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

Okumura, A.; Dang, T. V.; Ono, S.; Tanaka, S.; Hayashida, M.; Hinton, J.; Katagiri, H.; Noda, K.; Teshima, M.; Yamamoto, T.; Yoshida, T.

doi:10.1088/1748-0221/12/12/P12008

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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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Hinton, J.
Division Prof. Dr. James A. Hinton, MPI for Nuclear Physics, Max Planck Society;

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Citation

Okumura, A., Dang, T. V., Ono, S., Tanaka, S., Hayashida, M., Hinton, J., et al. (2017). Prototyping hexagonal light concentrators using high-reflectance specular films for the Large-Sized Telescopes of the Cherenkov Telescope Array. Journal of Instrumentation, 12: P12008. doi:10.1088/1748-0221/12/12/P12008.

Cite as: https://hdl.handle.net/21.11116/0000-0000-BACB-A

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.