1995 Fiscal Year Final Research Report Summary
Induction of plasma rotation and improvement of radial confinement
| Project/Area Number |
06452421
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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 | KYOTO UNIVERSITY |
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Principal Investigator |
YASAKA Yasuyosi Kyoto Univ., Grad.School of Eng., Assoc.Professor, 工学研究科, 助教授 (30109037)
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| Co-Investigator(Kenkyū-buntansha) |
KUDO Makoto Kyoto Univ., Grad.School of Eng., Instructor, 工学研究科, 助手 (80089127)
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| Project Period (FY) |
1994 – 1995
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| Keywords | tandem mirror / ICRF wave / electrostatic biasing / radial confinement / sheared rotation / nonlinear mechanism |
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| Research Abstract |
A goal of this study is high radial confinement mode with reduction of edge fluctuation and with formation of sheared plasma rotation by DC electric fields and ICRF wave.
The DC limiter biasing experiment showed that a high radial confinement mode similar to H-mode is possible in a tandem mirror plasma. Thus, hysteresis phenomena are found with the azimuthal rotation and its shear in radial edge. This phenomena have been explained by a model from tokamak H-mode analysis, using a momentum balance equation.
ICRF wave (1.5MHz) is lauched from high magnetic field side in a two-ion plasma, and contributes to ion heating by slow wave (m=+1 mode) and that via mode convesion from fast wave (m=-1 mode) into slow wave. With end plate biasing, reduction of drift wave fluctuation in edge plasma, an increase of bulk density and diamagnetism and the hysteresis phenomena, which is similar to that of limiter biasing, are observed. In the combination of ion heating by ICRF wave (1.5MHz) and end plate biasing, a plasma with density - 1.2*10^<13>cm^<-3> and beta value 4.7% is produced and the effects of end plate biasing in the heating plasma are confirmed.
In He plasma with density - 1.0*10^<12>cm^<-3>, radial rotation is enhanced and coherent fluctuation in edge plasma reduces by non-resonant ICRF wave. The azimuthal rotation in edge region is observed. This rotation velocity is explained by E*B rotation velocity which is measured by a Langmuir probe. By increase of non-resonant ICRF wave, increase of edge fluctuation and radial diffusion of particle are observed.
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Research Products
(12 results)
