Author/Authors :
Braem، نويسنده , , A. and Colonna، نويسنده , , N. and Davenport، نويسنده , , M. and Di Bari، نويسنده , , D. and Di Mauro، نويسنده , , A. and Elia، نويسنده , , D. and Fini، نويسنده , , R. and Galantucci، نويسنده , , L. and Ghidini، نويسنده , , B. and Goret، نويسنده , , B. and Grimaldi، نويسنده , , A. and Monno، نويسنده , , E. and Nappi، نويسنده , , E. and Paic، نويسنده , , G. and Piuz، نويسنده , , F. and Posa، نويسنده , , F. and Raynaud، نويسنده , , J. and Santiard، نويسنده , , J.C. and Stucchi، نويسنده , , S. and Tomasicchio، نويسنده , , G. and Williams، نويسنده , , T.D.، نويسنده ,
Abstract :
The particle identification in A Large Ion Collider Experiment (ALICE) at LHC will be achieved by two complementary systems based on time-of-flight measurement, at low pt, and on the Ring Imaging Cherenkov (RICH) technique, at pt ranging from 2 to 5 GeV/c, respectively. The High Momentum PID (HMPID) system will cover ∼5% of the phase space, the single-arm detector array being composed by seven 1.3×1.3 m2 CsI-RICH modules placed at 4.7 m from the interaction point where a density of about 50 particles/m2 is expected.
prototype, 23 of HMPID module size, has been successfully tested at the CERN/PS beam where 18 photoelectrons per event have been obtained with 3 GeV/c pions and 10 mm liquid C6F14 radiator. Mechanical problems related to the liquid radiator vessel construction have been solved and the prototype, fully equipped, will be tested at the CERN/SPS to investigate the PID capability in high particle density events.
s report, after an introductory discussion on the requirements for PID in ALICE, the HMPID prototype is described and the main results of beam tests on large area CsI photocathodes, operated in RICH detectors, are given.
