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1992 Fiscal Year Final Research Report Summary

Plasma Scattering Measurement Using a Frequency Tunable, Submillimeter Wave Gyrotron as a Power Source

Research Project

Project/Area Number 03680006
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field プラズマ理工学
Research InstitutionFukui University

Principal Investigator

OGAWA Isamu  Fukui University Experimental Institute for Low Temperature Physics Associate Professor, 工学部, 助教授 (90214014)

Co-Investigator(Kenkyū-buntansha) TATSUKAWA Toshiaki  Fukui University Department of Applied Physics Associate Professor, 工学部, 助教授 (00020206)
IDEHARA Toshitaka  Fukui University Department of Applied Physics Professor, 工学部, 教授 (80020197)
Project Period (FY) 1991 – 1992
KeywordsScattering Measurement / Plasma Scattering Measurement / Submillimeter Wave Scattering Measurement / Gyrotron / Submillimeter Wave Gyrotron / Quasi-Optical Antenna
Research Abstract

Objectives: Development of a high frequency gyrotron for high power source (-100 W) operating in the submillimeter wave range, conversion of the output into a high quality beam and its application to plasma scattering measurement.
The results :
1. Development of a submillimeter wave gyrotron as a power source for scattering measurement We stabilized the gyrotron oscillation at the second cyclotron harmonic (f=353 GHz, p=110 W) within 10% of output power during a pulse of 0.6 s. This oscillation is stable enough for scattering measurement. In order to get high frequency output, we have developed a new gyrotron using a 12 T superconducting magnet and succeeded in a single mode oscillation (f=595 GHz, p=220 W) at the second cyclotron harmonic. The maxim frequency attained up to now is 636 GHz.
2. Production of a high quality beam We have made a quasi-optical antenna to converting a gyrotron output into a linearly-polarized, two dimensionally focusing beam. The antenna produces a well collimated beam to the extent of a diffraction effect. In order to improve the focusing and the mode purity of beam, we are making a new transmission line consisting of multi-mirrors, which converts a gyrotron output into a Gaussian beam and couples it to plasma.
3. Plasma scattering measurement using a gyrotron as a power source We have constructed a scattering measurement system consisting of a gyrotron and a quasi-optical antenna and succeeded in observing drift waves in CHS (Compact Helical System in National Institute for Fusion Science) plasma. In the near future, we will improve a scattering measurement system by replacing the quasi-optical antenna with the new transmission line and will observe externally excited wave for plasma heating.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] T.Idehara,T.Tatsukawa,I.Ogawa,S.Wada,Y.Yoshisue,F.Inoue and G.F.Brand: "Single Mode Operation of a Submillimeter Wave Gyrotron at the Third Harmonic Resonance" Phys.of Fluids. B4. 769-770 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] G.F.Brand,T.Idehara,T.Tatsukawa and I.Ogawa: "Mode Competition in a High Harmonic Gyrotron" Int.J.Electronics. 72. 745-758 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 小川 勇,清水 義弘,山岸 康朗,印牧 知広,立川 敏明,出原 敏孝: "サブミリ波ジャイロトロンの開発とプラズマ散乱計測への応用" 電子情報通信学会技術研究報告. ED. 13-18 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Idehara, T.Tatsukawa, I.Ogawa, S.Wada, Y.Yoshisue, F.Inoue and G.F.Brand: "Single Mode Operation of a Submillimeter Wave Gyrotron at the Third Harmonic Resonance" Phys. of Fluids. B4. 769-770 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] G.F.Brand, T.Idehara, T.Tatsukawa and I.Ogawa: "Mode Competition in a High Harmonic Gyrotron" Int. J. Electronics. 72. 745-758 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] I.Ogawa, Y.Shimizu, Y.Yamagishi, T.Kanemaki, T.Tatsukawa and T.Idehara: "Development of Submillimeter Wave Gyrotron and its Application to Plasma Scattering Measurement" Technical Report of IEICE. ED92-108. 13-18 (1992)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1994-03-24  

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