Monte Carlo studies of medium-size telescope designs for the Cherenkov Telescope Array

Wood, M. D.; Jogler, T.; Dumm, J.; Funk, S.

doi:10.1016/j.astropartphys.2015.04.008

Title: Monte Carlo studies of medium-size telescope designs for the Cherenkov Telescope Array

Journal Article · Sun Jun 07 00:00:00 EDT 2015 · Astroparticle Physics

DOI:https://doi.org/10.1016/j.astropartphys.2015.04.008· OSTI ID:1165916

Wood, M. D. ^[1]; Jogler, T. ^[1]; Dumm, J. ^[2]; Funk, S. ^[3]

SLAC National Accelerator Lab., Menlo Park, CA (United States)
Stockholm Univ. (Sweden). Oskar Klein Centre and Dept. of Physics
SLAC National Accelerator Lab., Menlo Park, CA (United States); Friedrich-Alexander Univ. Erlangen-Nurnberg (Germany). Erlangen Center for Astroparticle Physics (ECAP)

In this paper, 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. Finally, we attribute the increase in point-source sensitivity to the improved optical point-spread function and smaller pixel size of the SC telescope design.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1165916

Alternate ID(s):: OSTI ID: 1396599

Report Number(s):: SLAC-PUB-16141

Journal Information:: Astroparticle Physics, Vol. 72; ISSN 0927-6505

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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