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PHOBOS Run 5 Readiness

PHOBOS Run 5 Readiness. Peter Steinberg / Robert Pak Brookhaven National Laboratory November 24, 2004. Run Preparation. Work left to be done in preparation for Cu-Cu physics run Several successful dry runs with new DAQ system Detector system is operational Current shift schedule

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PHOBOS Run 5 Readiness

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  1. PHOBOSRun 5 Readiness Peter Steinberg / Robert PakBrookhaven National Laboratory November 24, 2004

  2. Run Preparation • Work left to be done in preparation for Cu-Cu physics run • Several successful dry runs with new DAQ system • Detector system is operational • Current shift schedule • Shifts start Nov 29 @ 3pm.

  3. Physics Goals/Needs for Run 5 • Physics goals for planned Cu-Cu run • Energy and centrality dependence for • 4p observables (multiplicities, flow) • Particle spectra • Needs (Cu-Cu) • ~ 1 Billion events @ 200 GeV (1.5-4 nb-1 or 2+8 weeks) • ~ 150 Million events @ 62.4 GeV (2 weeks) • 1 day @ 22.4 GeV (injection)

  4. Run Conditions • Required run conditions to achieve goals – luminosity, b* etc. • Assuming b*=3m for 200 GeV as last year • Special requests: • Fixed-length stores are clearly optimal for overall operation of PHOBOS. • We would like additional time (e.g. 45 minutes) in a store if there is a substantial (>30 min) vacuum breakdown. • PHOBOS magnet has three states: even amount of data in each polarity and 10% field off. • (pp): Special 400 GeV run as early as possible.

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