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Proceedings Paper

Monte Carlo simulation of HERD calorimeter
Author(s): M. Xu; G. M. Chen; Y. W. Dong; J. G. Lu; Z. Quan; L. Wang; Z. G. Wang; B. B. Wu; S. N. Zhang
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Paper Abstract

The High Energy cosmic-Radiation Detection (HERD) facility onboard China's Space Station is planned for operation starting around 2020 for about 10 years. It is designed as a next generation space facility focused on indirect dark matter search, precise cosmic ray spectrum and composition measurements up to the knee energy, and high energy gamma-ray monitoring and survey. The calorimeter plays an essential role in the main scientific objectives of HERD. A 3-D cubic calorimeter filled with high granularity crystals as active material is a very promising choice for the calorimeter. HERD is mainly composed of a 3-D calorimeter (CALO) surrounded by silicon trackers (TK) from all five sides except the bottom. CALO is made of 9261 cubes of LYSO crystals, corresponding to about 55 radiation lengths and 3 nuclear interaction lengths, respectively. Here the simulation results of the performance of CALO with GEANT4 and FLUKA are presented: 1) the total absorption CALO and its absorption depth for precise energy measurements (energy resolution: 1% for electrons and gammarays beyond 100 GeV, 20% for protons from 100 GeV to 1 PeV); 2) its granularity for particle identification (electron/proton separation power better than 10-5); 3) the homogenous geometry for detecting particles arriving from every unblocked direction for large effective geometrical factor (<3 m2sr for electron and diffuse gammarays, >2 m2sr for cosmic ray nuclei); 4) expected observational results such as gamma-ray line spectrum from dark matter annihilation and spectrum measurement of various cosmic ray chemical components.

Paper Details

Date Published: 24 July 2014
PDF: 8 pages
Proc. SPIE 9144, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray, 91443S (24 July 2014); doi: 10.1117/12.2055319
Show Author Affiliations
M. Xu, Institute of High Energy Physics (China)
G. M. Chen, Institute of High Energy Physics (China)
Y. W. Dong, Institute of High Energy Physics (China)
J. G. Lu, Institute of High Energy Physics (China)
Z. Quan, Institute of High Energy Physics (China)
L. Wang, Xi'an Institute of Optics and Precision Mechanics (China)
Z. G. Wang, Institute of High Energy Physics (China)
B. B. Wu, Institute of High Energy Physics (China)
S. N. Zhang, Institute of High Energy Physics (China)

Published in SPIE Proceedings Vol. 9144:
Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray
Tadayuki Takahashi; Jan-Willem A. den Herder; Mark Bautz, Editor(s)

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