SST dual-mirror telescope for Cherenkov Telescope Array: An innovative mirror manufacturing process

Delphine Dumas, Jean Michel Huet, Jean Laurent Dournaux, Philippe Laporte, Cameron Rulten, Jurgen Schmoll, Hélène Sol, Frédéric Sayède, Patrice Micolon, Jean François Glicenstein, Bernard Peyaud

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

The Observatoire de Paris is constructing a prototype Small-Sized Telescope (SST) for the Cherenkov Telescope Array (CTA), named SST-GATE, based on the dual-mirror Schwarzschild-Couder optical design. Considering the mirrors size and its specific curvature and the optical requirements for the Cherenkov imaging telescope, a non-conventional process has been used for designing and manufacturing the mirrors of the SST-GATE prototype. Based on machining, polishing and coating of aluminium bulk samples, this process has been validated by simulation and tests that will be detailed in this paper after a discussion on the Schwarzschild-Couder optical design which so far has never been used to design ground based telescopes. Even if the SST-GATE is a prototype for small size telescopes of the CTA array, the primary mirror of the telescope is 4 meters diameter, and it has to be segmented. Due to the dual-mirror configuration, the alignment is a complex task that needs a well defined and precise process that will be discussed in this paper.

Original languageEnglish (US)
Title of host publicationAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation
EditorsColin R. Cunningham, Ramon Navarro, Allison A. Barto
PublisherSPIE
ISBN (Electronic)9780819496195
DOIs
StatePublished - Jan 1 2014
EventAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation - Montreal, Canada
Duration: Jun 23 2014Jun 27 2014

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume9151
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Other

OtherAdvances in Optical and Mechanical Technologies for Telescopes and Instrumentation
CountryCanada
CityMontreal
Period6/23/146/27/14

Keywords

  • CTA
  • Cherenkov astronomy
  • Dual-mirror design
  • Gamma-ray astronomy
  • Mirror manufacturing
  • Schwarzschild-Couder
  • Segmented mirrors
  • Small Size Telescope

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