Run 10 medium energy running update
This presentation is the property of its rightful owner.
Sponsored Links
1 / 7

Run-10 Medium-Energy Running Update PowerPoint PPT Presentation


  • 91 Views
  • Uploaded on
  • Presentation posted in: General

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).

Download Presentation

Run-10 Medium-Energy Running Update

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


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


  • Login