Performance of a 20 m diameter Cherenkov imaging telescope

Details Performance of a 20 m diameter Cherenkov imaging telescope Performance of a 20 m diameter Cherenkov imaging telescope

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aph....21..149a&link_type=abstract

Astroparticle Physics, Volume 21, Issue 2, p. 149-161.

Physics

4

X- And Gamma-Ray Telescopes And Instrumentation

Scientific paper

In this paper, we consider the influence of the reflector design of a large multi-mirror imaging atmospheric Cherenkov telescope on the pulse shape of the light collected by the photo-receiver. As an example, we compared the response from two 20 m diameter f/1 telescopes with spherical (Davies-Cotton design) and parabolic reflectors. It is shown that the spherical reflector substantially widens the pulse of collected Cherenkov photons, while the design-induced additional widening is negligibly small for the parabolic reflector. At the detection of 10 GeV γ-showers, the pulse width on the spherical telescope's focal plane may reach 15-20 ns instead of 5-8 ns inherent to the incident light pulse itself, and is almost identical to the case with a parabolic reflector. The possibility of reducing the Cherenkov light integration gate, which is limited by the reflector's particular design, is decisive for the telescope's energy threshold lower limits.

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