Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..745..736c&link_type=abstract
HIGH ENERGY GAMMA-RAY ASTRONOMY: 2nd International Symposium on High Energy Gamma-Ray Astronomy. AIP Conference Proceedings, Vo
Astronomy and Astrophysics
Astronomy
3
Gamma-Ray Sources, Gamma-Ray Bursts, X- And Gamma-Ray Telescopes And Instrumentation
Scientific paper
The 107 m2 reflector of each H.E.S.S, telescope consists of 380 mirror facets with 60 cm diameter. Mirror facets are aligned by a fully automated system using stars imaged onto the lid of the Cherenkov camera. The alignment procedure, implying the automatic analysis of CCD images and control of the mirror actuators, has been proven to work reliably. On-axis, 80% of the reflected light is contained in a circle of less than 1 mrad (0.057° or 1.5 cm in the focal plane) diameter, well below specifications. The widening of the spot with increasing angle to the optical axis is in accordance with the expected behaviour based on simulations, and variations of spot size with elevation are uncritical. Deterioration of the point spread function overtime is of no concern; recurrent monitoring over years proved the width to be stable and thus the support structure to be very stiff.
Cornils R.
E. S. S Collaboration H.
Gillessen Stefan
Hofmann Werner
Jung Inhwa
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