Consideration of Cassegrain Imaging Atmospheric Cherenkov Telescopes

Details Consideration of Cassegrain Imaging Atmospheric Cherenkov Telescopes Consideration of Cassegrain Imaging Atmospheric Cherenkov Telescopes

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007ebhe.conf..349y&link_type=abstract

ENERGY BUDGET IN THE HIGH ENERGY UNIVERSE . Proceedings of the International Workshop. Held 22-24 February 2006 in Kashiwa, Japa

Physics

Optics

Scientific paper

We studied Cassegrain-type telescope design for IACTs to reduce the weight and cost of the telescope, keeping currently achieved optical performance of Imaging Air Cherenkov Telescopes (IACTs) in spot size, field of view, light collection performance. In addition to currently used prime-focus type telescope design, Classical Cassegrain and Ritchey-Chrétien Cassegrain optical system have been evaluated by using of an aberration theory and a ray-tracing method. We found that, in some ideal cases, the Ritchey-Chrétien optics can reduce the length of telescope down to 20% of the prime-focus optics of the same spot size at 1 degree incident angle, whereas the loss of light by the secondary mirror shadow and the second reflection is about 20% assuming a reflectivity of 85%.

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