Karlsruhe 2011 – scientific programme

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T: Fachverband Teilchenphysik

T 90: Gammaastronomie IV

T 90.3: Talk

Thursday, March 31, 2011, 17:20–17:35, 30.41: 104

The structure of an Imaging Atmospheric Cherenkov Telescope with novel photon detectors for ground-based gamma-ray astronomy — •Jan-Hendrik Köhne — TU Dortmund, Dortmund, Deutschland

Very high energy gamma-ray astronomy is a rapidly expanding field of research. Observations are nearly all carried out with so-called Imaging Atmospheric Cherenkov Telescopes all using Photomultipliers as light sensors up to now. A test telescope using Geiger-mode avalanche photodiodes (G-APD) for the first time is under construction. The former HEGRA CT3 telescope mount on the Canary island La Palma is being refurbished for the First G-APD Cherenkov Telescope (FACT).

Here, we describe the mirror system, its detailed construction, focal length distribution, spectral reflectivity and point spread function for all hexagonal aluminum facets. In October 2010, the mirrors were pre-aligned on site using a laser alignment setup, and first tracking tests of the new drive system were conducted.