Article

# A progress report on the development of the CsI-RICH detector for the ALICE experiment at LHC

DOI:http://cdsweb.cern.ch/record/331195/files/ppe-97-096.ps.gz
Source: OAI

ABSTRACT The particle identification in ALICE (A Large Ion Collider Experiment) at LHC will be achieved by two complementary systems based on time of flight measurement, at low $p_t$, and on the Ring Imaging Cherenkov (RICH) technique, at $p_t$ ranging from 2 to 5 GeV/$c$, respectively. The High Momentum PID (HMPID) system will cover $\sim$5\% of the phase space, the single arm detector array beeing composed by seven 1.3$\times$1.3 m$^2$ CsI-RICH modules placed at 4.7 m from the interaction point where a density of about 50 particles/m$^2$ is expected.\\ A 1 m$^2$ prototype, 2/3 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 $\mathrm{C}_6\mathrm{F}_{14}$ 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.\\ In this 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.

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2 Nov 2012

### Keywords

18 photoelectrons

3 GeV/c pions

complementary systems

flight measurement

HMPID

HMPID module size

HMPID prototype

interaction point

large area CsI photocathodes

Large Ion Collider Experiment

Mechanical problems

Momentum PID

particle density events.\\

particle identification

PID

PID capability

requirements

Ring Imaging Cherenkov

single arm detector array beeing