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Run-10 Medium-Energy Running Update. Stefan Bathe for PHENIX RHIC Machine-Experiment Meeting 3/30/2010. Excellent Performance @ 62 GeV Both RHIC & PHENIX. Original goal after 4 weeks. Delivered (PHENIX on). 50 minutes. Recorded (PHENIX on).

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run 10 medium energy running update

Run-10 Medium-Energy RunningUpdate

Stefan Bathe for PHENIX

RHIC Machine-Experiment Meeting

3/30/2010

excellent performance @ 62 gev both rhic phenix
Excellent Performance @ 62 GeV Both RHIC & PHENIX

Original goal

after 4 weeks

Delivered

(PHENIX on)

50 minutes

Recorded

(PHENIX on)

Time between Stores (with PHENIX DAQ live [minutes]

2 minutes

Run # consecutive

Run # not consecutive

Time between Runs (with PHENIX DAQ live [minutes]

  • Performance twice better than expected
    • 375 M / 400 M events after 12/28 days
  • What to do with this?

RHIC Machine/Experiment Meeting

proposal part 1
Proposal—Part 1
  • End 62.4 GeV run one week early (after 3 weeks)
  • What do we get?
    • About 600 M minimum bias events
    • Will assure good data set for HBD dilepton measurement
    • Measurement of J/ψ suppression to test recombination models
    • Saves one week of running time

RHIC Machine/Experiment Meeting

j meaurement at 62 gev
J/ψMeaurement at 62 GeV
  • Expect about 80 J/ψ per 100 M min. bias events (both muon arms combined)
  • In three weeks of running
    • 600 M min. bias events (recorded)
    • 500 J/ψ
  • Measure J/ψ suppression at 62.4 GeV
  • Recombination models (Rapp et al.)
    • J/ψ yield at 200 GeV dominated by recombination
    • predict much larger suppression at 62 GeV than at 200 GeV
      • J/ψ yield down 1/3 at 62 GeV
      • Recombination down 1/10
  • Extremely interesting test of recombination models
  • From 50 M min. bias events
  • # of J/ψ consistent w/ expectation (from 62 GeVCu+Cu)
proposal part 2
Proposal—Part 2
  • What to do with the saved week?
  • Proposal to add it to 39 GeV part of run
  • What will that gain us?
  • HBD dilepton measurement that was not thought to be possible at time of PAC Meeting

RHIC Machine/Experiment Meeting

dilepton measurement at 39 gev
Dilepton Measurement at 39 GeV
  • Adding 1 week increases running time by 2/3 (1.5 weeks  2.5 weeks)
  • Previous estimate: record 50 M min. bias events
  • Updated estimate: record 200 M min. bias events
    • excellent performance and increased running time
    • 30 M per day at 62 GeV; E^2 scaling: 12 M at 39 GeV
  • Will allow dilepton measurement with HBD at 39 GeV(not thought possible at time of PAC meeting)

How do dilepton excess and ρ modification at SPS

evolve into the large low-mass excess at RHIC?

RHIC Machine/Experiment Meeting

summary of proposal
Summary of Proposal
  • End 62 GeV run one week early
    • Measurement of J/ψ suppression at 62 GeV to test recombination models
    • 500 J/p from 600 M minimum bias events in 3 weeks
  • Use available week for 39 GeV run
    • Dilepton measurement at 39 GeV with HBD
    • 200 M events in 2.5 weeks
    • How do dilepton excess and modification at SPS evolve into large low-mass excess at RHIC?

RHIC Machine/Experiment Meeting