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Influence of pressure-gradient and shear on ballooning stability in stellarators

机译:压力梯度和剪切力对恒星球囊膨胀稳定性的影响

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摘要

Pressure driven, ideal ballooning stability calculations are often used to predict the achievable plasma β in stellarator configurations. In this paper, the sensitivity of ballooning stability to plasmas profile variations is addressed. A simple, semi-analytic method for expressing the ballooning growth rate, for each field line, as a polynomial function of the variations in the pressure-gradient and the average magnetic shear from an original equilibrium has recently been introduced (Hudson and Hegna 2004 Phys. Plasmas 11 L53). This paper will apply the expression to various stellarator configurations and comment on the validity of various truncated forms of the polynomial expression. In particular, it is shown that it is generally insufficient to consider only the second order terms as previously assumed, and that higher order terms must be included to obtain accurate predictions of stability.
机译:压力驱动的理想球囊稳定性计算通常用于预测恒星器配置中可达到的血浆β。在本文中,解决了膨胀稳定性对血浆分布变化的敏感性。最近引入了一种简单的半解析方法,用于表达每个场线的膨胀速度,作为压力梯度和原始平衡的平均磁剪变的多项式函数(Hudson和Hegna,2004年,物理等离子11 L53)。本文将将该表达式应用于各种恒星器配置,并评论了多项式表达式的各种截断形式的有效性。特别地,示出了通常仅考虑先前假设的二阶项是不够的,并且必须包括更高阶的项以获得稳定性的准确预测。

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