Analysis and Reduction Electromagnetic Interference to Icts Caused by Pulsed Power Supply Excitation in Nsrrc*

The purpose of this paper is to eliminate the Electromagnetic Interference (EMI) from kicker power supply. Analysis of the EMI source and the propagation path are the beginning missions. The radiated and conducted EMI both affected the Integral Current Transformer (ICT) normal operation because of the space limitation for TLS in NSRRC. The ICT is to measure injection efficiency, thus, ICT located just behind the kickers and using the common girder. The EMI signals therefore are much higher than the electron beam currents and the integral values of the sensor are not correct. For reducing and eliminating the interference of electromagnetic waves, a hybrid segregation and grounding method was used [1]. The EMI wrapper was enclosed the ICT and its high frequency amplifier separately to prevent the radiated EMI from the space. The grounding paths provided the possible stray current dredge to the ground loop. It reduced the stray current spread to the subsystems next to the kickers. The conducted and radiated EMI therefore reduced over 95% and the injection efficiency could be calculated successfully. The elimination of the EMI from kicker itself will be the next step in the future.