efficiency


● Transition efficiency – chromaticity?

● Schedule vernier scans● AP shifts: on call


Heavy Ion Run Update 5/5-6● Rebucketing

operational

● 2 stores overnight


– Ramp efficiency

● 5-6% snapback loss

● 3-8% transition loss

– Storage cavity conditioning

● New cavities not yet up to

voltage

– Booster B3 RF cavity

● May limit our highest

injector intensities

– BS3 cavity

● investigating

Weekend 5/6-9● Ramp tuning

– Transition losses – chromaticity?– Orbit after transition– Injection debunching – check cavity phasing?– Continue ramp collimation setup

● Physics– Store length 4 hours?

● Store setup– Stochastic cooling setup, longitudinal first– Check & adjust store chromaticity– Increase bunch intensity/number up to 1.3/111

● Other items– Check injection drift correction – Optics measurements, Blue– Ramp chromaticity with Booster off?

● WEEKEND MEETINGS -- cancelled

Heavy Ion Run Update 5/4-5● Beam resumed ~2000 after

maintenance – Bunch intensities approaching 1.3e9

● YA1 cavity operational

● Landau cavities on

● Rebucketing setup started– Storage cavity phasing

● Yellow store chromaticity measured– Suggests negative horizontal

● Yellow tune scan at store– Best Yellow: (.2319, .2071)

– Blue: (.2310, .2147)

● b2-dhx, sector 5 qgt problems


– Ramp efficiency

● 5-6% snapback loss

● 3-8% transition loss

– Storage cavity

conditioning

● New cavities not yet up to

voltage

– WCM rebucket error


● May limit our highest

injector intensities

Ramp Efficiency

Present working point

Next 24 hours 5/5-6

● Store setup– Rebucket setup has highest priority– Stochastic cooling setup, longitudinal first– Check & adjust chromaticity– Increase bunch intensity/number up to 1.3/111

● Overnight stores for experiments– Pending rebucket work

● Other items– Continue ramp collimation setup– Check injection drift correction – Optics measurements– Ramp chromaticity with Booster off?


● Collisions established

– 79x79, 1e11

● Initial collimation

complete

● 10 Hz feedback running

● Gap cleaning operational


– YA1 cavity

● Repair made, opened

vacuum during maintenance

today

– Misc elog issues

● Ramp efficiency entry

● RatView scales


Store tunes

IPM Emittance

Next 24 hours 5/4-5

● Finish maintenance, restore beam– Evaluate YA1 repair

● Store setup– Rebucket setup– Stochastic cooling setup, longitudinal first– Increase bunch intensity/number up to 1.3/111

● Other items– Landau cavities– Check injection drift correction – Continue ramp collimation setup– Store chromaticity, Yellow– Optics measurements– Ramp chromaticity with Booster off?


● Beam to store on first ramp

● Ramp development finishes

major work in ~3 hours

● Completed items:

– Gamma jump, yellow dipole

feedback

– BPM timing @ injection, store

– Tune/coupling/orbit feedback

employed

– Tune/coupling replay exercised

– Ramp chromaticity measurement


– YA1 cavity

● Presently focusing on external

issues

– Note change in global beam sync

timing

● 26 ns Blue

● 24 ns Yellow

– WCM transition

– Misc elog issues

● Ramp efficiency entry

● Injection statistics?

● RatView scales

First ramp attempt

Blue ramp chromaticity

Yellow ramp chromaticity

Next 24 hours 5/3-4

● Ramp development, store setup until 0700 Wednesday– Investigate YA1 issue (access if necessary)– Increase bunch intensity/number up to 56 – Ramp collimation– RhicInjection orbit feedback test– RF cogging on ramp– Separation bump removal on ramp– Steer for collisions– Rebucket? Stochastic cooling?– Ramp chromaticity with Booster off?

Heavy Ion Run Update 4/29-5/2

● Low energy run

completed at 0800 this

morning

● Weekend troubles:

– Lead flow interlock

– AGS L10 RF cavity


– Injection efficiency

● Lower than normal injection

● Limits injected intensity


troubleshooting

Next 24 hours 5/2-3

● Injection beam development 1100-1300● PS ramp testing, Booster B3 RF troubleshooting ~1300-

1500 Monday.● Setup with beam resumes 1500 today.● AP shifts resume

– Re-establish injection– Instrumentation check– Ramp Development


● PHENIX zero field run

completed, settings

reverted.

● Second set of vernier

scans conducted.

● Power dip 1550-0030

– Booster, AGS ring accesses

required






troubleshooting

– Vernier scans

Weekend 4/29-5/2

● Continue Physics– Store length = 30 min

● Last vernier scans● APEX 0800-1400 Monday● √sNN=200 GeV setup begins 1400 Monday

– Ramp Au11v3::injection→Au11v1::injection with beam, feedback

● PS ramp testing, Booster B3 RF troubleshooting ~1600

Monday.● AP shifts resume Monday evening


● PHENIX zero field run

under way.






troubleshooting

– Vernier scans

Run-10 Au-Au

Run-11 Au-Au


● Resume normal stores● Continue Physics

– Store length = 30 min

● More vernier scans● AP shifts: on call



● Initial vernier scans

completed

– Optimized PHENIX,

repositioned STAR

● Booster beamstop failure

2130-0600

– Replaced bo6-qs3, yi6-sx3

– Repaired bi8-qf3

– Sublimated sector 4 vacuum




– Orbit control

● High RMS since hysteresis


troubleshooting

– Vernier scans


● Examine closed orbit, injection efficiency● Continue Physics

– Store length = 30 min

● More vernier scans● PHENIX zero field run

– Prior to tour access

● AP shifts: on call – ...but be prepared to log in remotely or come in if necessary.

● NO MEETING TOMORROW


● MD for Yellow

– Delayed by Booster failure

– Yellow orbit work: 1 hour

● Injection efficiency up > 10%

● No BLM issues since

– Initial collimation work: 1 hour

But…

● Blue orbit shifted

– Why? No evidence found yet

– Corrected blue steering for collisions

– Re-collimated.

– Eventually, corrected closed orbit

again and resteered, collimated.




– Orbit control

● Can we correct orbit drift?

Should we?

● BPM issues?


troubleshooting

– Vernier scans

– bo6-qs3 failure



● Schedule vernier scans● AP shifts: on call


Heavy Ion Run Update Weekend

4/22-25/11● Mostly continuous running

– Over 80 stores since Friday

afternoon

– Store length reduced to 30 min

● Optimal ~15-20 min

● Scanned RF voltages

● PHENIX “vertex shift”

– Determined to be collimator

backsplash from opposite ring


– Beam lifetime



– Orbit control


troubleshooting

– Vernier scans

– bo6-qs3 failure

– Instrumentation setup

● IPM, WCM



● Machine Development items for improved luminosity– Work on orbit feedback management

● Yellow bend trim adjustment

– Injection efficiency work– Beam lifetime work

● Change working point● Better RF voltage choice (parasitic)?● Octupoles (parasitic)?

– 10 Hz GOFB (parasitic)● Schedule vernier scans● AP shifts: on call


Heavy Ion Run Update Fri 4/22/11

● Booster B3 RF cavity running,

issues unresolved

– Will be of concern when we

start to push for maximum

injector performance

● Beam restored, captured in

both rings

● Tuned up to nominal intensities

● Initial collision steering and

collimation successful


– Bunched beam lifetime


troubleshooting

– Store automation

Weekend 4/22-24

● Start Physics– Store length = 1 hour?

● Improve store conditions, store turnaround times.– Store automation

– Optimize rates, minimize backgrounds

– Increase intensities

● AP shifts: Friday in MCR, Saturday/Sunday on call – ...but be prepared to log in remotely or come in if necessary.

● NO meeting Sunday. Saturday?

Heavy Ion Run Update Thu 4/21/11

● 28 MHz RF repairs, q7

polarity reversal complete

Wed ~2300

● Beam restored to both rings

● Intensities too low for RF

capture

● Beam from injectors unstable

● Node card/UPS failure,

1007C


– Tunes far from design

– Corrector strength/avg

offset too high?

– Booster B3 RF, AGS

bunch merge

RHIC operations

Injector performance

ATR transport


● Repair Booster B3 RF cavity● PHENIX access for tour● Resume RHIC injection setup

– Circulating beam● Check set/measured tunes vs. Au104/6/7

● Revert orbits to pp or med/hi Au ramps?

– RF capture

– Lifetime/intensity tuning

Heavy Ion Run Update Wed 4/20/11● 28 MHz RF acceleration cavity mechanical tuner problem

– fRF at 9 GeV: 27.9996 MHz

– fRF at 9.8 GeV normal injection: 28.0232 MHz

– Cavity lower limit: 28.070 MHz

● Setup items completed:– AGS-RHIC synchro

– AGS extraction, ATR transport (twice)

– 9.8 GeV lattice loaded

– RHIC first turn

– Injection kicker setup, circulating beam Blue and Yellow

– Blue RF capture


● Access to repair RF cavity tuners● Reverse q7 polarities, switch to IBS lattice.● Address other maintenance items

– AGS main magnet motor maintenance

● Resume RHIC injection setup– 9.8 GeV, Au11v3– First turn

– Circulating beam

– RF capture

– Lifetime/intensity tuning

rhic heavy ion run-11 status meeting updates. heavy ion run final update 6/24-27 ● physics...

Documents

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