论文标题
通过湍流预防恒星中的核心颗粒耗竭
Prevention of core particle depletion in stellarators by turbulence
论文作者
论文摘要
在与反应器相关的等离子体中，新古典传输驱动大型恒星核心的外部粒子通量，并预测强大的空心密度曲线。但是，这一理论预测与实验相矛盾。特别是，在Wendelstein 7-X中，通常测量了第一个大型优化的恒星，平坦或弱峰密度曲线，表明新古典理论不够，并且对粒子通量的内在贡献在核心中缺少。在这封研究信中，结果表明，湍流的湍流贡献可以解释实验测量和新古典预测之间的差异。这本研究信的结果还证明，理论和数值工具正在接近预测恒星等离子体中平衡密度谱所需的成熟度，这是当前设备和未来反应器的操作场景设计的基本要求。
In reactor-relevant plasmas, neoclassical transport drives an outward particle flux in the core of large stellarators and predicts strongly hollow density profiles. However, this theoretical prediction is contradicted by experiments. In particular, in Wendelstein 7-X, the first large optimized stellarator, flat or weakly peaked density profiles are generally measured, indicating that neoclassical theory is not sufficient and that an inward contribution to the particle flux is missing in the core. In this Research Letter, it is shown that the turbulent contribution to the particle flux can explain the difference between experimental measurements and neoclassical predictions. The results of this Research Letter also prove that theoretical and numerical tools are approaching the level of maturity needed for the prediction of equilibrium density profiles in stellarator plasmas, which is a fundamental requirement for the design of operation scenarios of present devices and future reactors.
