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Prototyping hexagonal light concentrators using high-reflectance specular films for the Large-Sized Telescopes of the Cherenkov Telescope Array

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Published 6 December 2017 • © 2017 The Author(s)
, , Citation A. Okumura et al 2017 JINST 12 P12008 DOI 10.1088/1748-0221/12/12/P12008

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1 Institute for Space-Earth Environmental Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8601, Japan

2 College of Science, Ibaraki University, 2-1-1, Bunkyo, Mito, Ibaraki 310-8512, Japan

3 Institute for Cosmic Ray Research, The University of Tokyo, Kashiwa, Chiba 277-8582, Japan

4 Max-Planck-Institut für Kernphysik, P.O. Box 103980, D 69029 Heidelberg, Germany

5 Institut de Fisica d'Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Campus UAB, 08193 Bellaterra (Barcelona), Spain

6 Max-Planck-Institut für Physik, Föhringer Ring 6, D 80805 München, Germany

7 Department of Physics, Konan University, Kobe, Hyogo 658-8501, Japan

Dates

  1. Received 18 May 2017
  2. Accepted 6 November 2017
  3. Published

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1748-0221/12/12/P12008

Abstract

We have developed a prototype hexagonal light concentrator for the Large-Sized Telescopes of the Cherenkov Telescope Array. To maximize the photodetection efficiency of the focal-plane camera pixels for atmospheric Cherenkov photons and to lower the energy threshold, a specular film with a very high reflectance of 92–99% has been developed to cover the inner surfaces of the light concentrators. The prototype has a relative anode sensitivity (which can be roughly regarded as collection efficiency) of about 95 to 105% at the most important angles of incidence. The design, simulation, production procedure, and performance measurements of the light-concentrator prototype are reported.

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10.1088/1748-0221/12/12/P12008