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  Absolute reflectance of a concave mirror used for astro-particle physics experiments

Mirzoyan, R., Arcaro, C., Kellermann, H., & Garczarczyk, M. (2019). Absolute reflectance of a concave mirror used for astro-particle physics experiments. Astroparticle Physics, 105, 1-12. doi:10.1016/j.astropartphys.2018.09.001.

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Mirzoyan, Razmik1, Author
Arcaro, Cornelia1, Author
Kellermann, Hanna1, Author
Garczarczyk, Markus1, Author
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1Max Planck Institute for Physics, Max Planck Society and Cooperation Partners, ou_2253650              

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Free keywords: MAGIC
 Abstract: The absolute reflectance of a reflector and its point spread function are the key parameters of a telescope for measuring light flux. Typically, one is using low-cost technologies for producing mirrors for the needs of astro-particle physics experiments. As a rule, these are operating telescopes in open air conditions at desert or mountainous locations, for cost reasons without protecting domes. The mirrors on such telescopes are exposed to sand in strong winds, precipitation and large temperature variations. Due to weathering, their reflectance is declining within few years. In this report we describe in a great detail the application of an in-situ method to the MAGIC imaging air Cherenkov telescopes for regularly monitoring their absolute reflectance and the point spread function. Compared to similar work that was previously performed, in this report we focus on important details of light losses due to scattering. These allowed us to further refine the method and significantly improve its precision. Also, we report on an in-situ comparison of two mirror types produced with different technologies.

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 Dates: 2019
 Publication Status: Issued
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Title: Astroparticle Physics
  Abbreviation : Astropart.Phys.
Source Genre: Journal
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Pages: - Volume / Issue: 105 Sequence Number: - Start / End Page: 1 - 12 Identifier: -