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Monte Carlo studies of medium-size telescope designs for the Cherenkov Telescope Array
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Number of Authors: 4
2016 (English)In: Astroparticle physics, ISSN 0927-6505, E-ISSN 1873-2852, Vol. 72, 11-31 p.Article in journal (Refereed) Published
Abstract [en]

We present studies for optimizing the next generation of ground-based imaging atmospheric Cherenkov telescopes (IACTs). Results focus on mid-sized telescopes (MSTs) for CTA, detecting very high energy gamma rays in the energy range from a few hundred GeV to a few tens of TeV. We describe a novel, flexible detector Monte Carlo package, FAST (FAst Simulation for imaging air cherenkov Telescopes), that we use to simulate different array and telescope designs. The simulation is somewhat simplified to allow for efficient exploration over a large telescope design parameter space. We investigate a wide range of telescope performance parameters including optical resolution, camera pixel size, and light collection area. In order to ensure a comparison of the arrays at their maximum sensitivity, we analyze the simulations with the most sensitive techniques used in the field, such as maximum likelihood template reconstruction and boosted decision trees for background rejection. Choosing telescope design parameters representative of the proposed Davies-Cotton (DC) and Schwarzchild-Couder (SC) MST designs, we compare the performance of the arrays by examining the gamma-ray angular resolution and differential point-source sensitivity. We-further investigate the array performance under a wide range of conditions, determining the impact of the number of telescopes, telescope separation, night sky background, and geomagnetic field. We find a 30-40% improvement in the gamma-ray angular resolution at all energies when comparing arrays with an equal number of SC and DC telescopes, significantly enhancing point-source sensitivity in the MST energy range. We attribute the increase in point-source sensitivity to the improved optical point-spread function and smaller pixel size of the SC telescope design.

Place, publisher, year, edition, pages
2016. Vol. 72, 11-31 p.
Keyword [en]
Monte Carlo simulations, Cherenkov telescopes, IACT technique, Gamma rays, Cosmic rays
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:su:diva-122231DOI: 10.1016/j.astropartphys.2015.04.008ISI: 000362143000002OAI: diva2:866637
Available from: 2015-11-03 Created: 2015-10-28 Last updated: 2015-11-03Bibliographically approved

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Dumm, Jonathan
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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