GECAM卫星上的GRD的设计和性能
The design and performance of GRD onboard the GECAM satellite
摘要：
背景资料：每个GECAM卫星有效载荷包含25个伽马射线探测器（GRD），可以探测伽马射线和粒子，并可以粗略定位伽马射线暴（GRB）。GRD采用溴化镧（LaBr 3）晶体作为敏感材料，后端耦合硅光电倍增器（SiPM）阵列读出。目的：在地面反应堆的航天工程设计中，有许多关键问题需要研究。本文介绍了GRD的具体设计方案、探测器的组装和性能测试结果。方法：基于蒙特卡罗模拟和实验测试结果，优化GRD的具体方案设计和组装工艺。GRD组装完成后，进行了放射源性能试验和随机振动试验。结果与结论：测试结果表明，所有星载GRD在59.5keV能量下的能量分辨率均小于16%，满足卫星科学性能要求。随机振动试验表明，GRD能够保持稳定的性能，满足空间应用的要求。
英文摘要：
Background: Each GECAM satellite payload contains 25 gamma-ray detectors (GRDs), which can detect gamma-rays and particles and can roughly localize the Gamma-Ray Bursts (GRBs). GRD was designed using lanthanum bromide (LaBr3) crystal as the sensitive material with the rear end coupled with silicon photomultiplier (SiPM) array for readout. Purpose: In aerospace engineering design of GRD, there are many key points to be studied. In this paper, we present the specific design scheme of GRD, the assembly and the performance test results of detectors. Methods: Based on Monte Carlo simulation and experimental test results, the specific schematic design and assembling process ofGRDwere optimized. After being fully assembled, theGRDswere conducted performance tests by using radioactive source and also conducted random vibration tests. Result and conclusion: The test results show that all satellite-borne GRDs have energy resolution <16% at 59.5 keV, meeting requirements of satellite in scientific performance. The random vibration test shows that GRD can maintain in a stable performance, which meets the requirement of spatial application.
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