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          Institute: MPI für Kernphysik     Collection: High-Energy Astrophysics     Display Documents

ID: 51253.0, MPI für Kernphysik / High-Energy Astrophysics
The optical system of the H.E.S.S. imaging atmospheric Cherenkov telescopes. Part II: mirror alignment and point spread function
Authors:Cornils, R.; Gillessen, S.; Jung, I.; Hofmann, W.; Beilicke, M.; Bernlöhr, K.; Carrol, O.; Elfahem, S.; Heinzelmann, G.; Hermann, G.; Horns, D.; Kankanyan, R.; Katona, A.; Krawczynski, H.; Panter, M.; Rayner, S.; Rowell, G.; Tluczykont, M.; van Staa, R.
Date of Publication (YYYY-MM-DD):2003-11
Title of Journal:Astroparticle Phyics
Journal Abbrev.:Astrop. Phys.
Issue / Number:2
Start Page:129
End Page:143
Copyright:Elsevier B.V
Review Status:not specified
Audience:Experts Only
Abstract / Description:Mirror facets of the high energy stereoscopic system imaging atmospheric Cherenkov telescopes are aligned using stars imaged onto the closed lid of the photomultiplier camera, viewed by a CCD camera. The alignment procedure works reliably and includes the automatic analysis of CCD images and control of the facet alignment actuators. On-axis, 80% of the reflected light is contained in a circle of less than 1 mrad diameter. The spot widens with increasing angle to the telescope axis. In accordance with simulations, the spot size has roughly doubled at an angle of 1.4° from the axis. The expected variation of spot size with elevation due to deformations of the support structure is visible, but is completely non-critical over the usual working range. Overall, the optical quality of the telescope exceeds the specifications.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group of H. J. Völk/High Energy Astrophysics (F. Aharonian)
MPI für Kernphysik/Group of W. Hofmann/Experimental High-Energy Astrophysics (M. Panter, G. Hermann)
External Affiliations:Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, D-22761, Hamburg, Germany
Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland
The Observatory, Durham University, Potters Bank, Durham, UK
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