rhic heavy ion run-11

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

● Blue injection efficiency● 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 injection efficiency● Blue transition

– Landau problem again, fill 16071

● Storage cavity voltage 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

– 4 aborted stores● 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





● 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● Status meetings M-W-F


– 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● Blue injection efficiency

● Storage cavity voltage calibration– Blue cavities

● LLRF firmware upgrade– 4 hrs, week of 6/13

● AnDY ZDC calibration

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

● Blue injection efficiency● Storage cavity voltage calibration

– Blue cavities


● AnDY ZDC calibration


● Access for PHENIX RPC issues.● Continue Physics

– Continue fine tuning cooling for best performance.

● NOTE plan to run at √SNN = 27 GeV● Status meetings M-W-F


– 1 failed ramp● Early ramp loss, LLRF problem

– 2 aborted stores● 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




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

● Machine development– Beta* squeeze test, “MAD-X

knob”

Outstanding items● Blue injection efficiency● Storage cavity voltage



● 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

● Physics running, 5 stores– 1 early dump

● Low rates, Blue vacuum

– 3 aborted stores● Yellow quench after rebucketing, YS5 cavity

problem● Yellow abort late in store, related to activate?● Cryo lead flow

● Machine development– Beta* squeeze test, all planes both IRs

– Working point scan

– Yellow RF cavity voltage calibration

Outstanding items● Blue injection efficiency

● Storage cavity voltage 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

– 5 aborted stores● 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

● Blue injection efficiency

● Storage cavity voltage calibration– 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

● Physics running, 4 stores– 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● Blue injection efficiency● Storage cavity voltage calibration

– 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

Next 48 hours 5/25-27● 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

● Ramp quicker after fill

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



– 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

– Blue injection efficiency● Fine tuning● Offline evaluation

Next 48 hours 5/23-25● 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

● Physics running, 8 stores– 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– Storage cavity voltage

calibration– Blue injection efficiency

● Fine tuning● Offline evaluation

YL, BLYL, VL, YV, BV

YL, BL, YV, BVYL, BL, YV

Measured tune shift at rebucketing

Weekend outlook 5/20-23● 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● Offline evaluation

– Booster B3 RF, deferred troubleshooting

– YS5, BS5 cavity conditioning● Maintenance item

– Storage cavity voltage 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

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Run11 RHIC AuAu Integrated Luminosity for Physics (200 GeV)

STAR PHENIX

Lmax Lmin

Phenix Run10

date

Inte

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[mb^

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thru store 15877 Tuesay 17 May

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

Next 48 hours 5/18-20● 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



– 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

● Outstanding items– BS2 cavity trip

– Blue injection efficiency● Better, but still variable



● More conditioning for YS4, BS4?

Longitudinal cooling on/off

Weekend 5/13-16● Continue Physics

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

● Stochastic cooling setup– Every possible store

● Machine Development items for improved luminosity– Ramp Efficiency

● 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


– Vernier scans


● More conditioning for YS4, BS4?

Stores since Tuesday

Injection efficiency

IR4 Vacuum


– Store length w/o cooling should be 4 hours.● Stochastic cooling setup

– Every possible store● Machine Development items for improved luminosity

– Ramp Efficiency● Ramp quicker after fill● Transition efficiency – chromaticity? Yellow dipole feedback?

● More vernier scans?● Meeting tomorrow noon in LCR. ● AP shifts: on call


Heavy Ion Run Update 5/9-10● Access for RF

troubleshooting, experiments● Physics running, more long

stores– PS problems

● Main magnet

– Abort kicker prefire

– Stochastic cooling trip


● Outstanding items– YA2 cavity

– AGS extraction efficiency

– Blue injection efficiency


– 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

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Run11 RHIC AuAu Integrated Luminosity for Physics (200 GeV)

STAR PHENIX

Lmax Lmin

Phenix Run10

date

Inte

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[mb^

-1]

thru store 15818 Monday 09 May


– Reduce store length w/o cooling?


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

● Still ~7% low?

– Ramp Efficiency● Ramp quicker after fill● Transition efficiency – chromaticity?

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


Heavy Ion Run Updateweekend 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



– AGS extraction efficiency


– Vernier scans

– YS4, YS5, BS4, BS5 cavity conditioning

– WCM calibration?

Weekend stores

Rates and backgrounds

WCM and DCCT

Next 24 hours 5/9-10● Troubleshoot YA2● Continue Physics

– Reduce store length w/o cooling?


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

● Ramp quicker after fill● Transition efficiency – chromaticity?

● Schedule vernier scans● AP shifts: on call


Heavy Ion Run Update 5/5-6● Rebucketing

operational● 2 stores overnight

● Outstanding items

– 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

● Outstanding items– Ramp efficiency

● 5-6% snapback loss● 3-8% transition loss

– Storage cavity conditioning

● New cavities not yet up to voltage

– WCM rebucket error

– Booster B3 RF cavity● 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?

Heavy Ion Run Update 5/3-4● Collisions established

– 79x79, 1e11

● Initial collimation complete

● 10 Hz feedback running

● Gap cleaning operational


● Repair made, opened vacuum during maintenance today

– Misc elog issues● Ramp efficiency entry● RatView scales

– Booster B3 RF cavity

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?

Heavy Ion Run Update 5/2-3● 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


● 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

● Outstanding items– Injection efficiency

● Lower than normal injection● Limits injected intensity


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

Heavy Ion Run Update 4/28-29/11● PHENIX zero field run

completed, settings reverted.

● Second set of vernier scans conducted.

● Power dip 1550-0030– Booster, AGS ring accesses

required




– 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

Heavy Ion Run Update 4/27-28/11● PHENIX zero field run

under way.




– Vernier scans

Run-10 Au-Au

Run-11 Au-Au

Next 24 hours 4/28-29● Resume normal stores● Continue Physics

– Store length = 30 min● More vernier scans● AP shifts: on call


Heavy Ion Run Update 4/26-27/11● 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


● Limits injected intensity

– Orbit control● High RMS since hysteresis


– Vernier scans

Next 24 hours 4/27-28● 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

Heavy Ion Run Update 4/25-26/11● 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.


● Limits injected intensity

– Orbit control● Can we correct orbit drift?

Should we?● BPM issues?


– Vernier scans

– bo6-qs3 failure


– Store length = 30 min● 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

● Outstanding items– Beam lifetime

– Injection efficiency● Limits injected intensity

– Orbit control


– Vernier scans

– bo6-qs3 failure

– Instrumentation setup● IPM, WCM


– Store length = 30 min● 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

● Outstanding items– Bunched beam lifetime


– 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

● Outstanding items– Tunes far from design

– Corrector strength/avg offset too high?

– Booster B3 RF, AGS bunch merge

RHIC operations

Injector performance

ATR transport

Next 24 hours 4/21-22● 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

Next 24 hours 4/20-21● 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

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