The first precision drift tube chambers for the ATLAS muon spectrometer

Extensive performance studies for the ATLAS BIS-MDT precision muon chambers with cosmic rays

“…The double peak in the time distribution is explained by the corresponding double peak of the electron drift velocity, as the event number at a time is proportional to the drift velocity ( ). The physical time window 4 , which corresponds to hits induced by muons, is characterized by the start point (half of the rise time-leading edge), the end point (half of the falling time-trailing edge) and the width defined as . The value of 5 , which is determined from the fit does not depend edge).…”

“…The setup consists of a hodoscope [3], which serves as a trigger system and the BIS-MDT chamber [4]. The hodoscope (1.05 1.07 ) covers almost completely the muon chamber and it provides the transverse and longitudinal coordinate of the incident muon for the pattern recognition, for the track reconstruction and for the correction of the signal propagation 0018-9499/03$17.00 © 2003 IEEE along the wire.…”

Drift properties of the ATLAS MDT chambers

“…The BIS-MDT chamber Module-0 [1,2] was used in a cosmic ray setup to verify that the requirements of the ATLAS Muon Spectrometer [3] are fulfilled [4]. The BIS-MDT chamber consists of two multilayers composed of four layers each.…”

Extensive performance studies for the ATLAS BIS-MDT precision muon chambers with cosmic rays

“…The double peak in the time distribution is explained by the corresponding double peak of the electron drift velocity, as the event number at a time is proportional to the drift velocity ( ). The physical time window 4 , which corresponds to hits induced by muons, is characterized by the start point (half of the rise time-leading edge), the end point (half of the falling time-trailing edge) and the width defined as . The value of 5 , which is determined from the fit does not depend 3 In this distribution, 230 out of 240 drift tube maximum times were plotted.…”

“…As this was explained as an electronic effect (cross talk problem), the worst cases were not taken into account. 4 The physical time window is defined by the point t (half of the rise timeleading edge), which is related to the tube resolution and affected by the diffusion and clustering effects and the end point t (half of the falling time-trailing edge). As there are hits coming earlier than t , which are also induced by cosmic muons, we define the actual time window as the time window-between the first and the last hit.…”