The Finite Beta Effects on the Toroidal Field Ripple in a Tokamak Plasma

The efficiency of energetic ion confinement is reduced in a tokamak plasma by the non-axisymmetric field, namely the ripple field. The ripple field is produced by a finite number of toroidal field coils. It is affected by the non-axisymmetric finite beta effect. The three-dimensional MHD equilibrium...

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Published inPlasma science & technology Vol. 15; no. 2; pp. 115 - 118
Main Authors Bunno, M., Nakamura, Y., Suzuki, Y., Shinohara, K., Matsunaga, G., Tani, K.
Format Journal Article
LanguageEnglish
Published 01.02.2013
Subjects
Computational efficiency
Confinement
C代码
Flux
Mathematical analysis
MHD
Orbits
Ripples
Three dimensional
Tokamak devices
平衡计算
托卡马克等离子体
环向场线圈
纵场
纹波
非轴对称
高能离子
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Summary:The efficiency of energetic ion confinement is reduced in a tokamak plasma by the non-axisymmetric field, namely the ripple field. The ripple field is produced by a finite number of toroidal field coils. It is affected by the non-axisymmetric finite beta effect. The three-dimensional MHD equilibrium calculation code VMEC is used to analyze the non-axisymmetric finite beta effect in a ripple tokamak. In the VMEC code, the flux coordinates are used, so the calculation region is limited to the area of plasma. To calculate the orbit outside the plasma, we develop a field calculation code, which is based on the Biot-Savart law. The details of the method and results are described in this paper.
Bibliography:ripple, VMEC, ITER, alpha particle, F3D-OFMC
The efficiency of energetic ion confinement is reduced in a tokamak plasma by the non-axisymmetric field, namely the ripple field. The ripple field is produced by a finite number of toroidal field coils. It is affected by the non-axisymmetric finite beta effect. The three-dimensional MHD equilibrium calculation code VMEC is used to analyze the non-axisymmetric finite beta effect in a ripple tokamak. In the VMEC code, the flux coordinates are used, so the calculation region is limited to the area of plasma. To calculate the orbit outside the plasma, we develop a field calculation code, which is based on the Biot-Savart law. The details of the method and results are described in this paper.
34-1187/TL
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ISSN:1009-0630
DOI:10.1088/1009-0630/15/2/07