Wuppertal 2015 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 52: Gammaastronomie III
T 52.1: Vortrag
Dienstag, 10. März 2015, 16:45–17:00, I.13.71 (HS 28)
FACT - reflector alignment results based on Solar Concentrator Characterization At Night (SCCAN) and Bokeh alignment — •Sebastian Müller1,2, Max Nöthe1, and Jens Buss1 for the FACT collaboration — 1Universität Dortmund — 2ETH Zürich
Imaging Air Cherenkov Telescopes, including the First G-APD Cherenkov Telescope (FACT), use multiple mirror reflectors. These reflectors offer a great performance for very little resources. However one challange of multiple mirror reflectors is the alignment of the single mirrors to gain a good image. To align the FACT reflector a method developed by the VERITAS group was adopted and enhanced. Using a 1/10th scale model of FACT, the alignment system was developed off site in the lab which results in a highly telescope independent procedure. Finally FACT's reflector was aligned using all new Bokeh alignment and fine adjusted using enhanced SCCAN in May 2014. The basic alignment system and the alignment procedure on the telescope will be presented. Alignment results are presented by comparison of star images using visible light and actual muon detection rates to compare the overall telescope performance before and after the reflector alignment.
Keywords: Reflector, mirror alignment, point spread function, reflector time spread, ray tracing, OpenCV, computer vision, solar concentrator characterization at night, VERITAS McGill alignment, CCD industrial camera