Validation of 3-D Time Domain Particle-in-Cell Simulations for Cold Testing a $W$ -Band Gyrotron Cavity

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IEEE Transactions on Plasma Science, ISSN: 0093-3813, Vol: 42, Issue: 12, Page: 3989-3995

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Sawant, Ashwini; Kim, Sung Gug; Lin, Ming-Chieh; Kim, Jung Ho; Hong, Yongjun; So, Joonho; Choi, EunMi
Institute of Electrical and Electronics Engineers (IEEE); IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Physics and Astronomy; Conformal finite-difference time-domain (CFDTD) simulation; gyrotron cavity; MAGIC; PIC code; VSim
article description
This paper evaluates the performance and reliability of a commercially available 3-D conformal finite-difference time-domain particle-in-cell (PIC) code, VSim, for cold test simulations of a gyrotron cavity. An interaction cavity for a 95-GHz gyrotron is simulated and optimized using the VSim PIC code to achieve TEmode excitation. The optimized cavity design is also studied and compared using the commercially available numerical code, CASCADE, and PIC code, MAGIC. A rigorous analysis of the simulation results obtained through VSim and MAGIC is performed using the CASCADE results as a reference. The performance of VSim is also compared with MAGIC based on its accuracy for calculating the resonant frequency and quality factor. Finally, the optimized cavity is fabricated and experimentally tested to measure the resonant frequency and the quality factor. The experimental results confirm the reliability and accuracy of the VSim cold cavity results.