CERN Accelerating science

Preprint
Report number	CERN-ALI-99-08 ; CERN-ALICE-PUB-99-08
Title	A large area CsI RICH Detector in ALICE at LHC
Edition	rev. version
Author(s)	Di Bari, D ; Cozza, D ; Davenport, Martyn ; Di Mauro, A ; Elia, D ; Ghidini, B ; Grimaldi, A ; Martinengo, P ; Monno, E ; Morsch, Andreas ; Nappi, E ; Paic, G ; Piuz, François ; Posa, F ; Santiard, Jean-Claude ; Stucchi, S ; Tomasicchio, G ; Williams, T D
Affiliation	(CERN)
Publication	1999
Imprint	19 Feb 1999
Number of pages	mult.
Presented at	6th International Conference on Advanced Technology and Particle Physics : ICATPP-6, Como, Italy, 5 - 9 Oct 1998
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ALICE
Keywords	HMPID ; chamber ; gas ; pad
Abstract	A 1m2 CsI RICH prototype has been successfully tested in a hadron beam at CERN SPS. The prototype, fully equipped with 15k electronic channels, has been used to identify particles coming from pi-Be interactions. Track reconstruction has been performed by using a telescope consisting of four gas pad chambers. A detailed description of the detector will be presented and results from the test will be discussed. List of figures Figure 1 Expected proton and antiproton yields including jet quenching mechanism in central Pb-Pb collisions at LHC. Figure 2 Schematic view of the HMPID CsI-RICH Figure 3 Experimental layout used at the SPS/H4 test beam Figure 4 Distributions of the mean number, per ring, of pad hits (Npad), electrons (Ntot) and Cherenkov photoelectrons (Nres) as a function of the single-electron mean pulse height Figure 5 Mean single-electron pulse height as a function of high voltage measured at the centre of each of the four photocathodes Figure 6 Evaluation of the uniformity of the chamber gain for the photocathode PC32 Figure 7 Azimuthal distribution of the photon pad hits in the Cherenkov fiducial zone (HV=2050 V) Figure 8 Photon angle (a) and track Cherenkov angle (b) distributions for beam events at the SPS Figure 9 Track density on the HMPID cathode plane in real 350 GeV/c pi--Be events Figure 10 Three dimensional display of an SPS 350 GeV/c pi--Be event. Eleven tracks are reconstructed in the telescope by requiring one hit on each pad chamber to reconstruct a track
Copyright/License	Preprint: (License: CC-BY-4.0)