Design study of ECH system in JT-60SA

Moriyama, Shinichi; Fujii, Tsuneyuki; Seki, Masami; Sawahata, Masayuki; Suzuki, Sadaaki; Yokokura, Kenji; Shimono, Mitsugu; Terakado, Masayuki; Shinozaki, Shinichi ; Hasegawa, Koichi; Hiranai, Shinichi

The JT-60SA will be an upgrade of JT-60U in a combined project of satellite tokamak in ITER broader approach and Japanese national project. The target is to sustain non-inductive current driven plasma at high b (bN=3.5-5.5) for at least 100 s. The JT-60U ECH system will be upgraded as well as the tokamak. The gyrotron power will be 9MW for 100 s. The Europe (EU) side will supply three 140GHz gyrotron systems including high voltage power supplies. Japan (JA) side will fabricate two 140GHz gyrotrons but their high voltage power supplies will be supplied by EU. The rest of the system including transmission line, antenna, 110GHz gyrotrons and their power supplies will be upgraded or fabricated by JA. The system will have four antennas having two-dimensional beam scan capability. The antennas featuring steering mirror driven in the linear motion that are suitable in a fusion-reactor-environment is under development for this purpose.