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Update from PHOBOS Run at Brookhaven National Lab - Latest Data, Si Problems, and Future Goals

Stay informed on the recent developments in PHOBOS experiment at Brookhaven National Lab, including data breakdown, Si system issues, and upcoming objectives for event collection. Learn about expert interventions, access requests, and planned energy runs.

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Update from PHOBOS Run at Brookhaven National Lab - Latest Data, Si Problems, and Future Goals

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  1. PHOBOSRun 5 “Progress” Peter SteinbergBrookhaven National Laboratory February 2, 2005

  2. This Week in Chipmunk 2 • One breakdown – no major loss of data

  3. Run Statistics Last Week 400Mevents? ~4nb-1 deliveredfrom RHIC = 1.6B (25% efficiency) Goals: 1B events(as for every run!)Expecting:400-500M events Polarity flips once/day

  4. Run Statistics This Week 400Mevents? ~4nb-1 deliveredfrom RHIC = 1.6B (25% overallefficiency) Goals: 1B events(as for every run!)Expecting:400-500M events Polarity flips still once/day

  5. Si Problems • Over weekend, frequent DAQ hangups related to silicon system raising busy • Workaround possible until Monday night, when system stopped responding  Crisis • Tues. we brought in expert from MIT • Ferry schedules etc.  4:30pm • Work overnight Tues 6pm  Weds 4am with some accesses • Returned to work 10am, requested access  none granted yet • This morning: reviewed progress and desired work in tunnel • Bottom line: 1 hour requested ASAP

  6. Si Problem: History & Plan Each configuration needs ~ ½hr  1 hour request

  7. Phil’s Questions • We could use factor of 2 in luminosity, but would only contribute up to 30% increase in total events • Desirable but not crucial • We strongly prefer uptime vs. lumi development • We are not running any rare triggers • However, we will not stand in the way of other experiments, provided quantitative case is made • Strongly request low energy run (62.4 GeV) • Part of PHOBOS BUP – approved by PAC • Need 2-3 weeks for useful spectra (pT out to 5 GeV), results comparable to 62.4 GeV Au+Au (accepted to PRL two weeks ago) • Strongly request 1 day injection energy • Similar run in Au+Au was very useful for all experiments

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