The Cherenkov optics qualification facilities at INAF-OAB laboratories

Sironi, G.; Canestrari, R.; Giro, E.; Palombara, N. La; Pareschi, G.

doi:10.1016/j.nima.2019.05.004

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…For 15 of these MST segments, the additional measurements were performed at INAF-OAB, using an outdoor optical bench based on a 2f configuration, installed at the laboratories of the Brera Astronomical Observatory in Merate (Italy). 55 Other 5 MST segments (different from those measured at OAB) were instead verified at the DESY 2f optical bench. 56 In both cases, the 2f facility uses a LED as light source (without any diffuser, since the generated wavefront is already spherical) and a CCD camera as image detector: in this way a photometric image is obtained, which is characterized by high homogeneity and uniformity.…”

Section: Quality Assurance Approachmentioning

confidence: 98%

Mirror production for the Cherenkov telescopes of the ASTRI mini-array and the MST project for the Cherenkov Telescope Array

Palombara

Sironi

Giro

et al. 2022

J. Astron. Telesc. Instrum. Syst.

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The Cherenkov Telescope Array (CTA) is the next ground-based gamma-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-Large-Sized Telescope, Medium-Sized Telescope (MST), and Small-Sized Telescope (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 MSTs (400 segments in total) using the cold glass slumping replication technology. The results related to the quality achieved with a 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 m 2 of reflecting surface) of the MST and SST CTA telescopes. © The Authors.Published by SPIE under a Creative Commons Attribution 4.0 International License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Quality Assurance Approachmentioning

confidence: 98%

Mirror production for the Cherenkov telescopes of the ASTRI mini-array and the MST project for the Cherenkov Telescope Array

Palombara

Sironi

Giro

et al. 2022

J. Astron. Telesc. Instrum. Syst.

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“…Many state-of-the-art ground-based observatories use freeform optics to some degree. [10][11][12] For instance, the GNIRS instrument at Gemini Telescope incorporated a monolithic image-slicer constructed from a groovedfreeform surface 12 for its Integrated-Field-Unit (IFU) unit to reduce the complication of the alignment process and increase the overall throughput. Furthermore, compact and light freeform surfaces are essential for the recent and next-generation space missions.…”

Section: The Astronomical Applications Of Freeform Opticsmentioning

confidence: 99%

Lightweight, aluminum, mirror design optimization for conventional and additive manufacturing processes

Paenoi

Bourgenot²,

Atkins³

et al. 2022

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V

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Lightweight, aluminum, freeform prototype mirrors have been designed and fabricated by a Thai led team, with UK support, for intended applications within the Thai Space Consortium (TSC) satellite series. The project motivation was to explore the different design strategies and fabrication steps enabled by both conventional (mill, drill, and lathe) and additive (3D printing) manufacture of the prototype substrates. Single Point Diamond Turning was used to convert the substrates into mirrors and optical metrology was used to evaluate the different mirror surfaces.The prototype criteria originated from the TSC-1 satellite tertiary mirror, which is designed to minimize the effect of Seidel aberrations before the beam enters the hyperspectral imager. To converge upon the prototype designs, Finite Element Analysis (FEA) was used to evaluate the different physical conditions experienced by the prototypes during manufacture and how these influence the optical performance. The selected designs satisfied the mass and surface displacement criteria of the prototype and were adapted to either the conventional or additive manufacturing process. This paper will present the prototype design process, substrate manufacture, optical fabrication, and an interferometric evaluation of the optical surfaces comparing the conventional and additive manufacturing processes.

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The Cherenkov optics qualification facilities at INAF-OAB laboratories

Cited by 2 publications

References 5 publications

Mirror production for the Cherenkov telescopes of the ASTRI mini-array and the MST project for the Cherenkov Telescope Array

Mirror production for the Cherenkov telescopes of the ASTRI mini-array and the MST project for the Cherenkov Telescope Array

Lightweight, aluminum, mirror design optimization for conventional and additive manufacturing processes

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