The ATLAS TRT end-cap detectors

Journal of Instrumentation (Impact Factor: 1.4). 10/2008; 3(10):P10003. DOI: 10.1088/1748-0221/3/10/P10003


The ATLAS TRT end-cap is a tracking drift chamber using 245,760 individual tubular drift tubes. It is a part of the TRT tracker which consist of the barrel and two end-caps. The TRT end-caps cover the forward and backward pseudo-rapidity region 1.0 < |η| < 2.0, while the TRT barrel central η region |η| < 1.0. The TRT system provides a combination of continuous tracking with many measurements in individual drift tubes (or straws) and of electron identification based on transition radiation from fibers or foils interleaved between the straws themselves. Along with other two sub-system, namely the Pixel detector and Semi Conductor Tracker (SCT), the TRT constitutes the ATLAS Inner Detector. This paper describes the recently completed and installed TRT end-cap detectors, their design, assembly, integration and the acceptance tests applied during the construction.

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Available from: Vladimir Myalkovskiy, Dec 15, 2013

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Article: The ATLAS TRT end-cap detectors

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    • "The transition radiation tracker (TRT) [1] [2] is the combined gaseous detector occupying the outermost part of the inner detector of the ATLAS [3] – one of the two general purpose experiments at the Large Hadron Collider at CERN. The inner detector is located in the center of the ATLAS experiment, surrounding the beam interaction point. "
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    ABSTRACT: The transition radiation tracker (TRT) is the outermost of the three sub-systems of the ATLAS inner detector at the Large Hadron Collider (LHC) at CERN. It is designed to combine the drift tube tracker with the transition radiation detector, providing an important contribution to the charged particles precise momentum measurement and particle (mainly electron) identification. The TRT consists of a barrel section at small pseudorapidity (ηη) and two separate end-cap partitions at large ηη. The detector performance and its operational conditions were permanently monitored during all commissioning and data-taking stages using various software tools, one of which – TRTViewer – is described in the present paper. The TRTViewer is the dedicated program for monitoring the TRT raw data quality and detector performance at different hardware levels: individual straws, readout chips and electronic boards. The data analysis results can be presented on the event-by-event basis or in the form of color maps representing the operation parameters (efficiencies, timing, occupancy, etc.) according to the real geometrical position of the detector hardware elements. The paper describes the TRTViewer software package as the event displaying tool, raw data processor and histogram and operation parameters presenter, which works with the different sources of input information: raw data files, online monitoring histograms, offline analysis histograms and TRT DAQ Configuration database. The package proved to be one of the main instruments for the fast and effective TRT diagnostics during debugging and operation periods.
    Preview · Article · Aug 2012 · Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment
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    • "The TRT consists of three parts, a barrel [3] and two endcaps [4]. The barrel covers |η| < 1 and 16 is made of 52,544 straws 144 cm in length electrically split in the middle, with independent readout 17 at both ends. "
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    ABSTRACT: The Transition Radiation Tracker (TRT) is the outermost of the three subsystems in the ATLAS Inner Detector. It contributes significantly to the precision of the momentum mea-surement of charged particles and to the identification of electrons. This note reports about the commissioning and performance of the TRT with cosmic rays and the first high energy collisions at the LHC.
    Preview · Article · Nov 2010 · Journal of Instrumentation
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