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Communication Dans Un Congrès Année : 2021

Assessment of the GCT Prototypes Optical System Implementation and Other Key Performances for the Cherenkov Telescope Array

Résumé

The Cherenkov Telescope Array (CTA) project, led by an international collaborationof institutes, aims to create the world's largest next generation observatory for Very HighEnergy (VHE) gamma-ray astronomy. It will be devoted to observations in a wide band ofenergy, from a few tens of GeV to a few hundreds of TeV with Large, Medium and Small-sizedtelescopes.The Small-Size Telescopes (SSTs) are dedicated to the highest energy range above afew TeV and up to 300 TeV. GCT is an imaging atmospheric Cherenkov telescope (IACT)proposed for the subarray of about 70 SSTs to be installed on the Southern site of CTA inChile. The Observatory of Paris and the National Institute for Earth Sciences and Astronomy(INSU/CNRS) have developed the mechanical structure, mirrors (aspherical lightweightaluminium segments) and control system of the GCT. The GCT is based on a Schwarzschild-Couder (S-C) dual-mirror optical design which has the advantages, compared to the currentIACTs, to offer a wide field of view (~ 9°) while decreasing the cost and volume (~ 9 m x 4 mx 6 m for ~ 11 tons) of the telescope structure, as well as the camera. The prototype (pGCT)has been installed at the Meudon's site of the Observatory of Paris and was the first S-Ctelescope and the first CTA prototype to record VHE events on-sky in November 2015.After three years of intensive testing, pGCT has now been commissioned. This paperis a status report on the complete GCT telescope optical system and the performance it canprovide for CTA.

Dates et versions

hal-02340140 , version 1 (30-10-2019)

Identifiants

Citer

A. Dmytriiev, L. Dangeon, G. Fasola, H. Sol, A. Zech, et al.. Assessment of the GCT Prototypes Optical System Implementation and Other Key Performances for the Cherenkov Telescope Array. 36th International Cosmic Ray Conference, Jul 2019, Madison, United States. pp.663, ⟨10.22323/1.358.0663⟩. ⟨hal-02340140⟩
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