Study of long-pluse high-power 170GHz gyrotron for fusion plasma ECRH

Abstract

The MW gyrotrons are key devices in ECRH of magnetic confinement nuclear fusion systems. In order to achieve the high power and long pulse of the 170GHz gyrotron, which are adopted in the CFETR, a TE25.10-mode 170GHz gyrotron research are given in this paper. A single-anode magnetron injection gun (MIG) and the cylindrical resonant cavity operating are designed and optimized by PIC. The theoretical output power of the gyrotron with operating Voltage 75kV, electron current 45A is about 1.1MW, corresponding to electron efficiency of 32.6%. The gyrotron has been fabricated with the single-depressed collector and quasi-optical mode converter and will be tested in the future.