Title :
Drift properties of monitored drift tubes chambers of the ATLAS muon spectrometer
Author :
Cirilli, Manuela
Author_Institution :
CERN, Geneva, Switzerland
Abstract :
The ATLAS Muon Spectrometer relies on monitored drift tube (MDT) chambers for precision tracking. In standard conditions, MDTs operate with an Ar 93%-CO2 7% mixture at 3 bar absolute pressure. Any variation of the gas mixture has an impact on the detector performance. During a beam test at CERN in the summer 2002, the drift properties of several production MDT chambers were studied as a function of temperature, composition of the gas mixture, water vapor content, applied voltage and discriminator threshold. A second beam test still at CERN in July 2002 was devoted to studying the performance of MDT chambers in the presence of a high photon background.
Keywords :
argon; calibration; carbon compounds; drift chambers; gamma-ray detection; gas mixtures; ionisation chambers; muon detection; particle spectrometers; position sensitive particle detectors; testing; 3 bar; ATLAS muon spectrometer; Ar-CO2; Ar-CO2 mixture; CERN; MDT chambers; absolute pressure; applied voltage; beam test; calibration; composition function; discriminator threshold; drift properties; gas detector performance; gas mixture; high photon background; ionization chambers; monitored drift tube chambers; precision tracking; second beam test; temperature function; water vapor content; Argon; Detectors; Mesons; Monitoring; Production; Spectroscopy; Temperature; Testing; Threshold voltage; Water; Calibration; gas detectors; ionization chambers;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.2004.835564
