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19 April 2024 |
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FACT - How stable are the silicon photon detectors? | | T. Bretz
; A. Biland
; J. Buß
; D. Dorner
; S. Einecke
; D. Eisenacher
; D. Hildebrand
; M. L. Knoetig
; T. Krähenbühl
; W. Lustermann
; K. Mannheim
; K. Meier
; D. Neise
; A.-K. Overkemping
; A. Paravac
; F. Pauss
; W. Rhode
; M. Ribordy
; T. Steinbring
; F. Temme
; J. Thaele
; P. Vogler
; R. Walter
; Q. Weitzel
; M. Zänglein
; | | Date: |
7 Aug 2013 | | Abstract: | The First G-APD Cherenkov telescope (FACT) is the first telescope using
silicon photon detectors (G-APD aka. SiPM). The use of Silicon devices promise
a higher photon detection efficiency, more robustness and higher precision than
photo-multiplier tubes. Since the properties of G-APDs depend on auxiliary
parameters like temperature, a feedback system adapting the applied voltage
accordingly is mandatory.
In this presentation, the feedback system, developed and in operation for
FACT, is presented. Using the extraction of a single photon-equivalent (pe)
spectrum as a reference, it can be proven that the sensors can be operated with
very high precision. The extraction of the single-pe, its spectrum up to
10,pe, its properties and their precision, as well as their long-term behavior
during operation are discussed. As a by product a single pulse template is
obtained. It is shown that with the presented method, an additional external
calibration device can be omitted. The presented method is essential for the
application of G-APDs in future projects in Cherenkov astronomy and is supposed
to result in a more stable and precise operation than possible with
photo-multiplier tubes. | | Source: | arXiv, 1308.1515 | | Services: | Forum | Review | PDF | Favorites | |
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