The reflecting surface of the MAGIC-II Telescope
D. Bastieri (1, 2), J. Arnold (3), C. Baixeras (4), O. Citterio, (5), F. Dazzi (1, 2), B. De Lotto (6), M. Doro (1, 2), M. Ghigo (7 and, 5), E. Giro (8, 2), F. Goebel (9), R. Kosyra (9), E. Lorenz (10), M., Mariotti (1, 2), R. Mirzoyan (9), R. Paoletti (11), G. Pareschi (7, 5),

TL;DR
This paper describes the design, construction, and testing of the new reflecting mirrors for the MAGIC-II telescope, focusing on the diamond milling technique used for mirror fabrication.
Contribution
It introduces a new mirror fabrication method using diamond milling for the MAGIC-II telescope, detailing its application and performance.
Findings
Diamond milling produces reliable, lightweight mirrors.
Mirrors meet performance specifications.
Technique is cost-effective and scalable.
Abstract
The MAGIC Collaboration is building a second telescope, MAGIC II, improving the design of the current MAGIC Telescope. MAGIC II is being built at 85 m of distance from MAGIC I, and will also feature a huge reflecting surface of ~240 m of area. One of the improvement is the design for the mirror of MAGIC II, that are lighter and larger, being square of 1 m of side and weighting around 15 kg. For the development and production of the new mirrors, two different techniques, both reliable and affordable in price, were selected: the diamond milling of aluminium surfaces and the cold slumping of thin glass panes. As tests for the second one are still ongoing, we present a description of the diamond milling technique, and its application and performance to the produced mirrors.
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Taxonomy
TopicsAdaptive optics and wavefront sensing · Calibration and Measurement Techniques
