High efficiency cavity design of a 170 GHz gyrotron for fusion applications

Abstract

The design of high power, continuous wave ͑cw͒, 170 GHz gyrotron cavities is considered. The anticipated degradation of efficiency with beam velocity spread places a premium on the optimization of efficiency. For parameters of interest achievement of high efficiency requires utilization of a high quality cavity. Two options are considered: a barrel cavity and a long simple tapered cavity operating at low voltage. The cavities are examined for their sensitivity to velocity spread, their mode competition, and their maximum Ohmic power dissipation. © 1997 American Institute of Physics.

A Feasibility Study of Beam-Wave Interaction in 670 GHz Gyrotron for Radioactive Material Detection Application

“…¼ =T (T is the transient time of the electrons through the resonator) are considered in the start oscillation current calculation. 26) The start oscillation current curves for the operating mode and its neighboring competing modes are shown in Fig. 1.…”

Design of 95 GHz, 2 MW Gyrotron for Communication and Security Applications

“…Figure 1a and b show the SOC curves of various neighbouring modes with respect to the cavity magnetic field and the coupling coefficient as the function of the ratio of beam radius and cavity radius, respectively. The SOC is calculated for the modes lies in the amplification band Δω = π/T, where T is transient time of the electrons moving through the resonator [17]. The detuned interaction cavity magnetic field is optimized 3.8 T and thus the interaction cavity operates in the hard excitation region.…”