1993 Fiscal Year Final Research Report Summary
CONTROL OF TURBULENT WAVES BY END PLATE BIASING
| Project/Area Number |
04452307
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
プラズマ理工学
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| Research Institution | UNIVERSITY OF TSUKUBA |
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Principal Investigator |
MASE Atsushi INSTITUTE OF APPLIED PHYSICS ASSOCIATE PROFESSOR, 物理工学系, 助教授 (00023325)
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| Co-Investigator(Kenkyū-buntansha) |
HOJO Hitoshi INSTITUTE OF PHYSICS ASSOCIATE PROFESSOR, 物理学系, 助教授 (30116660)
ISHII Kameo INSTITUTE OF PHYSICS ASSOCIATE PROFESSOR, 物理学系, 助教授 (10015844)
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| Project Period (FY) |
1992 – 1993
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| Keywords | PLASMA / INSTABILITY / END PLATE / POTENTIAL CONTROL / STABILIZATION |
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| Research Abstract |
1)During the period of this research project, two diagnostic systems have been developed for the measurements of density fluctuations as well as density profiles of the GAMMA 10 tandem mirror.
i)The 70 GHz Fraunhofer-diffraction apparatus has been newly installed to the centrall cell plasma (z=2.4m). A new rectangular antenna array which functions as a spectroscopic slit in the plane of observation enabled to attain a good signal to noiseratio.
ii)The 7-18 GHz and 18-26 GHz, X-mode and O-mode reflectometers were also designed and have applied to the centrall cell plasma (z=0m and 1.8m) for the meausrements of radial distribution of the fluctuations.
2)The potential control of plasmas was carried out by applying a bias voltage to the end plates for two operational modes of GAMMA 10. The main results are the following.
i)In the ECRH-start mode with broad density profiles, the density fluctuations satisfying the dispersion relation of drift waves were suppressed by increasing the radial elect
… More
ric field regardless of its sign. The suppression of turbulence allowed the enhancement of the plasma parameters such as the density and the diamagnetic loop signal, and lowered the Halpha signal.
ii)In the ICRF-start mode with narrow density profiles, the rotational instabilities with the lowest azimuthal mode number were predominantly excited during the formation of confining potentials. They were supressed by applying the moderate negative bias to lower the radial electric field.
iii)The present study shows that it is possible to control plasma instabilities by shaping the radial potential profiles using segmented end plates so as to suppress radial ambipolar transport.
3)The reflectometers have been appllied for the measurement of fluctuations with ion cyclotron range of frequency (ICRF).
i)The wave with omega<omega_<ci> was identified as the electromagnetic Alfven ion cyclotron (AIC) wave.
ii)It was shown that the internal magnetic fluctuations can be determined from the ratio of X-to O-mode signals.
iii)The reflectometers was also used to monitor the applied ICRF, the deposition profile of the ICRF power. Less
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Research Products
(42 results)
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[Publications] T.Cho, M.Hirata, E.Takahashi, K.Ogura, K.Masai, N.Yamaguchi, T.Kondoh, K.Matsuda, H.Hojo, M.Inutake, K.Ishii, Y.Kiwamoto, A.Mase, T.Saito, K.Yatsu, and S.Miyoshi: "X-Ray Studies of Various Shapes of Electron-Velocity Distribution Functions and of Electron Confinement Affected by Kilovolt-Range Electrostatic Potentials" Phys. Rev. A. Vol.45, No.4. pp. 2532-2545 (1992)
Description
「研究成果報告書概要(欧文)」より
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[Publications] M.Ichimura, M.Inutake, R.Katsumata, N.Hino, H.Hojo, K.Ishii, T.Cho, M.Hirata, A.Itakura, I.Katanuma, Y.Kiwamoto, A.Mase, S.Miyoshi, Y.Nakashima, T.Saito, T.Tamano, N.Yamaguchi, and K.Yatsu: "Observation of AIC Mode in ICRF-Heated Plasmas in the Central Cell of GAMMA 10 Tandem Mirror" Plasma Phys. and Controlled Fusion. Vol.34, No.13. pp. 1889-1894 (1992)
Description
「研究成果報告書概要(欧文)」より
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[Publications] M.Inutake, T.Tamano, T.Cho, M.Hirata, H.Hojo, M.Ichimura, K.Ishii, A.Itakura, I.Katanuma, Y.Kiwamoto, A.Mase, S.Miyoshi, Y.Nagayama, Y.Nakashima, T.Saito, Y.Tatematsu, N.Yamaguchi, K.Yatsu, Y.Yasaka, O.Sakai, M.Shima, H.Yoshida, and R.Itatani: "Confinement Scaling, Heating and Stability in the GAMMA 10 and HIEI Tandem Mirrors" in Plasma Physics and Controlled Nuclear Fusion Research 1992 (IAEA,Vienna. Vol.2. pp. 651-658 (1993)
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「研究成果報告書概要(欧文)」より
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[Publications] A.Mase, M.Ichimura, H.Satake, R.Katsumata, T.Tokuzawa, Y.Ito, H.Hojo, E.J.Doyle, A.Itakura, M.Inutake, and T.Tamano: "Measurement of Alfven Ion-Cyclotron Wave using Both X- and O-Mode Reflectometers" Phys. Fluids B. Vol.5, No.6. pp. 1677-1680 (1993)
Description
「研究成果報告書概要(欧文)」より
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[Publications] A.Mase, A.Itakura, T.Tokuzawa, Y.Ito, H.Satake, H.Hojo, M.Ichimura, M.Inutake, K.Ishii, R.Katsumata, and T.Tamano: "Microinstabilities in the Central Cell Plasma of GAMMA 10" Int. Conf. on Open Plasma Confinement Systems for Fusion, Novosibirsk, June 1993 World Scientific. to be published in Open Systems.
Description
「研究成果報告書概要(欧文)」より
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[Publications] M.Inutake, A.Ishihara, R.Katsumata, M.Ichimura, A.Mase, K.Ishii, Y.Nakashima, Y.Nagayama, N.Yamaguchi, H.Hojo, I.Katanuma, and T.Tamano: "Potential Profile Control and MHD Stability of GAMMA 10 ICRF-Heated Plasmas" Int. Conf. on Open Plasma Confinement Systems for Fusion, Novosibirsk, June, 1993 World Scientific. to be published in Open Systems.
Description
「研究成果報告書概要(欧文)」より
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[Publications] M.Ichimura, R.Katsumata, M.Inutake, A.Ishihara, H.Hojo, I.Sasaki, K.Ishii, A.Mase, Y.Nakashima, and T.Tamano: "Experimental Study of Alfven-Ion-Cyclotron Mode in the GAMMA 10 Tandem Mirror" Int. Conf. on Open Plasma Confinement Systems for Fusion, Novosibirsk, June, 1993 World Scientific. to be published in Open Systems.
Description
「研究成果報告書概要(欧文)」より
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[Publications] R.Katsumata, M.Inutake, M.Ichimura, A.Ishihara, A.Mase, Y.Nakashima, K.Ishii, H.Hojo, I.Katanuma, and T.Tamano: "Stability Study Related to Pressure Anisotropy in the GAMMA 10 Tandem Mirror" Proc. 20th EPS Conf. on Controlled Fusion and Plasma Physics, Lisboa. Vol.17C,Part II. pp. 545-548 (1993)
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「研究成果報告書概要(欧文)」より
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[Publications] M.Ichimura, M.Inutake, R.Katsumata, A.Ishihara, A.Mase, H.Hojo, K.Ishii, Y.Nakashima, I.Katanuma, and T.Tamano: "Stability of ICRF-Heated Plasmas in the GAMMA 10 Tandem Mirror" Proc. 5th Int. Toki Conf. on Plasma Physics and Controlled Nuclear Fusion. Nov., 1993(in press).
Description
「研究成果報告書概要(欧文)」より
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