Global Gyrokinetic Simulations of Isotope Effects under Ambipolar Electric Fields and Advances Toward Whole-Volume Modeling

IF 2.3 4区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Journal of Fusion Energy Pub Date : 2025-12-01 DOI:10.1007/s10894-025-00529-9

Toseo Moritaka, Robert Hager, Hideo Sugama, Shinsuke Satake, Seikichi Matsuoka, Seung-Hoe Ku, C-S. Chang, Seiji Ishiguro

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Abstract

We review global gyrokinetic simulation studies on plasma transport in the Large Helical Device using XGC-S. XGC-S is an extended version of X-point Gyrokinetic Code for stellarators and has been progressively verified throughout the code development process. Verification tests of neoclassical transport successfully demonstrate the generation of an ambipolar electric field due to ripple-trapped particles. We perform quasi-linear analyses of the ion temperature gradient mode under the influence of the ambipolar electric field. The results reveal that the ambipolar electric field and the heavy hydrogen component in mixed isotope plasmas can lead to the favorable isotope effect observed in recent deuterium experiments. We also present recent efforts in code development toward whole-volume simulations, including the helical divertor region. A mesh generation scheme based on field-line tracing and the construction of curved surfaces perpendicular to the magnetic field would be promising for global field calculations in the whole-volume simulations.

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双极电场下同位素效应的全球陀螺动力学模拟及全体积模拟研究进展

本文综述了利用XGC-S对等离子体在大螺旋装置中的输运进行的整体回旋动力学模拟研究。XGC-S是仿星器x点陀螺动力学代码的扩展版本，并在整个代码开发过程中逐步得到验证。新古典输运的验证试验成功地证明了由波纹捕获粒子产生的双极电场。本文对双极电场作用下离子温度梯度模式进行了拟线性分析。结果表明，混合同位素等离子体中的双极电场和重氢成分是导致氘实验中观测到的良好同位素效应的原因。我们还介绍了最近在全体积模拟方面的代码开发工作，包括螺旋分流器区域。基于磁场线跟踪和垂直于磁场的曲面构造的网格生成方案将有望实现全体积模拟中的全局磁场计算。

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来源期刊

Journal of Fusion Energy 工程技术-核科学技术

CiteScore

2.20

自引率

0.00%

发文量

审稿时长

2.3 months

期刊介绍： The Journal of Fusion Energy features original research contributions and review papers examining and the development and enhancing the knowledge base of thermonuclear fusion as a potential power source. It is designed to serve as a journal of record for the publication of original research results in fundamental and applied physics, applied science and technological development. The journal publishes qualified papers based on peer reviews. This journal also provides a forum for discussing broader policies and strategies that have played, and will continue to play, a crucial role in fusion programs. In keeping with this theme, readers will find articles covering an array of important matters concerning strategy and program direction.