H. Idei, M. Sakaguchi, E.I. Kalinnikova, K. Nagata, A. Fukuyama, H. Zushi, K. Hanada, M. Ishiguro , H. Igami, S. Kubo, K. Nakamura, A. Fujisawa, M. Sakamoto, M. Hasegawa, Higashizono, S. Tashima,, R. Ogata, H. Q. Liu, I. Goda, T. Ryokai, S. K. Sharma, M. Isobe, A. Ejiri K. Nagaoka, M. Osakabe, A. Tsushima, H. Nakanishi, T. Morisaki,, N. Nishino, Y. Nakashima, H. Watanabe, K. Tokunaga, T. Tanabe, N. Yoshida1), K.N. Sato, S. Kawasaki, H. Nakashima, A. Higashijima, Y. Takase, T. Maekawa, O. Mitarai M. Kikuchi, K. Toi and Y. Kishimoto
Phased-array Antenna System for Electron Bernstein Wave Heating and Current Drive Experiments in QUEST
Date of publication:
22 IAEA Fusion Energy Conference, EXW/P7-19
22 IAEA Fusion Energy Conference, EXW/P7-31 The phased-array antenna system for Electron Bernstein Wave Heating and Current Drive (EBWH /CD) experiments has been developed in the QUEST. The antenna was designed to excite a pure O-mode wave in the oblique injection for the EBWH/CD experiments, and was tested at a low power level. The measured two orthogonal fields were in excellent agreements with the fields evaluated by a developed Kirchhoff code. The heat load and thermal stress in CW 200 kW operation were analyzed with finite element codes. The phased array has been fast scanned [~10^4 degree/s] to control the incident polarization and angle to follow time evolutions of the plasma current and density. The RF startup and sustainment experiments were conducted using the developed antenna system. The plasma current (< ~15kA) with an aspect ratio of 1.5 was started up and sustained by only RF injection. The long pulse discharge of 10 kA was attained for 40 s with the 30kW injection.