Abstract
The ALICE HMPID (High Momentum Particle IDentification) detector has been designed to identify charged pions and kaons in the range 1 ÷ 3 GeV/c and protons in the range 1.5 ÷ 5 GeV/c . It consists of seven identical proximity focusing RICH (Ring Imaging Cherenkov) counters, covering in total 11 m 2, which exploit large area MWPC equipped with CsI photocathodes for Cherenkov light imaging emitted in a liquid C 6F 14 radiator. The ALICE detector has been widely commissioned using cosmics and LHC beam from December 2007 until October 2008. During the cosmics data taking the HMPID detector collected a large set of data, using mainly the trigger provided by the TOF detector. We present here preliminary results of detector alignment using TPC tracking. The HMPID could be operated in a stable way, at a safe HV setting, also during LHC beam injection and circulation tests, when a very large occupancy (up to 50%) was achieved. Resulting gain mapping and overall detector performance will also be discussed.
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