The Very Large Area Gamma-ray Space Telescope Pathfinder (VLAST-P), as the technology validation satellite for the VLAST mission, is designed to observe high-energy solar bursts on orbit. The CsI electromagnetic calorimeter (ECAL) is one of the key sub-detectors of VLAST-P. To investigate the on-orbit energy calibration method of the ECAL, a Geant4-based simulation of VLAST-P was carried out. The results show an energy resolution better than 10% in the 0.1 to 5 GeV range and a linearity deviation below 2%. A dedicated minimum-ionization-particle (MIP) calibration method was developed to ensure accurate energy reconstruction and to monitor detector stability throughout the in-orbit calibration period.
@article{arxiv.2511.07944,
title = {A Method for On-Orbit Calibration of the VLAST-P Electromagnetic Calorimeter},
author = {Jiaxuan Wang and Zhen Wang and Borong Peng and Renjun Wang and Yunlong Zhang and Zhongtao Shen and Yifeng Wei and Dengyi Chen and Xiang Li and Yiming Hu and Jianhua Guo},
journal= {arXiv preprint arXiv:2511.07944},
year = {2026}
}