Experimental results and outlook of the 2 MW 170 GHz coaxial-cavity gyrotron towards long pulse operation

摘要

The development of the modular short-pulse pre-prototype as base for the 2 MW, 170 GHz, CW coaxial-cavity gyrotron for international fusion project ITER and beyond is in progress at Karlsruhe Institute of Technology (KIT). The current modular pre-prototype configuration allows the generation of > 2 MW RF output power in short-pulses with a reasonable electronic efficiency of approximately 30 % without depressed collector operation. Recently, experiments with a new glidcop resonator has been performed. In depressed operation the overall efficiency of the gyrotron has been increased to ???48 %. In addition, an advanced water cooling system for a long pulse 2 MW gyrotron was developed. In this paper the experimental results, the suppression of the beam-halo and future plans for the 2 MW gyrotron will be presented.