A large area timing RPC(大尺寸时间分辨RPC).pdf

Nuclear Instruments and Methods in Physics Research A 485 (2002) 328–342 A large area timing RP a,b a,c d a,e, d A. Blanco , R. Ferreira-Marques , Ch. Finck , P. Fonte *, A. Gobbi , A. Policarpoa,c, M. Rozasb a Universidade de Coimbra, LIP-Coimbra, Dep. De Fisica, 1-LIP, P-3004-516 Coimbra, Portugal b GENP, Dept. Fisica de Particulas, Univ. de Santiago de Compostella, Santiago de Compostella, Spain c ! Departamento de Fısica da Universidade de Coimbra, Coimbra, Portugal d GSI, Darmstadt, Germany e ISEC, Coimbra, Portugal Received 27 March 2001; received in revised form 27 September 2001; accepted 28 September 2001 Abstract 2 was built and tested. The A large area Resistive Plate Chamber (RPC) with a total active surface of 160 10 cm surface was segmented in two 5 cm wide strips readout on both ends with custom, very high frequency, front-end electronics. A timing resolution between 50 and 75 ps s with an efficiency for Minimum Ionizing Particles (MIPs) larger than 95% was attained over the whole active area, in addition with a position resolution along the strips of 1.2 cm. Despite the large active area per electronic channel, the observed timing resolution is remarkably close to the one previously obtained (50 ps s) with much smaller chambers of about 10 cm2 area. These results open perspectives of