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Type: Journal article
Title: The technical performance of the HEGRA system of imaging air Cherenkov telescopes
Author: Puhlhofer, G.
Bolz, O.
Gotting, N.
Heusler, A.
Horns, D.
Kohnle, A.
Lampeitl, H.
Panter, M.
Tluczykont, M.
Aharonian, F.
Akhperjanian, A.
Beilicke, M.
Bernlohr, K.
Borst, H.
Bojahr, H.
Coarasa, T.
Contreras, J.
Contina, J.
Denninghoff, S.
Fonseca, M.
et al.
Citation: Astroparticle Physics, 2003; 20(3):267-291
Publisher: Elsevier Science BV
Issue Date: 2003
ISSN: 0927-6505
Statement of
G. Puhlhofer ... G. P. Rowell.. and W. al., the HEGRA Collaboration
Abstract: Between early 1997 and late 2002, the HEGRA collaboration operated a stereoscopic system of 4 (later 5) imaging atmospheric Cherenkov telescopes. In this paper we present the calibration schemes which were developed for the system, and report on the performance of the detector over the years. In general, the telescope system was very well understood, regarding both the absolute calibration and the slight changes in performance over the years. The system had an energy threshold of 500 GeV for observations at zenith and under optimum detector conditions. With the corresponding calibration schemes, a systematic accuracy of 15 percent on the absolute energy scale has been achieved. The continuous sensitivity monitoring provided a relative accuracy of a few percent, and showed that the threshold did not exceed 600 GeV throughout the entire operation time. The readout electronics and the imaging quality of the dishes were well monitored and stable. The absolute pointing had an accuracy of at least 25 arcsec; this number was guaranteed throughout the whole lifetime of the experiment.
Keywords: Imaging air Cherenkov technique; Very high energy gamma ray astronomy PACS: 95.55.Ka, 95.55.Vj, 96.40.Pq
Rights: (c) 2003 Elsevier B.V. All rights reserved. Submitted to Cornell University’s online archive in 2003 by Gerd Puehlhofer. Post-print sourced from
RMID: 0020071284
DOI: 10.1016/j.astropartphys.2003.06.001
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Appears in Collections:Physics publications

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