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Verification of the Optical System of the 9.7-m Prototype Schwarzschild-Couder Telescope

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arxiv 2010.13027 v1 pith:UFFQ2F7M submitted 2020-10-25 astro-ph.IM hep-ex

C. Adams , R. Alfaro , G. Ambrosi , M. Ambrosio , C. Aramo , W. Benbow , B. Bertucci , E. Bissaldi
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M. Bitossi A. Boiano C. Bonavolontà R. Bose A. Brill J. H. Buckley K. Byrum R. A. Cameron M. Capasso M. Caprai C. E. Covault L. Di Venere S. Fegan Q. Feng E. Fiandrini A. Furniss M. Garczarczyk F. Garfias A. Gent N. Giglietto F. Giordano M. M. González R. Halliday O. Hervet G. Hughes T. B. Humensky M. Ionica A. Iriarte W. Jin P. Kaarat D. Kieda B. Kim F. Licciulli M. Limon S. Loporchio V. Masone T. Meures B. A. W. Mode R. Mukherjee D. Nieto A. Okumura N. Otte N. La Palombara F. R. Pantaleo R. Paoletti G. Pareschi A. Petrashyk J. Powell K. Powell D. Ribeiro E. Roache J. Rousselle A. Rugliancich J. Ruíz-Díaz-Soto M. Santander S. Schlenstedt S. Scuderi R. Shang G. Sironi B. Stevenson L. Stiaccini L. P. Taylor L. Tosti G. Tovmassian V. Vagelli M. Valentino J. Vandenbroucke V. V. Vassiliev S. P. Wakely P. Wilcox D. A. Williams P. Yu
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classification astro-ph.IMhep-ex
keywords telescopegammaobservatorypsctschwarzschild-couderasphericatmosphericcherenkov
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abstract

For the first time in the history of ground-based $\gamma$-ray astronomy, the on-axis performance of the dual mirror, aspheric, aplanatic Schwarzschild-Couder optical system has been demonstrated in a $9.7$-m aperture imaging atmospheric Cherenkov telescope. The novel design of the prototype Schwarzschild-Couder Telescope (pSCT) is motivated by the need of the next-generation Cherenkov Telescope Array (CTA) observatory to have the ability to perform wide ($\geq 8^{\circ}$) field-of-view observations simultaneously with superior imaging of atmospheric cascades (resolution of $0.067^{\circ}$ per pixel or better). The pSCT design, if implemented in the CTA installation, has the potential to improve significantly both the $\gamma$-ray angular resolution and the off-axis sensitivity of the observatory, reaching nearly the theoretical limit of the technique and thereby making a major impact on the CTA observatory sky survey programs, follow-up observations of multi-messenger transients with poorly known initial localization, as well as on the spatially resolved spectroscopic studies of extended $\gamma$-ray sources. This contribution reports on the initial alignment procedures and point-spread-function results for the challenging segmented aspheric primary and secondary mirrors of the pSCT.

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  1. Using Muon Rings for the Calibration of the Cherenkov Telescope Array: An Analytical Solution for the Dual-Mirror Telescope Using Vector Geometry

    astro-ph.IM 2026-07 conditional novelty 8.0 of 10

    A first analytical solution for dual-mirror Cherenkov-telescope muon-ring calibration is derived, including secondary-mirror shadowing and mirror-curvature corrections.

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