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arXiv 1102.2508physics.plasm-ph
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仿星器新经典计算中的单能近似

The monoenergetic approximation in stellarator neoclassical calculations

Matt Landreman

摘要:

在仿星器新古典输运数值计算的标准“单能”方法中,为了加快计算速度,对动力学方程进行了临时更改,因此速度仅作为参数输入。在这里,我们检查这种方法的有效性,考虑在一个模型磁场的有效粒子轨迹。我们发现单能代码系统下预测的真实捕获粒子分数,与错误的捕获离子分数的顺序统一时,电场是大的,这表明这些代码的一些结果可能是不可靠的,在这个政权。这种不准确性与碰撞算子近似所引入的任何误差无关。

英文摘要:

In the standard "monoenergetic" approach to numerical calculation of stellarator neoclassical transport, to expedite computation, ad-hoc changes are made to the kinetic equation so speed enters only as a parameter. Here we examine the validity of this approach by considering the effective particle trajectories in a model magnetic field. We find monoenergetic codes systematically under-predict the true trapped particle fraction, with the error in the trapped ion fraction being of order unity when the electric field is large, suggesting some results of these codes may be unreliable in this regime. This inaccuracy is independent of any errors introduced by approximation of the collision operator.

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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