Stable, Single-Mode Oscillation with High-Order Volume Mode at 1 MW, 170 GHz Gyrotron

Abstract

A stable, 1.13 MW single-mode oscillation was obtained at 170 GHz in a short-pulse gyrotron with a high-order volume mode TE 31,8 . The maximum efficiency was 30%, and no power degradation due to mode competition was observed. This result indicates the potential for the development of a 170 GHz, 1 MW, CW gyrotron which is required for electron cyclotron heating and current drive of large fusion devices.