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On plasma edge ideal MHD stability/instability condition in Mercier stable magnetic hill configurations

机译:梅克里稳定磁山配置的等离子体边缘理想MHD稳定性/不稳定条件

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The stability of peeling modes in zero net current stellarator plasma is studied in high poloidal mode number m 1 approximation. The vacuum region solution is taken into account. Under these conditions in Mercier stable magnetic hill plasmas internal peeling modes are stable. External peeling modes can be unstable, but several limitations on them are found. It is shown that an analytically derived pressure gradient threshold is in reasonable agreement with the experimental observations and numerical calculations. The threshold decreases with increasing poloidal mode number m. It is shown, however, that higher modes may be stabilized due to finite ion Larmor radius effects. For the sake of definiteness, we have investigated peeling mode behavior in Mercier unstable plasma. It is shown that both external and internal peeling modes can be unstable in this regime. However, external and internal peeling modes in this case are definitely different.
机译:在高端数M 1近似下研究了零净流动渗流器等离子体中剥离模式的稳定性。 真空区域溶液考虑。 在这些条件下,Mercier稳定的磁山等离子体内部剥离模式稳定。 外部剥离模式可能是不稳定的,但找到了几个限制。 结果表明,分析衍生的压力梯度阈值与实验观察和数值计算合理一致。 阈值随着单极模式数量的增加而降低。 然而,如图所示,可以稳定较高的模式,因为有限的离子传染率半径效应。 为了肯定,我们在Mercier不稳定等离子体中调查了剥离模式行为。 结果表明,外部和内部剥离模式在该方案中可能不稳定。 然而,这种情况下的外部和内部剥离模式肯定是不同的。

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