Measurements of HHFW profile in UTST

POSTER

Abstract

HHFW (high-harmonic fast wave, f = 21 MHz) experiments were performed on the UTST spherical tokamak (R= 0.38 m, a = 0.25 m, B$_{t}$ = 0.1 T, I$_{p}$ = 0.1 MA) [T. Yamada, this session]. The HHFW antenna consists of two poloidal current straps separated in the toroidal direction. The spatial profile of the HHFW field was measured by a 2-dimensional array of magnetic probes inserted into the plasma 45\r{ } away from the antenna toroidally. 40 channels of RF data can be acquired simultaneously by fast digitizers (1 GHz sampling frequency) out of 81 probes. A comparison of wave fields measured with out-of-phase two-strap excitation (high parallel wavenumbers) and with single strap excitation (low parallel wavenumbers) indicate higher RF fields inside the plasma for the same input power. The experimental data will be compared with results of wave field calculation.

Authors

  • Takuma Wakatsuki

    • University of Tokyo
    • Univ. Tokyo
    • The University of Tokyo

  • Takuya Oosako

    • University of Tokyo

  • Hiroaki Kobayashi

    • University of Tokyo
    • Univ. Tokyo
    • The University of Tokyo

  • T. Yamada

    • University of Tokyo
    • The University of Tokyo
    • Univ. Tokyo

  • Bung Il An

    • University of Tokyo
    • Univ. Tokyo
    • The University of Tokyo
    • MIT

  • R. Imazawa

    • University of Tokyo
    • The University of Tokyo
    • Univ. Tokyo

  • K. Abe

    • University of Tokyo
    • The University of Tokyo
    • Univ. Tokyo

  • Akira Ejiri

    • University of Tokyo
    • Univ. Tokyo
    • The University of Tokyo

  • Kentaro Hanashima

    • University of Tokyo
    • The University of Tokyo

  • Hiroyuki Hayashi

    • University of Tokyo
    • The University of Tokyo

  • R. Hihara

    • University of Tokyo
    • The University of Tokyo
    • Univ. Tokyo

  • Junichi Hiratsuka

    • University of Tokyo
    • The University of Tokyo

  • M. Inomoto

    • University of Tokyo
    • The University of Tokyo
    • Univ. Tokyo

  • Hidetoshi Kakuda

    • University of Tokyo
    • The University of Tokyo

  • S. Kamio

    • University of Tokyo
    • The University of Tokyo
    • Univ. Tokyo

  • Hiroki Kurashina

    • University of Tokyo
    • The University of Tokyo

  • Yoshihiko Nagashima

    • University of Tokyo
    • Univ. Tokyo
    • The University of Tokyo

  • Yasushi Ono

    • University of Tokyo
    • The University of Tokyo
    • Univ. Tokyo

  • Takuya Sakamoto

    • University of Tokyo
    • The University of Tokyo

  • M. Sakumura

    • University of Tokyo
    • The University of Tokyo
    • Univ. Tokyo

  • Q.H. Cao

    • University of Tokyo
    • The University of Tokyo
    • Univ. Tokyo

  • Yuichi Takase

    • University of Tokyo
    • The University of Tokyo
    • Univ. Tokyo

  • Osamu Watanabe

    • University of Tokyo
    • The University of Tokyo

  • Takashi Yamaguchi

    • University of Tokyo
    • The University of Tokyo

  • Kotaro Yamada

    • University of Tokyo
    • The University of Tokyo