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arXiv 1909.07417math.NAcs.NAphysics.comp-phphysics.plasm-ph
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磁聚变中的高效高阶奇异quadrature格式

Efficient high-order singular quadrature schemes in magnetic fusion

Dhairya Malhotra, Antoine J. Cerfon, Michael O'Neil, Evan Toler

摘要:

磁约束聚变中的一些问题,如外部真空场的计算或总磁场分解为等离子体和外部源的单独贡献,最好用积分方程表达式来表述。基于Biot-Savart公式,这些积分包含奇异被积函数。通常用于解决沿一般环形表面的各种奇异表面积分的计算的正则化方法是低阶精确的,因此需要密集的计算网格以获得足够的精度。在这项工作中,我们提出了一个快速,高阶求积计划,这些积分的有效计算。数值算例表明了该方法的计算效率和高阶精度收敛性。已公开发布了相应的代码供社区使用。

英文摘要:

Several problems in magnetically confined fusion, such as the computation of exterior vacuum fields or the decomposition of the total magnetic field into separate contributions from the plasma and the external sources, are best formulated in terms of integral equation expressions. Based on Biot-Savart-like formulae, these integrals contain singular integrands. The regularization method commonly used to address the computation of various singular surface integrals along general toroidal surfaces is low-order accurate, and therefore requires a dense computational mesh in order to obtain sufficient accuracy. In this work, we present a fast, high-order quadrature scheme for the efficient computation of these integrals. Several numerical examples are provided demonstrating the computational efficiency and the high-order accurate convergence. A corresponding code for use in the community has been publicly released.

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