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arXiv 2408.07299physics.plasm-ph
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关于引导中心问题的李变换微扰方法的奇异性研究

On the singularity of Lie-transform perturbation approach to the guiding-center problem

W. H. Lin, J. Garcia, J. Q. Li

AI总结:

针对引导中心李变换微扰中生成向量确定方程的固有奇异性难题,提出交错确定生成向量的新方案,通过回旋角显式积分自然得到规范函数,无高阶误差,并推导了含强ExB剪切与电磁涨落效应的统一引导中心变换形式体系。

摘要:

我们提出了一种对引导中心运动开展李变换微扰的新方案,旨在直接解决生成向量的确定方程中固有存在的奇异性问题——该奇异性会在李变换的纯振荡部分中产生难以处理的规范函数。在大多数李变换微扰的应用中,这类规范函数必须通过一些偏微分方程近似求解,而我们的方案以交错确定生成向量为特征,通过对回旋角的显式积分自然得到规范函数,在所有后续变换中都不会留下无法解释的高阶误差。基于该方案,我们以统一的方式推导了引导中心变换的形式体系,同时保留了强ExB剪切以及电磁涨落的效应。

英文摘要:

We present a novel scheme of carrying out the Lie-transform perturbation for the guiding-center motion, with an aim at addressing directly the problem of singularity which exists intrinsically in the determining equation for the generating vector, and which gives rise to the formidable gauge functions in the pure oscillating part of the Lie transformation. Whereas in most applications of Lie-transform perturbation such gauge functions must be approximately solved from some partial differential equations, our scheme, characterized by a staggered determination of the generating vectors, naturally produces the gauge functions through explicit integral over the gyro-angle, leaving no unaccountable error of high order in all the succeeding transformations. Based on such scheme, a formalism of guiding-center transformation has been derived in a unified manner retaining the effects of the strong ExB shearing as well as those of electromagnetic fluctuations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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