The design and performance of GRD onboard the GECAM satellite

Abstract

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.

arXiv comment10 pages, 15 figures

References in corpus (7)

• The Burst Alert Telescope (BAT) on the Swift MIDEX Mission
• Characterisation of SiPMs
• Ground-based calibration and characterization of the Fermi Gamma-Ray Burst Monitor Detectors
• Energy Response of GECAM Gamma-Ray Detector Based on LaBr3:Ce and SiPM Array
• Insight-HXMT observations of the first binary neutron star merger GW170817
• A low-energy sensitive compact gamma-ray detector based on LaBr3 and SiPM for GECAM
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