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The optical reflector system for the CANGAROO-II imaging atmospheric Cherenkov telescope |
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| Authors: | A Kawachi Y Hayami J Jimbo S Kamei T Kifune H Kubo J Kushida S LeBohec K Miyawaki M Mori K Nishijima J R Patterson R Suzuki T Tanimori S Yanagita T Yoshikoshi A Yuki |
| Institution: | a Institute for Cosmic Ray Research, University of Tokyo, Tanashi, Tokyo 188-8502, Japan b Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan c Department of Physics, Tokai University, Hiratsuka, Kanagawa 259-1292, Japan d Communication Systems Center, Mitsubishi Electric Corporation, Amagasaki, Hyogo 661-8661, Japan e Department of Physics and Mathematical Physics, University of Adelaide, South Australia 5005, Australia f Faculty of Science, Ibaraki University, Mito, Ibaraki 310-8521, Japan g STE Laboratory, Nagoya University, Nagoya, Aichi 464-8601, Japan |
| Abstract: | A new imaging atmospheric Cherenkov telescope with a light-weight reflector has been constructed. Light, robust, and durable mirror facets of containing carbon fiber reinforced plastic laminates were developed for the telescope. The reflector has a parabolic shape (f/1.1) with a 30 m2 surface area, which consists of 60 spherical mirror facets. The image size of each mirror facet is 0°.08 (FWHM) on average. The attitude of each facet can be adjusted by stepping motors. After the first in situ adjustment, a point image of about 0°.14 (FWHM) over 3° field of view was obtained. The effect of gravitational load on the optical system was confirmed to be negligible at the focal plane. The telescope has been in operation with an energy threshold for γ-rays of  300 GeV since May 1999. |
| Keywords: | γ-ray telescopes Ground-based instruments Imaging atmospheric Cherenkov technique New instrument Reflector |
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