Performance of a new LMRPC prototype for the STAR MTD system

• DOI: 10.1016/j.nima.2011.03.012
• Publication Date: 2011-04-14T21:49:45Z
• Authors: Y. Wang; H.S. Chen; W.C. Ding; X.Z. Qiu; J.B. Wang; X.L. Zhu; K.J. Kang; J.P. Cheng; Y.J. Li; L. Ruan; Z. Xu; K. Asselta; W. Christie; C. D'Agostino; J. Dunlop; J. Landgraf; T. Ljubicic; J. Scheblein; R. Soja; A.H. Tang; T. Ullrich; H.J. Crawford; J. Engelage; M. Calderon de la...; R. Reed; H.D. Liu; J. Butterworth; G. Eppley; F. Geurts; W.J. Llope; D. McDonald; T. Nussbaum; J. Roberts; K. Xin; L. Bridges; J.C. Li; S. Qian; Z. Ning; H.F. Chen; B.C. Huang; C. Li; M. Shao; Y.J. Sun; Z.B. Tang; X.L. Wang; Y.C. Xu; Z.P. Zhang; H. Zeng; Y. Zhou; R. Clarke; S. Mioduszewski; A. Davila; G.W. Hoffmann; L. Li; C. Markert; L. Ray; J. Schambach; D. Thein; M. Wada; Z. Ahammed; P.P. Bhaduri; S. Chattopadhyay; A.K. Dubey; M.R. Dutt-Mazumdar; P. Ghosh; S.A. Khan; S. Muhuri; B. Mohanty; T.K. Nayak; S. Pal; R. Singaraju; V. Singhal; P. Tribedy; Y.P. Viyogi
• Keywords: Freon; STRIPS; Butane; Resistive touchscreen

A new prototype of a Long-Strip Multi-Gap Resistive Plate Chamber (LMRPC) for the STAR Muon Telescope Detector (MTD) at RHIC has been developed. This prototype has an active area of 52 x 90 cm(2) and consists of six 250 mu m wide gaps. Each detector has 12 strips, read-out at both ends, which are each 3.8 cm wide and 90 cm long with 0.6 cm intervals. In cosmic-ray tests, the efficiency was larger than 95% and the time resolution was similar to 75 ps for the 94% Freon, 5% iso-butane, and 1% SF6 gas mixture. There was good uniformity in the performance across the different strips. The module was also tested in a proton beam at IHEP in Beijing. The efficiency was close to 100% and the best timing resolution achieved was 55 ps for the 90% Freon, 5% iso-butane, and 5% SF6 gas mixture. Trigger scans along and across the strip direction were also performed. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.