The CPD mainly applies to detect space electrons at 300 keV–5 MeV. By monitoring the charged particle flow intensity in the space environment, CPD can identify gamma-ray bursts and space charged particle events to achieve the identification of space particle bursts. In addition, CPD can study the onboard background of GECAM. To meet the detection requirement for CPD, a design scheme was adopted where the plastic scintillator is used as a sensitive material for detection and silicon photomultiplier (SiPM) as an optical readable device. For more details, please refer to: https://link.springer.com/article/10.1007/s41605-021-00298-x.

Figure: The shape and the structure diagram of CPD.

Figure: Simulation results of the detection efficiency of GRD and CPD for gamma rays and charged particles.