| Tokamak resistive magnetohydrodynamic ballooning instability in the negative shear regime |
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| 作者姓名： | 石秉仁 林建龙 李继全 |
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| 作者单位： | Southwestern Institute of Physics, Chengdu 610041,
China;Southwestern Institute of Physics, Chengdu 610041,
China;Southwestern Institute of Physics, Chengdu 610041,
China |
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| 基金项目： | Project supported by the National
Natural Science Foundation of China (Grant Nos 10375018 and
10575032). |
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| 摘 要： | Improved confinement of tokamak plasma with central negative shear is checked against the resistive ballooning mode. In the negative shear regime, the plasma is always unstable for purely growing resistive ballooning mode. For a simplest tokamak equilibrium model, the s-α model, characteristics of this kind of instability are fully clarified by numerically solving the high n resistive magnetohydrodynamic ballooning eigen-equation. Dependences of the growth rate on the resistivity, the absolute shear value, the pressure gradient are scanned in detail. It is found that the growth rate is a monotonically increasing function of a while it is not sensitive to the changes of the shear s, the initial phase θ0 and the resistivity parameter εR.
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| 关 键 词： | 托卡马克装置 磁流体动力学 电阻气球波模不稳定性 负切变制 |
| 收稿时间： | 2006-07-28 |
| 修稿时间： | 2006-07-282006-11-30 |
Tokamak resistive magnetohydrodynamic ballooning instability in the negative shear regime |
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| Shi Bing-Ren,Lin Jian-Long and Li Ji-Quan.Tokamak resistive magnetohydrodynamic ballooning instability in the negative shear regime[J].Chinese Physics B,2007,16(5):1399-1404. |
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| Authors: | Shi Bing-Ren Lin Jian-Long and Li Ji-Quan |
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| Affiliation: | Southwestern Institute of Physics, Chengdu 610041, China |
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| Abstract: | Improved confinement of tokamak plasma with central negative shear
is checked against the resistive ballooning mode. In the negative
shear regime, the plasma is always unstable for purely growing
resistive ballooning mode. For a simplest tokamak equilibrium model,
the s--α model, characteristics of this kind of instability
are fully clarified by numerically solving the high n resistive
magnetohydrodynamic ballooning eigen-equation. Dependences of the
growth rate on the resistivity, the absolute shear value, the
pressure gradient are scanned in detail. It is found that the growth
rate is a monotonically increasing function of α while it is not
sensitive to the changes of the shear s, the initial phase \ta0
and the resistivity parameter \vaR. |
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| Keywords: | negative shear resistive
ballooning instability |
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