Progress in the Development of a 1 -MW, CW Gyrotron at 140 GHz for Fusion Plasma Heating

摘要

High frequency gyrotrons with high output power are mainly developed for microwave heating and current drive in plasmas for thermonuclear fusion experiments. Electron cyclotron resonance heating (ECRH) has proven to be an important tool for plasma devices especially for stellarators, as it provides both net current free plasma start up from the neutral gas and efficient plasma heating [1]. The development of high power gyrotrons (118 GHz, 140 GHz) in continuous wave operation (CW) has been in progress for several years in a joint collaboration between different European research institutes and industrial partners. The major problems of high-power high-frequency gyrotrons are given by the Ohmic heating of the cavity surface, by internal stray radiation, by the dielectric losses in the output window and by the power capability of the collector.