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?

Next 48 hours 6/22-24 ● Continue Physics – Store length? Optimal ~1 hour. – Can detectors remain on? ● Status meetings M-W-F

Heavy Ion Run Update 6/17-6/20 ● Physics running, 12 stores – 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 ● Status meetings M-W-F

Heavy Ion Run Update 6/15-6/17 ● Physics running, 6 stores – 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 ● Storage cavity voltage calibration – Blue cavities – Requires working Blue longitudinal Schottky

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 ● √S NN = 27 GeV beam development starts Monday 1600 ● Status meetings M-W-F

Heavy Ion Run Update 6/13-6/15 ● Physics running, 10 stores – 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 ● Blue injection efficiency ● Storage cavity voltage calibration – Blue cavities – Requires working Blue longitudinal Schottky

Next 48 hours 6/13-15 ● LLRF firmware upgrade – Dump at 0900 tomorrow to begin ● AnDY ZDC calibration – 2 stores following LLRF work ● Continue Physics ● √S NN = 27 GeV beam development next Monday ● Status meetings M-W-F

Heavy Ion Run Update 6/10-6/13 ● Physics running, 14 stores – 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

Next 48 hours 6/13-15 ● 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. ● √S NN = 27 GeV beam development next Monday ● Status meetings M-W-F

Heavy Ion Run Update 6/8-6/10 ● Physics running, 4 stores – 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 ● LLRF firmware upgrade – 4 hrs, week of 6/13 ● AnDY ZDC calibration

Weekend outlook 6/10-13 ● Access for PHENIX RPC issues. ● Continue Physics – Continue fine tuning cooling for best performance. ● NOTE plan to run at √S NN = 27 GeV ● Status meetings M-W-F

Heavy Ion Run Update 6/6-6/8 ● Physics running, 9 stores – 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 ● Blue injection efficiency ● Storage cavity voltage calibration – Blue cavities ● LLRF firmware upgrade – 4 hrs, week of 6/13

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

Heavy Ion Run Update 6/3-6/6 ● Physics running, 14 stores – 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 calibration – Blue cavities ● LLRF firmware upgrade – 4 hrs, week of 6/13 ● 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 – 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 ● LLRF firmware upgrade – 4 hrs, week of 6/13 ● Stochastic cooling issues – BL kicker drive repair – BV not yet operational

New RF voltage calibrations

Present Yellow working point Run-10 Yellow working point

Weekend outlook 6/3-6 ● Restore stochastic cooling systems – Requires additional access – PHENIX access concurrently ● Continue Physics – Vernier scans Friday: early in store ● Status meetings M-W-F

Heavy Ion Run Update 5/27-6/1 ● Physics running, 19 stores – 5 failed ramps ● Early loss attributed to y-qtrim? ● Yellow RF trip on ramp ● Fast Blue loss ~10 sec after γ t (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 ● LLRF firmware upgrade – 4 hrs, week of 6/13 ● 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 ● Status meetings M-W-F

Heavy Ion Run Update 5/23-25 ● APEX completed Wednesday – Attempt at fixing post-γ t 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 γ t – 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 ● LLRF firmware upgrade – 4 hrs, week of 6/13

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

Heavy Ion Run Update 5/20-23 ● Physics running, 14 stores – 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 ● Status meetings M-W-F ● AP shifts: on call –...but be prepared to log in remotely or come in if necessary.

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, BL YL, VL, YV, BV YL, BL, YV, BV YL, 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 – Ramp Efficiency ● Ramp quicker after fill – More beam ● Status meetings M-W-F ● AP shifts: on call –...but be prepared to log in remotely or come in if necessary.

Heavy Ion Run Update 5/16-18 ● Physics running, 7 stores – 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

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? – Ramp Efficiency ● Ramp quicker after fill – More beam ● Status meetings M-W-F ● AP shifts: on call –...but be prepared to log in remotely or come in if necessary.

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 ● Outstanding items – Blue injection efficiency – Booster B3 RF, deferred 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 –...but be prepared to log in remotely or come in if necessary.

Heavy Ion Run Update 5/12-13 ● Physics running, 5 stores – 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 – Booster B3 RF, deferred troubleshooting – YS5, BS5 cavity conditioning ● 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 –...but be prepared to log in remotely or come in if necessary.

Heavy Ion Run Update 5/10-12 ● Physics running, 4 stores ● Stochastic cooling setup continues ● APEX ● Maintenance – YA2 opened, repaired – YS4, BS4 cavities in operation – LLRF failure post- maintenance ● Outstanding items – Blue injection efficiency ● Better, but still variable – Booster B3 RF, deferred troubleshooting – Vernier scans – YS5, BS5 cavity conditioning ● More conditioning for YS4, BS4?

Stores since Tuesday

Injection efficiency

IR4 Vacuum

Next 24 hours 5/11-12 ● 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 ● Transition efficiency – chromaticity? Yellow dipole feedback? ● More vernier scans? ● Meeting tomorrow noon in LCR. ● AP shifts: on call –...but be prepared to log in remotely or come in if necessary.

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 ● Stochastic cooling setup continues ● Outstanding items – YA2 cavity – AGS extraction efficiency – Blue injection efficiency – Booster B3 RF, deferred troubleshooting – Vernier scans – YS4, YS5, BS4, BS5 cavity conditioning

Next 24 hours 5/10-11 ● Continue Physics – Reduce store length w/o cooling? ● Stochastic cooling setup – Every possible store ● 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 ● Maintenance ● NO MEETING TOMORROW ● AP shifts: on call –...but be prepared to log in remotely or come in if necessary.

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 ● Stochastic cooling setup continues ● Outstanding items – YA2 cavity – AGS extraction efficiency – Booster B3 RF, deferred troubleshooting – 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? ● Stochastic cooling setup – Every possible store ● 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 –...but be prepared to log in remotely or come in if necessary.

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 ● Outstanding items – YA1 cavity ● 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 injection, store – Tune/coupling/orbit feedback employed – Tune/coupling replay exercised – Ramp chromaticity measurement ● Outstanding items – 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 ● Outstanding items – Injection efficiency ● Lower than normal injection ● Limits injected intensity – Booster B3 RF, deferred troubleshooting

Next 24 hours 5/2-3 ● Injection beam development ● PS ramp testing, Booster B3 RF troubleshooting ~ 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 – Booster, AGS ring accesses required ● Outstanding items – Injection efficiency ● Lower than normal injection ● Limits injected intensity – Booster B3 RF, deferred troubleshooting – Vernier scans

Weekend 4/29-5/2 ● Continue Physics – Store length = 30 min ● Last vernier scans ● APEX Monday ● √s NN =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. ● Outstanding items – Injection efficiency ● Lower than normal injection ● Limits injected intensity – Booster B3 RF, deferred troubleshooting – 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 –...but be prepared to log in remotely or come in if necessary.

Heavy Ion Run Update 4/26-27/11 ● Initial vernier scans completed – Optimized PHENIX, repositioned STAR ● Booster beamstop failure – Replaced bo6-qs3, yi6-sx3 – Repaired bi8-qf3 – Sublimated sector 4 vacuum ● Outstanding items – Injection efficiency ● Limits injected intensity – Orbit control ● High RMS since hysteresis – Booster B3 RF, deferred troubleshooting – 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. ● Outstanding items – Injection efficiency ● Limits injected intensity – Orbit control ● Can we correct orbit drift? Should we? ● BPM issues? – Booster B3 RF, deferred troubleshooting – Vernier scans – bo6-qs3 failure

Next 24 hours 4/26-27 ● Continue Physics – Store length = 30 min ● Schedule vernier scans ● AP shifts: on call –...but be prepared to log in remotely or come in if necessary.

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 – Booster B3 RF, deferred troubleshooting – Vernier scans – bo6-qs3 failure – Instrumentation setup ● IPM, WCM

Next 24 hours 4/25-26 ● Continue Physics – 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 –...but be prepared to log in remotely or come in if necessary.

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 – Booster B3 RF, deferred 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 ● 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 – f RF at 9 GeV: MHz – f RF at 9.8 GeV normal injection: MHz – Cavity lower limit: 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