Preprint

PUBDB-2022-06822

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Mirror production for the Cherenkov telescopes of the ASTRI mini-array and the MST project for the Cherenkov Telescope Array

La Palombara, N. (Corresponding author) ; Sironi, G. ; Giro, E. ; Scuderi, S. ; Canestrari, R. ; Iovenitti, S. ; Garczarczyk, M.DESY* ; Krause, M.DESY* ; Diebold, S. ; Millul, R. ; Marioni, F. ; Missaglia, N. ; Redaelli, M. ; Valsecchi, G. ; Zocchi, F. ; Zanoni, A. ; Pareschi, G.

2022

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Report No.: arXiv:2201.08103

Abstract: The Cherenkov Telescope Array (CTA) is the next ground-based γ-ray observatory in the TeV γ-ray spectral region operating with the Imaging Atmospheric Cherenkov Technique. It is based on almost 70 telescopes of different class diameters - LST, MST and SST of 23, 12, and 4 m, respectively - to be installed in two sites in the two hemispheres (at La Palma, Canary Islands, and near Paranal, Chile). Several thousands of reflecting mirror tiles larger than 1 m$^2$ will be produced for realizing the segmented primary mirrors of a so large number of telescopes. Almost in parallel, the ASTRI Mini-Array (MA) is being implemented in Tenerife (Canary Islands), composed of nine 4 m diameter dual-mirror Cherenkov telescopes (very similar to the SSTs). We completed the mirror production for all nine telescopes of the ASTRI MA and two MST telescopes (400 segments in total) using the cold glass slumping replication technology. The results related to the quality achieved with a so large-scale production are presented, also discussing the adopted testing methods and approaches. They will be very useful for the adoption and optimization of the quality assurance process for the huge production (almost 3000 m2 of reflecting surface) of the MST and SST CTA telescopes.

Keyword(s): activity report ; mirror ; Cherenkov Telescope Array ; quality: monitoring ; Cherenkov counter ; fabrication ; performance ; Mirrors ; Atmospheric Cherenkov telescopes ; Telescopes ; Reflectivity ; Glasses ; Point spread functions ; Spherical lenses ; Aluminum ; Coating ; Solids ; CTA ; ASTRI ; dual mirror ; cold-slumping technology ; hot-slumpìing technology ; coating ; quality assurance

Note: Accepted for publication in the SPIE Journal of Astronomical Telescopes, Instruments, and Systems (JATIS); 29 pages, 17 figures, 4 tables, quite a lot of stress, infinite patience. Published online on February 3, 2022 at http://dx.doi.org/10.1117/1.JATIS.8.1.014005

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Contributing Institute(s):

1. CTAI (CTAI)

Research Program(s):

1. 613 - Matter and Radiation from the Universe (POF4-613) (POF4-613)

Experiment(s):

1. Cherenkov Telescope Array

Appears in the scientific report 2022

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Database coverage:
Published

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Contribution to a conference proceedings/Journal Article Palombara, N. L. (Corresponding author) ; Sironi, G. ; Giro, E. ; Scuderi, S. ; Canestrari, R. ; Iovenitti, S. ; Garczarczyk, M.DESY* ; Krause, M.DESY* ; Diebold, S. ; Millul, R. ; Marioni, F. ; Missaglia, N. ; Redaelli, M. ; Valsecchi, G. ; Zocchi, F. ; Zanoni, A. ; Pareschi, G.
Mirror production for the Cherenkov telescopes of the ASTRI mini-array and the MST project for the Cherenkov Telescope Array
2022SPIE Optical Engineering + Applications, San DiegoSan Diego, United States, 11 Aug 2019 - 15 Aug 20192019-08-112019-08-15 Journal of astronomical telescopes, instruments, and systems 8, 014005 (2022) [10.1117/1.JATIS.8.1.014005]2022     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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