The outer tracker detector of the HERA-B experiment - Part I: Detector

H. Albrecht, Th.S. Bauer, M. Beck, K. Berkhan, G. Bohm, M. Bruinsma, T. Buran, M. Capeans, B.X. Chen, H. Deckers, A. Donat, X. Dong, R. Eckmann, D. Emelianov, G. Evgrafov, I. Golutvin, U. Harder, M. Hohlmann, K. Höpfner, W. HulsbergenY. Jia, C. Jiang, H. Kapitza, S. Karabekyan, Z. Ke, Y. Kiryushin, H. Kolanoski, D. Krücker, A. Lanyov, Y.Q. Liu, T. Lohse, H. Lüdecke, R. Mankel, G. Medin, E. Michel, A. Moshkin, J. Ni, S. Nowak, M. Ouchrif, C. Padilla, R. Pernack, A. Petrukhin, D. Pose, B. Schmidt, W. Schmidt-Parzefall, A. Schreiner, H. Schröder, U. Schwanke, A.S. Schwarz, I. Siccama, K. Smirnov, S. Solunin, S. Somov, V. Souvorov, A. Spiridonov, C. Stegmann, O. Steinkamp, N. Tesch, I. Tsakov, U. Uwer, S. Vassiliev, D. Vishnevsky, I. Vukotic, M. Walter, J.J. Wang, Y.M. Wang, R. Wurth, J. Yang, Z. Zheng, Z. Zhu, R. Zimmermann

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The HERA-B Outer Tracker is a large system of planar drift chambers with about 113 000 read-out channels. Its inner part has been designed to be exposed to a particle flux of up to 2×105cm-2s-1, thus coping with conditions similar to those expected for future hadron collider experiments. Thirteen superlayers, each consisting of two individual chambers, have been assembled and installed in the experiment. The stereo layers inside each chamber are composed of honeycomb drift tube modules with 5 and 10mm diameter cells. Chamber aging is prevented by coating the cathode foils with thin layers of copper and gold, together with a proper drift gas choice. Longitudinal wire segmentation is used to limit the occupancy in the most irradiated detector regions to about 20%. The production of 978 modules was distributed among six different laboratories and took 15 months. For all materials in the fiducial region of the detector good compromises of stability versus thickness were found. A closed-loop gas system supplies the Ar/CF4/CO2 gas mixture to all chambers. The successful operation of the HERA-B Outer Tracker shows that a large tracker can be efficiently built and safely operated under huge radiation load at a hadron collider. © 2005 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)310-323
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume555
Issue number1-2
DOIs
Publication statusPublished - 15 Dec 2005
Externally publishedYes

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