The ATLAS TRT end-cap detectors

Journal of Instrumentation (Impact Factor: 1.53). 10/2008; 3(10):P10003. DOI: 10.1088/1748-0221/3/10/P10003

ABSTRACT 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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    ABSTRACT: The ATLAS Transition Radiation Tracker (TRT) is the outermost of the three sub-systems of the ATLAS Inner Detector at the Large Hadron Collider at CERN. It consists of close to 300000 thin-wall drift tubes (straws) providing similar to 30 measurements with position resolution of about 120 mu m for charged particle tracks with vertical bar eta vertical bar < 2 and p(T) > 0.5 GeV. Along with continuous tracking, it provides particle identification capability through the detection of transition radiation, X-ray photons generated by high momentum particles in the many polymer fibers or films that fill the spaces between the straws. Custom-built analog and digital electronic read-out are optimized to operate at the LHC design luminosity. In this article, a review of the commissioning and first operational experience of the TRT detector will be presented. Emphasis will be given to performance studies based on the reconstruction and analysis of proton-proton collision data collected at the LHC. In addition, the response of the TRT detector to the extremely high track density conditions encountered during the first heavy ion LHC collisons will be presented. (C) 2012 Published by Elsevier B. V. Selection and/or peer review under responsibility of the organizing committee for TIPP 11.
    Physics Procedia 01/2012; 37:506-514. DOI:10.1016/j.phpro.2012.02.396
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    ABSTRACT: The ATLAS Transition Radiation Tracker (TRT) is the outermost of the three sub-systems of the ATLAS Inner Detector at the Large Hadron Collider at CERN. With ~300000 drift tube proportional counters (straws) filled with stable gas mixture and high voltage biased it provides precise quasi-continuous tracking and particles identification. Safe, coherent and efficient operation of the TRT is fulfilled with the help of the Detector Control System (DCS) running on 11 computers as PVSS (industrial SCADA) projects. Standard industrial and custom developed server applications and protocols are used for reading hardware parameters. Higher level control system layers based on the CERN JCOP framework allow for automatic control procedures, efficient error recognition and handling and provide a synchronization mechanism with the ATLAS data acquisition system. Different data bases are used to store the detector online parameters, the configuration parameters and replicate a subset of them used to flag data quality for physics reconstruction. The TRT DCS is fully integrated with the ATLAS Detector Control System.
    Proceedings of SPIE - The International Society for Optical Engineering 05/2012; DOI:10.1117/12.2000242 · 0.20 Impact Factor
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    ABSTRACT: The design and manufacturing technology of a prototype coordinate detector module with dimensions of 2.0 × 0.5 m2 on the basis of 2-m-long drift straw tubes are described. The selected design and technology allow large-area detectors to be constructed from these modules. Results of the module testing at gas pressures of 1–4 bar are described. The characteristic features of the module are a small radiation thickness, a high radiation hardness, a high detection efficiency for charged particles, as well as the feasibility of its high granularity (using small-diameter straw tubes and segmentation along the tube length). The possibility of optimizing the operating conditions of the module over a wide range of the working gas pressure is shown.
    Instruments and Experimental Techniques 09/2013; 56:525-530. DOI:10.1134/S0020441213040155 · 0.35 Impact Factor

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