Ground calibration of Gamma-Ray Detectors of GECAM-C

TL;DR

This paper details the ground calibration procedures for GECAM-C gamma-ray detectors, validating their performance and Monte Carlo simulations through comprehensive experiments, ensuring reliable gamma-ray transient detection from 6 keV to 6 MeV.

Contribution

It presents the first detailed calibration campaign and data analysis for GECAM-C GRDs, confirming their excellent performance and response characteristics.

Findings

Validated detector energy-channel relation

Achieved high energy resolution and detection efficiency

Confirmed non-uniformity correction effectiveness

Abstract

As a new member of GECAM mission, GECAM-C (also named High Energy Burst Searcher, HEBS) was launched onboard the SATech-01 satellite on July 27th, 2022, which is capable to monitor gamma-ray transients from $\sim$ 6 keV to 6 MeV. As the main detector, there are 12 gamma-ray detectors (GRDs) equipped for GECAM-C. In order to verify the GECAM-C GRD detector performance and to validate the Monte Carlo simulations of detector response, comprehensive on-ground calibration experiments have been performed using X-ray beam and radioactive sources, including Energy-Channel relation, energy resolution, detection efficiency, SiPM voltage-gain relation and the non-uniformity of positional response. In this paper, the detailed calibration campaigns and data analysis results for GECAM-C GRDs are presented, demonstrating the excellent performance of GECAM-C GRD detectors.