/ Instrumentation physics/0701122


The Outer tracker detector of the HERA-B experiment. Part III. Operation and performance


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

Published in: Nucl.Instrum.Meth.
Year: 2007
Vol.: A576
Page No: 312-330
Pages: 37

Abstract: In this paper we describe the operation and performance of the HERA-B Outer Tracker, a 112674 channel system of planar drift tube layers. The performance of the HERA-B Outer Tracker system fullfilled all requirements for stable and efficient operation in a hadronic environment, thus confirming the adequacy of the honeycomb drift tube technology and of the front-end readout system. The detector was stably operated with a gas gain of 30000 in an Ar/CF4/CO2 (65:35:5) gas mixture, yielding a good efficiency for triggering and track reconstruction, larger than 95 % for tracks with momenta above 5 GeV/c. The hit resolution of the drift cells was 300 to 320 micrometers and the relative momentum resolution can be described as: sigma(p)/p (in %) = (1.61 +- 0.02) + (0.0051 +- 0.0006) p. At the end of the HERA-B running no aging effects in the Outer Tracker cells were observed.

Keyword(s): Drift chamber ; Gas gain ; Calibration ; Alignment ; Efficiency ; Resolution

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