Heating and generation of suprathermal electrons by nonlinear Landau:damping of Bernstein waves
Project/Area Number |
03680013
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Research Category |
Grant-in-Aid for General Scientific Research (C)
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Allocation Type | Single-year Grants |
Research Field |
プラズマ理工学
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Research Institution | Ehime University |
Principal Investigator |
SUGAWA Masao Ehime University, Faculty of Science, Department of Physics Associate Professor, 理学部, 助教授 (60036415)
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Project Period (FY) |
1991 – 1992
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Project Status |
Completed (Fiscal Year 1992)
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Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1992: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1991: ¥1,500,000 (Direct Cost: ¥1,500,000)
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Keywords | nonlinear Landau damping / Bernstein wave / self interaction / electron cyclotron emission / suprathermal electron / far infrared spectrometry / Fabry-Perot interferometer / 低域混成波 / パラメトリック励起 / プラズマ加熱 / 電流駆動 / 電子サイクロトロン〓射 |
Research Abstract |
(1) We observed the self-interaction due to nonlinear Landau damping for waves of the relatively small kappa_<11>, as Bernstein waves (B waves) of the large amplitude are excited in a plasma of a small linear device. This self-interaction occurs in spatially localized positions, and beat waves via this wave particle interaction appears in their positions. This interaction occurs in a relatively broad frequency range. (2) Heating of the bulk plasma electrons occurs only for the excitation of B waves with a relatively small kappa_<11>. This heating is observed in localized positions of the appearance of beat waves. These results agree well with the results of the numerical analysis. (3) For B waves with a large kappa_<11>, the fast tail electrons are generated by the quasi-linear cyclotron damping of the B wave itself. (4) In far infrared spectrometry, an interference low pass filter made with the appropriate sized glass beads is used to cut well the harmonics of Fabry-Perot interferometer. (5) Electron cyclotron emission from the lower hybrid current driven WT-3 was measured along the vertical chord where the toroidal field is constant. Measurements show that the suprathermal electron with energy of 110 keV carrying the plasma current is generated, these energetic electrons are scattered to the perpendicular direction in velocity space, and the effective temperature of tail electrons increases up to 60 keV.
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Report
(3 results)
Research Products
(19 results)