Mirror Development for the Cherenkov Telescope Array

A. F\"orster (1); T. Armstrong (2); H. Baba (3); J. B\"ahr (4); A.; Bonardi (5); G. Bonnoli (6); P. Brun (7); R. Canestrari (6); P. Chadwick (2),; M. Chikawa (8); P.-H. Carton (7); V. De Souza (9); J. Dipold (9); M. Doro; (10); D. Durand (7); M. Dyrda (11); E. Giro (12); J.-F. Glicenstein (7); Y.; Hanabata (13); M. Hayashida (8); M. Hrabovski (14); C. Jeanney (7); M. Kagaya; (3); H. Katagiri (3); L. Lessio (12); D. MANDAT (14); M. Mariotti (10); C.; Medina (15); J. Micha{\l}owski (11); P. Micolon (7); D. Nakajima (16); J.; Niemiec (11); A. Nozato (13); M. Palatka (14); G. Pareschi (6); M. Pech (14),; B. Peyaud (7); G. P\"uhlhofer (5); M. Rataj (17); G. Rodeghiero (12); G.; Rojas (18); J. Rousselle (19); R. Sakonaka (13); P. Schovanek (14); K.; Seweryn (17); C. Schultz (10); S. Shu (13); F. Stinzing (20); M. Stodulski; (11); M. Teshima (8,16); P. Travniczek (14); C. Van Eldik (20); V. Vassiliev; (19); {\L}. Wi\'sniewski (17); A. W\"ornlein (20); T. Yoshida (3) (for the; CTA Consortium) ((1) Max-Planck-Institut f\"ur Kernphysik; Heidelberg,; Germany; (2) University of Durham; Durham; Great Britain; (3) Ibaraki; University; Japan; (4) Desy Zeuthen; Zeuthen; Germany; (5) IAAT,; Universit\"at T\"ubingen; T\"ubingen; Germany; (6) INAF - Osservatorio; Astronomico di Brera; Merate; Italy; (7) CEA; Irfu; Centre de Saclay,; Gif-sur-Yvette; France; (8) ICRR University of Tokyo; Japan; (9) Instituto de; Fsica de So Carlos; Universidade de S\~ao Paulo; Brasil; (10) University of; Padova; INFN sezione di Padova; Padova; Italy; (11) Institute of Nuclear; Physics; Polish Academy of Sciences; Krak\'ow; Poland; (12) INAF -; Osservatorio Astronomico di Padova; Padova; Italy; (13) Kinki University,; Japan; (14) Institute of Physics of the Academy of Sciences of the Czech; Republic; Prague; Czech Republic; (15) Instituto Argentino de; Radioastronomia; CCT La Plata-CONICET; Argentina; (16) Max-Planck-Institut; f\"ur Physik; M\"unchen; Germany; (17) Space Research Center - Polish Academy; of Science; Warsaw; Poland; (18) Universidade Federal de So Carlos; (19); University of California Los Angeles; California; USA; (20) ECAP,; Universit\"at Erlangen-N\"urnberg; Erlangen; Germany)

arXiv:1307.4563·astro-ph.IM·August 16, 2019

Mirror Development for the Cherenkov Telescope Array

A. F\"orster (1), T. Armstrong (2), H. Baba (3), J. B\"ahr (4), A., Bonardi (5), G. Bonnoli (6), P. Brun (7), R. Canestrari (6), P. Chadwick (2),, M. Chikawa (8), P.-H. Carton (7), V. De Souza (9), J. Dipold (9), M. Doro, (10), D. Durand (7), M. Dyrda (11), E. Giro (12)

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TL;DR

This paper discusses the development of new, cost-effective mirror technologies and coatings for the Cherenkov Telescope Array, aiming to enhance performance and reduce production costs for large-scale gamma-ray observatories.

Contribution

It introduces novel mirror substrate technologies and advanced surface coatings specifically designed for the CTA, improving efficiency and durability over existing methods.

Findings

01

Development of lightweight, reliable mirror substrates.

02

Implementation of high-reflectance coatings with longer lifetimes.

03

Pre-production of new mirror technologies has begun.

Abstract

The Cherenkov Telescope Array (CTA) is a planned observatory for very-high energy gamma-ray astronomy. It will consist of several tens of telescopes of different sizes, with a total mirror area of up to 10,000 square meters. Most mirrors of current installations are either polished glass mirrors or diamond-turned aluminium mirrors, both labour intensive technologies. For CTA, several new technologies for a fast and cost-efficient production of light-weight and reliable mirror substrates have been developed and industrial pre-production has started for most of them. In addition, new or improved aluminium-based and dielectric surface coatings have been developed to increase the reflectance over the lifetime of the mirrors compared to those of current Cherenkov telescope instruments.

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