PIC simulation of a millimeter wave gyrotron for DNP/NMR application

In this paper, the design and simulation studies of a millimeter wave gyrotron is presented for DNP/NMR applications. The RF interaction cavity is designed to operate in a higher order TE52 mode resonating at 250 GHz. The Eigen mode analysis of gyrotron cavity with and without taper has been studied for mode confinement and Q-factor calculation. The Particle-in-Cell (PIC) simulation is used to study the transient behavior of the device. The hot simulation produced a continuous wave (CW) RF power of ~ 108 W in TE52 mode at 249.9 GHz with a wide instantaneous bandwidth 3 GHz centered about 250 GHz. The magnetic field has been optimized as 9.1 Tesla.