Validation of 3-D Time Domain Particle-in-Cell Simulations for Cold Testing a <inline-formula> <tex-math notation="LaTeX">$W$ </tex-math></inline-formula>-Band Gyrotron Cavity

Abstract

This paper evaluates the performance and reliability of a commercially available 3-D conformal finite-difference timedomain 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 TE 6,2 mode 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.

System Development and Performance Testing of a W-Band Gyrotron

“…The resonant frequency and quality factor obtained were 95.15 GHz and 904, respectively. The simulation results of this cold test of the cavity were confirmed experimentally with a nondestructive method in our previous study [27].…”

“…The experimentally measured electric field intensity in each plane shows good agreement with the simulation. The performance of the mode converter can be quantified by comparing experimental results to simulation using a cross-correlation function (CCF), defined using both the amplitudes and phases and expressed as follows, from [27]:…”

Proposal of Mode Selection Criterian for Advanced KDEMO Gyrotron

“…conventional cavity [4] and coaxial cavity [5] are the two popular type of cavities inherited for gyrotron design. In case of High Power Gyrotron ex.…”