通过临界梯度优化减少准对称恒星器中的静电湍流

IF 2.1 3区 物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS
G.T. Roberg-Clark, P. Xanthopoulos, G.G. Plunk
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引用次数: 0

摘要

我们介绍了一种针对离子温度梯度(ITG)驱动模式开始时的大阈值("临界梯度")而优化的恒星器配置,它达到了我们在任何恒星器中所看到的最大临界梯度。在该临界梯度之上,陀螺动力学模拟显示,该配置在与实验相关的驱动强度范围内具有较低的湍流水平。所采用的优化方法旨在最大限度地提高漂移曲率,从而增强环形 ITG 模式的局部剪切稳定和相关湍流。这些优势与出色的准对称性相结合,产生了较低的新古典传输和极小的阿尔法粒子损耗。对由此产生的构型的分析表明,由于新构型具有真空磁山,因此需要在磁流体动力学(MHD)和 ITG 稳定性之间进行权衡。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Reduction of electrostatic turbulence in a quasi-helically symmetric stellarator via critical gradient optimization
We present a stellarator configuration optimized for a large threshold (‘critical gradient’) for the onset of the ion temperature gradient (ITG) driven mode, which achieves the largest critical gradient we have seen in any stellarator. Above this threshold, gyrokinetic simulations show that the configuration has low turbulence levels over an experimentally relevant range of the drive strength. The applied optimization seeks to maximize the drift curvature, leading to enhanced local-shear stabilization of toroidal ITG modes, and the associated turbulence. These benefits are combined with excellent quasi-symmetry, yielding low neoclassical transport and vanishingly small alpha particle losses. Analysis of the resulting configuration suggests a trade-off between magnetohydrodynamic (MHD) and ITG stability, as the new configuration possesses a vacuum magnetic hill.
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来源期刊
Journal of Plasma Physics
Journal of Plasma Physics 物理-物理:流体与等离子体
CiteScore
3.50
自引率
16.00%
发文量
106
审稿时长
6-12 weeks
期刊介绍: JPP aspires to be the intellectual home of those who think of plasma physics as a fundamental discipline. The journal focuses on publishing research on laboratory plasmas (including magnetically confined and inertial fusion plasmas), space physics and plasma astrophysics that takes advantage of the rapid ongoing progress in instrumentation and computing to advance fundamental understanding of multiscale plasma physics. The Journal welcomes submissions of analytical, numerical, observational and experimental work: both original research and tutorial- or review-style papers, as well as proposals for its Lecture Notes series.
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