PLASMA CONFINEMENT IN HYBRID STELLARATOR WITH L=2 AND L=3 HELICAL FIELDS
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概要
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Dependences of plasma transport on the rotational trans-form angle and the shear as well as the plasma parameters are studied using JIPP Ib stellarator which equips both l=2 and l=3 helical windings. Afterglow plasmas produced by electron cyclotron resonant heating and P. I. G. discharge are used. The properties of the resonant losses observed in the afterglow plasmas in the rational cases of the l=2 stellarator field are investigated and the shear effect on the resonant losses is examined by superposing the l=3 helical field. It is found that the plasma loss is due to the onset of dissipative drift instability including toroidal effects. The observed properties of the fluctuations such as the frequency, the wave propagation etc. can be explained by the instability. The introduction of weak shear (shear length L_s∿300cm) reduces the resonant loss in our experimental conditions. When the instability is suppressed, the confinement time becomes long (τ≃60∿200ms, T_e=0.6 eV, B_t≃0.8∿3kG). Ohmic heating of plasma is carried out with a programmed vertical field for equilibrium. The density is about 5×10^<12>cm^-3 and the conductivity temperature is about 120 eV. The plasma current is limited by (l_I+l_h)/2π>0.5,where l_I and l_h are the rotational transform angles due to the plasma current and the helical field, when l_h/2π>0.5. The confinement time is around that of pseudo-classical one.
- 核融合科学研究所の論文
著者
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Fujiwara M.
Research Center for Nuclear Physics, Osaka. University
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Yatsu K.
Research Information Center, Institute of Plasma Physics, Nagoya University
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Kawahata K.
Research Information Center Institute Of Plasma Physics Nagoya University
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Miyamoto K.
Dept. Biol. Fac. Sci. Tokyo Metro. Univ.
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Fujiwara M.
Institute of Plasma Physics, Nagoya University
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Miyamoto K.
Research Information Center, Institute of Plasma Physics, Nagoya University
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Terashima Y.
Research Information Center, Institute of Plasma Physics, Nagoya University
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Fujiwara M.
Institute Of Plasma Physics Nagoya University
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Dodo T.
Research Information Center, Institute of Plasma Physics, Nagoya University
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Yatsu K.
Research Information Center Institute Of Plasma Physics Nagoya University:plasma Research Center Uni
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Terashima Y.
Institute Of Plasma Physics Nagoya University
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Terashima Y.
Research Information Center Institute Of Plasma Physics Nagoya University:jipp T-ii Group
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Miyamoto K.
Research Information Center Institute Of Plasma Physics Nagoya University:jipp T-ii Group
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Yatsu K.
Research Information Center Institute Of Plasma Physics Nagoya University:department Of Physics Tokyo University Of Education
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Dodo T.
Research Information Center Institute Of Plasma Physics Nagoya University:central Research Laboratory Hitachi Limited
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Fujiwara M.
Research Center for Nuclear Physics, Osaka University
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