High power millimeter wave experiment of ITER relevant electron cyclotron heating and current drive system

Takahashi, Koji; Kajiwara, Ken; Oda, Yasuhisa; Kasugai, Atsushi; Kobayashi, Noriyuki*; Sakamoto, Keishi; Doane, J.*; Olstad, R.*; Henderson, M.*

Review of Scientific Instruments, 82(6), p.063506_1 - 063506_7, 2011/06

https://doi.org/10.1063/1.3599418

High power, long pulse millimeter (mm) wave experiments of the RF test stand (RFTS) of JAEA were performed. The system consists of a 1 MW/170 GHz gyrotron, a long and short distance transmission line (TL) and an equatorial launcher (EL) mock-up. The RFTS has an ITER-relevant configuration, i.e., that is consisted by a 1 MW-170 GHz gyrotron, mm wave TL and EL mock-up. The TL is composed of a matching optics unit, evacuated circular corrugated waveguides, 6 miter bends, an in-line waveguide switch, an isolation valve. The Gaussian-like beam radiation with the steering capability of 20-40 from the EL mock-up was also successfully proved. The high power long pulse power transmission test was conducted with the metallic load replaced by the EL mock-up, and the transmission of 1 MW/800 s and 0.5 MW/1000 sec were successfully demonstrated with no arcing and no damages. The transmission efficiency of the TL was 96%. The results prove the feasibility of the ITER electron cyclotron heating and current drive system.