CERN Accelerating science

ATLAS Note
Report number	ATL-MUON-2004-002
Title	Resolution and Efficiency of Monitored Drift-Tube Chambers with Final Read-out Electronics at High Background Rates
Author(s)	Dubbert, J ; Horvat, S ; Kortner, O ; Kroha, H ; Manz, A ; Mohrdieck-Möck, S ; Rauscher, F ; Richter, R ; Staude, A ; Stiller, W
Publication	2003
Imprint	23 Dec 2003
Number of pages	19
Subject category	Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN LHC ; ATLAS
Free keywords	ADC ; ASD ; MDT ; drift ; efficiency ; electronics ; final ; read-out ; resolution ; slewing ; time ; time-slewing ; tube
Abstract	The performance of a monitored drift-tube chamber for ATLAS with the final read-out electronics was tested at the Gamma Irradiation facility at CERN under varyin photon irradiation rates of up to 990 Hz\,cm$^{-2}$ which corresponds to 10 times the highest background rate expected in ATLAS. The signal pulse-height measurement of the final read-out electronics was used to perform time-slewing corrections. The corrections improve the average single-tube resolution from 106 $\mu$m to 89 $\mu$m at the nominal discriminator threshold of 44 mV without irradiation, and from 114 $\mu$m to 89 $\mu$m at the maximum nominal irradiation rate in ATLAS of 100 Hz\,cm$^{-2}$. The reduction of the threshold from 44 mV to 34 mV and the time-slewing corrections lead to an average single-tube resolution of 82 $\mu$m without photon background and of 89 $\mu$m at 100 Hz\,cm$^{-2}$. The measured muon detection efficiency agrees with the expectation for the final read-out electronics.
Copyright/License	Preprint: (License: CC-BY-4.0)

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