Karlsruhe 2011 – scientific programme

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T: Fachverband Teilchenphysik

T 90: Gammaastronomie IV

T 90.2: Talk

Thursday, March 31, 2011, 17:05–17:20, 30.41: 104

FACT Light Collection - Solid Light Concentrators in Cherenkov Astronomy — •Isabel Braun — ETH Zurich, Institute for Particle Physics, CH-8093 Zurich, Switzerland

Pixelized cameras of Imaging Atmospheric Cherenkov Telescopes use hollow light guides with reflective surfaces based on the Winston cone design. These cones minimize insensitive spaces between the photo sensors and shield the camera from stray background light by limiting the angular acceptance to the primary reflector area.

FACT (First G-APD Cherenkov Telescope) will be the first IACT with Geiger-mode avalanche photodiodes as light sensors. Solid light concentrators complementing these sensors will be used instead of hollow Winston cones. We will present simulations and measurements of our light collector design, which was optimized for the requirements of the FACT telescope and detector, and discuss the specific differences to more traditional solutions.