1 PHENIX Status Ed O’Brien for John Haggerty Brookhaven National Laboratory June 23, 2009

Physics running week 9 of 10 It has been a good week Accumulated luminosity in good physics runs with ±30 cm vertex cut (~50% acceptance) is about 14.5 pb -1 –2X Run-6 p+p long. Polarized data set Last week we recorded 2.0 pb -1 So far in Run-9 p+p 200 GeV –315 G events sampled –8.3 G events recorded –365 TB of physics data > 0.5 Pbytes 200 GeV+500 Gev data sets 2

Outstanding Issues Is the yellow polarization dropping? June 23, Polarization numbers still seem to be varying outside errors at least in some of the polarimeters… may not be sure of polarization until after further polarimeter analysis… or is it intensity or orbit effect?

Outstanding Issues Rack room air conditioning The rack room air conditioner failed Friday night… –The main HVAC unit failed –2 smaller back-up units can not keep up Hanging on with doors open and fans blowing Could go off at any time Second compressor failure since March No redundancy June 23, ºF 70ºF

Summary RHIC+PHENIX performance in the last week has been very good Chronic HVAC problems in PHENIX persist. Need a long term solution. –Smaller problem with the compressed air feed from the RHIC tunnel that we need fixed. Is the yellow polarization OK, or is is there a degradation? Looking forward to a good upcoming week and the final 6 days of p+p s ½ = 200 GeV