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27 April 2024

» arxiv » 2110.07463

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Prototype Schwarzschild-Couder Telescope for the Cherenkov Telescope Array: Commissioning the Optical System
C. B. Adams ; G. Ambrosi ; M. Ambrosio ; C. Aramo ; P. I. Batista ; W. Benbow ; B. Bertucci ; E. Bissaldi ; M. Bitossi ; A. Boiano ; C. Bonavolontà ; R. Bose ; A. Brill ; J. H. Buckley ; R. A. Cameron ; R. Canestrari ; M. Capasso ; M. Caprai ; C. E. Covault ; D. Depaoli ; L. Di Venere ; M. Errando ; S. Fegan ; Q. Feng ; E. Fiandrini ; A. Furniss ; A. Gent ; N. Giglietto ; F. Giordano ; E. Giro ; R. Halliday ; O. Hervet ; T. B. Humensky ; S. Incardona ; M. Ionica ; W. Jin ; D. Kieda ; F. Licciulli ; S. Loporchio ; G. Marsella ; V. Masone ; K. Meagher ; T. Meures ; B. A. W. Mode ; S. A. I. Mognet ; R. Mukherjee ; D. Nieto ; A. Okumura ; N. Otte ; F. R. Pantaleo ; R. Paoletti ; G. Pareschi ; F. Di Pierro ; E. Pueschel ; D. Ribeiro ; L. Riitano ; E. Roache ; J. Rousselle ; A. Rugliancich ; M. Santander ; R. Shang ; L. Stiaccini ; L. P. Taylor ; L. Tosti ; G. Tovmassian ; G. Tripodo ; V. Vagelli ; M. Valentino ; J. Vandenbroucke ; V. V. Vassiliev ; D. A. Williams ; P. Yu ;
Date:	14 Oct 2021
Abstract:	A prototype Schwarzschild-Couder Telescope (pSCT) has been constructed at the Fred Lawrence Whipple Observatory as a candidate for the medium-sized telescopes of the Cherenkov Telescope Array Observatory (CTAO). CTAO is currently entering early construction phase of the project and once completed it will vastly improve very high energy gamma-ray detection component in multi-wavelength and multi-messenger observations due to significantly improved sensitivity, angular resolution and field of view comparing to the current generation of the ground-based gamma-ray observatories H.E.S.S., MAGIC and VERITAS. The pSCT uses a dual aspheric mirror design with a $9.7$ m primary mirror and $5.4$ m secondary mirror, both of which are segmented. The Schwarzschild-Couder (SC) optical system (OS) selected for the prototype telescope achieves wide field of view of $8$ degrees and simultaneously reduces the focal plane plate scale allowing an unprecedented compact ($0.78$m diameter) implementation of the high-resolution camera ($6$mm/ $0.067$deg per imaging pixel with $11,328$ pixels) based on the silicon photo-multipliers (SiPMs). The OS of the telescope is designed to eliminate spherical and comatic aberrations and minimize astigmatism to radically improve off-axis imaging and consequently angular resolution across all the field of view with respect to the conventional single-mirror telescopes. Fast and high imaging resolution OS of the pSCT comes with the challenging submillimeter-precision custom alignment system, which was successfully demonstrated with an on-axis point spread function (PSF) of $2.9$ arcmin prior to the first-light detection of the Crab Nebula in 2020. Ongoing and future commissioning activities are reported.
Source:	arXiv, 2110.07463
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