Coupling Model Research of Electromagnetic Pulse Interference Generated by Pulsed Radiation on Vacuum Compton Detector Response

When X-rays and gamma rays irradiate a vacuum Compton detector (VCD), photoelectrons and Compton electrons are generated on the cavity surface, resulting in a strong internal electromagnetic pulse (IEMP) in the cavity. To quantify the characteristics of the IEMP interference on VCD response, an electromagnetic interference-coupling model for a VCD was established with computer simulation technology particle studio (CST PS). The accuracy of the model was verified under pulsed gamma conditions. The characteristics of electromagnetic interference were studied by simulation and experimental methods under a 50 ps pulsewidth electron accelerator. The results are in good agreement in time and frequency. The effects of absorbing materials to strengthen anti-electromagnetic interference of the VCD were simulated using the model. The possible sources of interference signals were discussed as well. The coupling model presented in this article provides an efficient and accurate tool for the anti-electromagnetic interference design of VCDs under pulsed X-rays, gamma ray, and electron radiation.