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Designing stellarator coils by a modified Newton method using FOCUS

机译:使用焦点的改进的牛顿方法设计螺旋液线圈

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摘要

To find the optimal coils for stellarators, nonlinear optimization algorithms are applied in existing coil design codes. However, none of these codes have used the information from the second-order derivatives. In this paper, we present a modified Newton method in the recently developed code FOCUS. The Hessian matrix is calculated with analytically derived equations. Its inverse is approximated by a modified Cholesky factorization and applied in the iterative scheme of a classical Newton method. Using this method, FOCUS is able to recover the W7-X modular coils starting from a simple initial guess. Results demonstrate significant advantages.
机译:为了找到螺旋桨的最佳线圈,在现有线圈设计代码中应用非线性优化算法。 但是,这些代码都没有使用来自二阶导数的信息。 在本文中,我们在最近开发的代码焦点中提出了一种改进的牛顿方法。 Hessian矩阵用分析衍生的方程计算。 它的逆近似由修改的弦孔的分解和应用于经典牛顿方法的迭代方案。 使用此方法,焦点能够从简单的初始猜测开始恢复W7-X模块化线圈。 结果表明了显着的优势。

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