Tokamak resistive magnetohydrodynamic ballooning instability in the negative shear regime |
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Authors: | Shi Bing-Ren Lin Jian-Long and Li Ji-Quan |
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Institution: | 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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