The High Energy cosmic-Radiation Detection (HERD) facility is one of several space astronomy payloads of the cosmic light house program onboard China's Space Station, which is planned for operation starting around 2020 for about 10 years. Beam test with a HERD prototype, to verify the HERD specifications and the reading out method of wavelength shifting fiber and image intensified CCD, was taken at CERN SPS in November, 2015. The prototype is composed of an array of 5*5*10 LYSO crystals, which is 1/40th of the scale of HERD calorimeter. Experimental results on the performances of the calorimeter are discussed.
S. N. Zhang, O. Adriani, S. Albergo, G. Ambrosi, Q. An, T. W. Bao, R. Battiston, X. J. Bi, Z. Cao, J. Y. Chai, J. Chang, G. M. Chen, Y. Chen, X. H. Cui, Z. G. Dai, R. D'Alessandro, Y. W. Dong, Y. Z. Fan, C. Q. Feng, H. Feng, Z. Y. Feng, X. H. Gao, F. Gargano, N. Giglietto, Q. B. Gou, Y. Q. Guo, B. L. Hu, H. B. Hu, H. H. He, G. S. Huang, J. Huang, Y. F. Huang, H. Li, L. Li, Y. G. Li, Z. Li, E. W. Liang, H. Liu, J. B. Liu, J. T. Liu, S. B. Liu, S. M. Liu, X. Liu, J. G. Lu, M. Mazziotta, N. Mori, S. Orsi, M. Pearce, M. Pohl, Z. Quan, F. Ryde, H. L. Shi, P. Spillantini, M. Su, J. C. Sun, X. L. Sun, Z. C. Tang, R. Walter, J. C. Wang, J. M. Wang, L. Wang, R. J. Wang, X. L. Wang, X. Y. Wang, Z. G. Wang, D. M. Wei, B. B. Wu, J. Wu, X. Wu, X. F. Wu, J. Q. Xia, H. L. Xiao, H. H. Xu, M. Xu, Z. Z. Xu, H. R. Yan, P. F. Yin, Y. W. Yu, Q. Yuan, M. Zha, L. Zhang, L. Y. Zhang, Y. Zhang, Y. J. Zhang, Y. L. Zhang, Z. G. Zhao
The High Energy cosmic-Radiation Detection (HERD) facility is one of several space astronomy payloads of the cosmic lighthouse program onboard China's Space Station, which is planned for operation starting around 2020 for about 10 years. The main scientific objectives of HERD are indirect dark matter search, precise cosmic ray spectrum and composition measurements up to the knee energy, and high energy gamma-ray monitoring and survey. HERD is composed of a 3-D cubic calorimeter (CALO) surrounded by microstrip silicon trackers (STKs) from five sides except the bottom. CALO is made of about 104 cubes of LYSO crystals, corresponding to about 55 radiation lengths and 3 nuclear interaction lengths, respectively. The top STK microstrips of seven X-Y layers are sandwiched with tungsten converters to make precise directional measurements of incoming electrons and gamma-rays. In the baseline design, each of the four side SKTs is made of only three layers microstrips. All STKs will also be used for measuring the charge and incoming directions of cosmic rays, as well as identifying back scattered tracks. With this design, HERD can achieve the following performance: energy resolution of 1% for electrons and gamma-rays beyond 100 GeV, 20% for protons from 100 GeV to 1 PeV; electron/proton separation power better than 10-5; effective geometrical factors of >3 m2sr for electron and diffuse gamma-rays, >2 m2sr for cosmic ray nuclei. R and D is under way for reading out the LYSO signals with optical fiber coupled to image intensified CCD and the prototype of one layer of CALO.
KEYWORDS: Particles, Gamma radiation, Electrons, Chromium, Monte Carlo methods, Atmospheric particles, Crystals, Silicon, Space operations, Wind energy
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.
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