Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..745..779s&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
Gamma-Ray Sources, Gamma-Ray Bursts, X- And Gamma-Ray Telescopes And Instrumentation
Scientific paper
The time spread of the rays collected by a large diameter imaging atmospheric Cherenkov telescope (d~20-30 m) is investigated. We compare the influence of the geometry of the spherical and parabolic reflectors on the shape and duration of collected Cherenkov light. It is shown that the design-induced additional widening of the collected Cherenkov light pulse is essential for the spherical reflector of Davies-Cotton type, and 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. In the case with a parabolic telescope the pulse widths of the light incident on the telescope disk and collected onto the camera are almost identical.
Akhperjanian Ashot
Sahakian Vardan
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