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arXiv 2406.04147physics.plasm-ph
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仿星器反应堆中新经典离子输运的直接优化

Direct optimization of neoclassical ion transport in stellarator reactors

B. F. Lee, S. A. Lazerson, H. M. Smith, C. D. Beidler, N. A. Pablant

AI总结:

本文通过直接优化仿星器新经典离子输运并适度保持电子输运,提高热输运系数比以形成指向外部的径向电场,从而在保持离子约束的同时促进杂质排出。

摘要:

我们直接优化仿星器的新经典离子输运,同时将新经典电子输运保持在中等水平,从而创造出有利于杂质排出并保持良好离子约束的方案。传统的新经典仿星器优化一直专注于最小化 $ε_\mathrm{eff}$,即表征处于 $1/ν$ 区域的粒子所产生径向输运量的几何因子。在预期与反应堆相关的条件下,芯部电子将处于 $1/ν$ 区域,而芯部燃料离子将处于 $\sqrtν$ 区域。因此,传统优化方法最小化电子输运,并依赖形成的径向电场 $\left(E_r\right)$ 来约束离子。这通常会导致 $E_r$ 指向内部,从而将高 $Z$ 杂质驱入芯部,这在未来反应堆中可能造成问题。在本工作中,我们提高了热输运系数之比 $L_{1 1}^{e}/L_{1 1}^{i}$,此前的研究表明,这可以产生指向外部的 $E_r$。这一效应非常有利于杂质排出。我们在与反应堆相关的条件下,针对一个优化后的平衡位形,获得了自洽的密度、温度和 $E_r$ 剖面。该平衡位形预计将显著改善杂质输运特性。

英文摘要:

We directly optimize stellarator neoclassical ion transport while holding neoclassical electron transport at a moderate level, creating a scenario favorable for impurity expulsion and retaining good ion confinement. Traditional neoclassical stellarator optimization has focused on minimizing $ε_\mathrm{eff}$, the geometric factor that characterizes the amount of radial transport due to particles in the $1/ν$ regime. Under expected reactor-relevant conditions, core electrons will be in the $1/ν$ regime and core fuel ions will be in the $\sqrtν$ regime. Traditional optimizations thus minimize electron transport and rely on the radial electric field $\left(E_r\right)$ that develops to confine the ions. This often results in an inward-pointing $E_r$ that drives high-$Z$ impurities into the core, which may be troublesome in future reactors. In this work, we increase the ratio of the thermal transport coefficients $L_{1 1}^{e}/L_{1 1}^{i}$, which previous research has shown can create an outward-pointing $E_r$. This effect is very beneficial for impurity expulsion. We obtain self-consistent density, temperature, and $E_r$ profiles at reactor-relevant conditions for an optimized equilibrium. This equilibrium is expected to enjoy significantly improved impurity transport properties.

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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