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Tokamak resistive magnetohydrodynamic ballooning instability in the negative shear regime

Tokamak resistive magnetohydrodynamic ballooning instability in the negative shear regime
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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. 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.
出处 《Chinese Physics B》 SCIE EI CAS CSCD 2007年第5期1399-1404,共6页 中国物理B(英文版)
基金 Project supported by the National Natural Science Foundation of China (Grant Nos 10375018 and 10575032).
关键词 negative shear resistive ballooning instability negative shear, resistive ballooning instability
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参考文献15

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