Comparison between Full Wave and ray-tracing calculations to examine scenarios for electron bernstein wave heating in LHD

Hiroe Igami, Atsushi Fukuyama, Hiroshi Idei, Kazunobu Nagasaki, Yuki Goto, Shin Kubo, Takashi Shimozuma, Yasuo Yoshimura, Hiromi Takahashi, Toru I. Tsujimura, Ryohei Makino

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    2 Citations (Scopus)

    Abstract

    With the use of the density scale length and the magnetic field strength around the O-X mode conversion region in the LHD for 77 GHz EC waves, the full wave calculations by the TASK/WF2D code have been performed. The wave patterns obtained by full wave calculation have been compared with the trajectories obtained by multi ray tracing calculations. For the X-mode and the O-mode reflected near each cutoff, wave patterns obtained by full wave calculations and trajectories obtained by multi ray-tracing correspond to each other well. On the contrary, trajectories of the rays restarted at the high field side of the evanescent region between the plasma and the left handed cutoffs do not cover fully the wave patterns after the O-X mode conversion obtained by full wave calculations. Improvement of the manner to restart the ray-tracing is required. This improvement can provide a more precise view of the propagation of the EBWs and may contribute to examining scenarios for electron Bernstein wave heating.

    Original languageEnglish
    Article number2403098
    JournalPlasma and Fusion Research
    Volume11
    Issue number1
    DOIs
    Publication statusPublished - 2016

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics

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    Igami, H., Fukuyama, A., Idei, H., Nagasaki, K., Goto, Y., Kubo, S., Shimozuma, T., Yoshimura, Y., Takahashi, H., Tsujimura, T. I., & Makino, R. (2016). Comparison between Full Wave and ray-tracing calculations to examine scenarios for electron bernstein wave heating in LHD. Plasma and Fusion Research, 11(1), [2403098]. https://doi.org/10.1585/pfr.11.2403098