The gain of a multiwire proportional chamber (MWPC) of the LHCb muon detector was measured precisely. The chamber, filled with a CO2/Ar/CF4 gas mixture, 55/40/5% in volume, was irradiated with a 1.3 GBq Cs-137 radioactive source and the current drawn by the chamber was measured. By precisely determining the primary ionization current it was possible to evaluate the absolute gain of the chamber. The dependence of the gain on the anode voltage and the gas density was measured and the need for a gain control system during the LHCb data taking is considered. Our experimental results are compared with those predicted for the chamber gain by Diethorn formula. (c) 2007 Elsevier B.V. All rights reserved.
Detailed study of the gain of the MWPCs for the LHCb muon system / E., Dane; Penso, Gianni; D., Pinci; Sarti, Alessio. - In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT. - ISSN 0168-9002. - 572:2(2007), pp. 682-688. [10.1016/j.nima.2006.12.026]
Detailed study of the gain of the MWPCs for the LHCb muon system
PENSO, Gianni;SARTI, ALESSIO
2007
Abstract
The gain of a multiwire proportional chamber (MWPC) of the LHCb muon detector was measured precisely. The chamber, filled with a CO2/Ar/CF4 gas mixture, 55/40/5% in volume, was irradiated with a 1.3 GBq Cs-137 radioactive source and the current drawn by the chamber was measured. By precisely determining the primary ionization current it was possible to evaluate the absolute gain of the chamber. The dependence of the gain on the anode voltage and the gas density was measured and the need for a gain control system during the LHCb data taking is considered. Our experimental results are compared with those predicted for the chamber gain by Diethorn formula. (c) 2007 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
