捕获电子的可用能量:湍流输运的非线性测量

IF 2.1 3区 物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS
R.J.J. Mackenbach, J.H.E. Proll, R. Wakelkamp, P. Helander
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引用次数: 3

摘要

一个无碰撞的等离子体拥有一定量的“可用能量”,这部分热能可以转化为等离子体运动和电磁波动的动能。本文给出了在细长非均匀等离子体通量管中捕获电子所携带的可用能量的计算方法。这一数值与在不同的仿星器和托卡马克中由无碰撞捕获电子模式驱动的非线性饱和径向能量流的陀螺动力学模拟结果进行了比较。有效能量的数值计算速度很快,并且与陀螺动力学模拟中发现的湍流能量通量有很强的相关性。事实上,能量通量被发现与可用能量成正比,大约是3/2美元的幂,这是人们从一个简单的论点中所期望的。我们进一步研究了可用能量如何分布在不同的弹跳井中,发现深度捕获的电子通常对可用能量贡献最大。最后,我们研究了可用能量对梯度强度的依赖性,并发现了仿星器和托卡马克的弱驱动和强驱动机制之间的重要差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The available energy of trapped electrons: a nonlinear measure for turbulent transport
A collisionless plasma possesses a certain amount of ‘available energy’, which is that part of the thermal energy that can be converted into kinetic energy of plasma motion and electromagnetic fluctuations. In this paper we present a calculation of the available energy carried by trapped electrons in a slender non-omnigenous flux tube of plasma. This quantity is compared with gyrokinetic simulations of the nonlinear saturated radial energy flux resulting from turbulence driven by collisionless trapped-electron modes in various stellarators and a tokamak. The numerical calculation of available energy is fast and shows a strong correlation with the turbulent energy fluxes found in the gyrokinetic simulations. Indeed, the energy flux is found to be proportional to the available energy to the power of approximately $3/2$ , which is what one would expect from a simple argument. We furthermore investigate how available energy is distributed across different bounce wells, and it is found that deeply trapped electrons typically contribute most to the available energy. Finally, we investigate the dependence of available energy on gradient strength, and we find important differences between weakly and strongly driven regimes for stellarators and tokamaks.
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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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