Simulations of tokamak edge plasma turbulent fluctuations based on a minimal 3D model

IF 2.1 2区物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS

Plasma Physics and Controlled Fusion Pub Date : 2024-03-01 DOI:10.1088/1361-6587/ad2b91

M V Umansky, B I Cohen, I Joseph

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引用次数: 0

Abstract

A new simulation model for tokamak boundary plasma, SOLT3D, is implemented in the BOUT++ framework (Dudson et al 2009 Comput. Phys. Commun. 180 1467). The simulation model includes a set of dynamic equations describing collisional boundary plasma and neutral gas in the tokamak scrape-off layer and divertor region. The model is verified against standard linear plasma instabilities and available nonlinear results. For L-mode like conditions, SOLT3D reproduces characteristics of boundary plasma turbulent fluctuations that are similar to published experimental data, in terms of the amplitude and spatial dependence of the fluctuations. It also reproduces realistic plasma fluxes on material surfaces and expected Bohm-like effective radial transport. Plasma fluctuations inferred from the simulations imply inevitably a significant level of intrinsic ‘noise’ for axisymmetric tokamak plasma transport modeling, introducing errors on the order of unity. In particular, the toroidally averaged atomic rates below 5–10 eV are strongly modified by turbulent plasma fluctuations, which should significantly affect the standard axisymmetric modeling of the tokamak edge plasma and divertor.

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基于最小三维模型的托卡马克边缘等离子体湍流波动模拟

托卡马克边界等离子体的新模拟模型 SOLT3D 是在 BOUT++ 框架中实现的（Dudson 等人，2009 年，Comput.）该模拟模型包括一组动态方程，描述了碰撞边界等离子体以及托卡马克刮除层和分流器区域的中性气体。该模型根据标准线性等离子体不稳定性和现有非线性结果进行了验证。在类似 L 模式的条件下，SOLT3D 重现了边界等离子体湍流波动的特征，在波动的幅度和空间依赖性方面与已公布的实验数据相似。它还再现了材料表面上真实的等离子通量和预期的类似玻姆的有效径向传输。从模拟中推断出的等离子体波动意味着轴对称托卡马克等离子体输运建模不可避免地会有很大程度的内在 "噪声"，会带来单位数量级的误差。特别是，5-10 eV 以下的环状平均原子速率受到湍流等离子体波动的强烈影响，这将对托卡马克边缘等离子体和分流器的标准轴对称建模产生重大影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Plasma Physics and Controlled Fusion 物理-物理：核物理

CiteScore

4.50

自引率

13.60%

发文量

224

审稿时长

4.5 months

期刊介绍： Plasma Physics and Controlled Fusion covers all aspects of the physics of hot, highly ionised plasmas. This includes results of current experimental and theoretical research on all aspects of the physics of high-temperature plasmas and of controlled nuclear fusion, including the basic phenomena in highly-ionised gases in the laboratory, in the ionosphere and in space, in magnetic-confinement and inertial-confinement fusion as well as related diagnostic methods. Papers with a technological emphasis, for example in such topics as plasma control, fusion technology and diagnostics, are welcomed when the plasma physics is an integral part of the paper or when the technology is unique to plasma applications or new to the field of plasma physics. Papers on dusty plasma physics are welcome when there is a clear relevance to fusion.