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LHCb Note
Report number	LHCb-2000-062
Title	Performance study of a MWPC prototype for the LHCb muon system with the ASDQ chip
Author(s)	Kashchuk, A (CERN) ; De Paula, L S ; Riegler, W (CERN) ; Schmidt, B (CERN) ; Schneider, T (CERN)
Submitted by	[email protected] on 14 Aug 2000
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; LHCb
Free keywords	ASDQ chip ; MWPC
Abstract	We report results from a beam test evaluating the front­end electronics for Multi­Wire­Proportional­Chambers (MWPCs) for the LHCb Muon System. The ASDQ chip with an adaption fulfils the requirements for the detectors in the entire Muon System. A time resolution of 3.2 ns at an operating voltage 3.15 kV was achieved with the gas mixture Ar(40%)CO 2 (50%)CF 4 (10%), translating into an efficiency of 99.5% for a 20 ns time window. An efficiency of more than 95% in a 20 ns time window is obtained for voltages above 2.95kV for all types of pads studied. Hence, the efficiency plateau is about 500 Volts.
Copyright/License	Preprint: (License: CC-BY-4.0)

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