Study of linearity of LYSO crystal for HERD calorimeter

分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-11-10

Zheng Quan Zhi-gang Wang Ming Xu Yong-wei Dong Jun-jing Wang Guang-peng An Xin Liu Tian-wei Bao Li Zhang Rui-jie Wang Jun-guang Lv Bo-bing Wu Shuang-nan Zhang

摘要： The High Energy cosmic Radiation Detection (HERD) facility is a space mission designed for detecting cosmic ray (CR) electrons, γ-rays up to tens of TeV and CR nuclei from proton to iron up to several PeV. The main instrument of HERD is a 3-D imaging calorimeter (CALO) composed of nearly ten thousand cubic LYSO crystals. A large dynamic range of single HERD CALO Cell (HCC) is necessary to achieve HERD’s PeV observation objectives, which means that the response of HCC should maintain a good linearity from minimum ionizing particle (MIP) calibration to PeV shower maximum. In order to study the linearity of HCC over such a large energy range, a beam test has been implemented at the E2 and E3 beam lines of BEPC. High intensity pulsed electron beam provided by E2 line are used for producing high energy density within HCC; π+/proton provided by E3 line are used for HCC calibration. The results show that no saturation effect occurs and the linearity of HCC is better than 10% from 30 MeV (1 MIP) to 1.1×103 TeV (energy density is 93 TeV/cm3), which can meet the requirement mentioned above.

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