PoS - Proceedings of Science
Volume 395 - 37th International Cosmic Ray Conference (ICRC2021) - GAD - Gamma Ray Direct
The Advanced Particle-astrophysics Telescope: Simulation of the Instrument Performance for Gamma-Ray Detection
S. Alnussirat, C. Altomare, R.G. Bose, D.L. Braun, J.H. Buckley, J. Buhler, E. Burns, R.D. Chamberlain, W. Chen*, M.L. Cherry, L. Di Venere, J. Dumonthier, M. Errando, S. Funk, F. Giordano, J. Hoffman, Z. Hughes, D.J. Huth, P.L. Kelly, J.F. Krizmanic, M. Kuwahara, F. Licciulli, G. Liu, M.N. Mazziotta, J.G. Mitchell, J.W. Mitchell, G.A. de Nolfo, R. Paoletti, R. Pillera, B.F. Rauch, D. Serini, G.E. Simburger, M. Sudvarg, G. Suarez, T. Tatoli, G.S. Varner, E.A. Wulf, A. Zink and W.V. Zoberet al. (click to show)
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Pre-published on: July 30, 2021
Published on: March 18, 2022
We present simulations of the instrument performance of the Advanced Particle-astrophysics Telescope (APT), a mission concept of a $\gamma$-ray and cosmic-ray observatory in a sun-Earth Lagrange orbit. The key components of the APT detector include a multiple-layer tracker composed of scintillating fibers and an imaging calorimeter composed of thin layers of CsI:Na scintillators. The design is aimed at maximizing effective area and field of view for $\gamma$-ray and cosmic-ray measurements, subject to constraints on instrument cost and total payload mass. We simulate a detector design based on $3$-meter scintillating fibers and develop reconstruction algorithms for $\gamma$-rays from a few hundreds of $\mathrm{keV}$ up to a few $\mathrm{TeV}$ energies. At the photon energy above $30~\mathrm{MeV}$, pair-production/shower reconstruction is applied; the results show that APT could provide an order of magnitude improvement in effective area and sensitivity for $\gamma$-ray detection compared with the Fermi Large Area Telescope (LAT). A multiple-Compton-scattering reconstruction at photon energies below $10~\mathrm{MeV}$ achieves sensitive detection of faint $\gamma$-ray bursts (GRBs) and other $\gamma$-ray transients down to $\sim0.01~\mathrm{MeV/cm}^2$ with degree-level to sub-degree-level localization accuracy. The Compton analysis also provides a measurement of polarization where the minimum detectable degree of polarization for $\sim1~\mathrm{MeV/cm}^2$ GRBs is below $20\%$. In addition to the APT simulations, we present the simulated performance of the Antarctic Demonstrator for APT, a 0.5m-square cross section balloon experiment that includes all of the key elements of the full APT detector.
DOI: https://doi.org/10.22323/1.395.0590
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