High efficiency coupling of gyrotron output with the long distance waveguide system

摘要

The high power gyrotron and the power coupling efficiency with the corrugated waveguide are discussed. The 170GHz transmission lines(TLs) for electron cyclotron heating and current drive (EC H&CD) system in the International Thermonuclear Experimental Reactor (ITER) require higher purity of HEn mode to minimize a transmission loss. In addition, higher order modes will generate a stray RF in the millimeter wave launching system which is installed at the end of the transmission line.