Electron cyclotron emission measurements by means of a grating polychromator on the large helical device

P. C. De Vries, K. Kawahata, Y. Nagayama, S. Inagaki, H. Sasao, Y. Ito

研究成果: ジャーナルへの寄稿学術誌査読

3 被引用数 (Scopus)

抄録

The electron cyclotron emission (ECE) spectrum at the large helical device (LHD) is measured by a 14-channel grating polychromator. During standard operation, the polychromator monitors second harmonic frequencies (100-150 GHz). At sufficient high density, the second harmonic X-mode polarisation is optically thick and can be used to determine the temperature profile. However, the large magnetic field shear in LHD affects the ECE polarisation. This effect has been studied numerically. The wave polarisation was found to rotate in the laboratory frame. Eperiments have been carried out by means of a polarisation rotator in the diagnostic waveguide system, which confirmed the calculations. By a proper setting of the polarisation rotator, the rotation can be corrected and pure X-mode is detected. Temperature profiles have been measured successfully by the polychromator.

本文言語英語
ページ(範囲)185-191
ページ数7
ジャーナルFusion Engineering and Design
53
1-4
DOI
出版ステータス出版済み - 1月 2001
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 土木構造工学
  • 原子力エネルギーおよび原子力工学
  • 材料科学(全般)
  • 機械工学

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