Development of a Plasma Diagnostics System Using an Impulse Waveform Voltage

• TOKUZAWA Tokihiko

  National Institute for Fusion Science, Toki 509-5292, Japan

• KAWAHATA Kazuo

  National Institute for Fusion Science, Toki 509-5292, Japan

• ITO Yasuhiko

  National Institute for Fusion Science, Toki 509-5292, Japan

• TANAKA Kenji

  National Institute for Fusion Science, Toki 509-5292, Japan

• YAMADA Ichihiro

  National Institute for Fusion Science, Toki 509-5292, Japan

• LHD Experimental Group

  National Institute for Fusion Science, Toki 509-5292, Japan

抄録

A new application using an electric impulse signal has been developed for electron density profile measurements in the Large Helical Device (LHD). Using an impulse waveform voltage, which has broadband frequency components, we constructed an ultrashort pulsed radar reflectometer with 28 channels in X-, Ka-, and U-band frequency components. The effect of the bandwidth of an inline band-pass filter was investigated, and was optimized. For a multiple-channel and multiple-frequency band system, a new switching technique and multiplexer were developed. Using the Abel inversion method, the reconstructed electron density profile was obtained from the delay time as a function of the probing frequency. Good agreement with other diagnostics was obtained.

収録刊行物

• Plasma and Fusion Research

  Plasma and Fusion Research 3 018-018, 2008

  一般社団法人 プラズマ・核融合学会

キーワード

• impulse
• microwave radar
• electron density profile
• microwave reflectometer
• LHD

詳細情報

• CRID: 1390282680230565888
• NII論文ID: 130000263900
• DOI: 10.1585/pfr.3.018
• ISSN: 18806821
• HANDLE: 10655/6350
• Web Site: https://nifs-repository.repo.nii.ac.jp/records/210
• Web Site: http://www.jstage.jst.go.jp/article/pfr/3/0/3_0_018/_pdf
• 本文言語コード: en
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