Abstract
Towards the end of LHC Run1, gas leaks were observed in some parts of the Transition Radiation Tracker (TRT) of ATLAS. Due to these leaks, primary Xenon based gas mixture was replaced with Argon based mixture in various parts. Test-beam studies with a dedicated Transition Radiation Detector (TRD) prototype were carried out in 2015 in order to understand transition radiation performance with mixtures based on Argon and Krypton. We present and discuss the results of these test-beam studies with different active gas compositions.
Highlights
Transition Radiation Tracker (TRT) is the outermost part of the ATLAS Inner Detector
We examine the TR detection performance the transition radiation detector (TRD) prototype filled with different gas mixtures based on Xenon, Krypton, and Argon.The results of some other studies performed with the TRD prototype can be found in [2], [3] presented at this Conference
The probability to exceed threshold for electron vs pion plots were produced for different gas and radiator combinations
Summary
TRT is the outermost part of the ATLAS Inner Detector. It is a gaseous tracker system consisting of 300 000 small diameter (4 mm) drift tubes called straws. We examine the TR detection performance the transition radiation detector (TRD) prototype filled with different gas mixtures based on Xenon , Krypton, and Argon.The results of some other studies performed with the TRD prototype can be found in [2], [3] presented at this Conference. 2. Motivation Of The Study With Krypton Gas Mixture The TR spectrum is roughly from 4 keV to 20 keV and in this energy range the Xenon absorption cross-section is higher than Argon and Krypton for photons up to 14 keV.
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