Heavy impurity confinement in hybrid operation scenario plasmas with a rotating 1/1 continuous mode
Heavy impurity confinement in hybrid operation scenario plasmas with a rotating 1/1 continuous mode
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具有旋转 1/1 连续模式的混合操作场景等离子体中的重杂质限制
DOI：
10.1088/1361-6587/aa896f
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发表时间：
2017
影响因子：
2.2
通讯作者：
D. Pfefferlé
中科院分区：
文献类型：
--
作者：
M. Raghunathan;J. Graves;T. Nicolas;W. A. Cooper;X. Garbet;D. Pfefferlé
在像具有钨壁的 ITER 这样的未来托卡马克装置中，必须控制运行等离子体核心中的钨积累，特别是因为钨的积累会导致辐射塌陷和破坏。我们研究了在存在强等离子体旋转的情况下，具有轴对称和饱和 1/1 理想螺旋核心的类 JET 混合场景中钨微量杂质的行为。为此，我们从 VMEC 获得平衡，并使用 VENUS-LEVIS（引导中心轨道跟踪代码）来跟踪重杂质粒子。在这项工作中，VENUS-LEVIS 已被修改以解释强等离子体流以及由此类流产生的相关新古典效应。我们发现，与轴对称相比，螺旋核心和等离子体旋转的组合增强了标准的新古典向内收缩，并且导致杂质朝向磁轴的强烈向内收缩，尽管离心力提供了强烈的向外扩散，正如实验中经常观察到的那样。
In future tokamaks like ITER with tungsten walls, it is imperative to control tungsten accumulation in the core of operational plasmas, especially since tungsten accumulation can lead to radiative collapse and disruption. We investigate the behavior of tungsten trace impurities in a JET-like hybrid scenario with both axisymmetric and saturated 1/1 ideal helical core in the presence of strong plasma rotation. For this purpose, we obtain the equilibria from VMEC and use VENUS-LEVIS, a guiding-center orbit-following code, to follow heavy impurity particles. In this work, VENUS-LEVIS has been modified to account for strong plasma flows with associated neoclassical effects arising from such flows. We find that the combination of helical core and plasma rotation augments the standard neoclassical inward pinch compared to axisymmetry, and leads to a strong inward pinch of impurities towards the magnetic axis despite the strong outward diffusion provided by the centrifugal force, as frequently observed in experiments.
LHD 中高 β 实验的结果
DOI：
--
发表时间：
2007
期刊：
影响因子：
--
作者：
榊原悟;渡邊清政;山田弘司;鈴木康浩;大館暁;舟場久芳;成嶋吉朗;東井和夫;田中謙治;徳沢季彦;山田一博;成原一途;居田克己;小森彰夫;榊原 悟;榊原悟
通讯作者：
榊原悟