A V Chankin, G Corrigan, A Huber, JET Contributors4
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At the same time, the variation of the toroidal field and safety factor in deuterium cases yielded no correlation between the model predictions and code results. The code showed much higher local impurity fractions (<italic toggle=\"yes\">f<sub>Z</sub>\n</italic>) in the divertor compared to the main SOL, as well as large case-to-case variations in the divertor to the main SOL ratio of impurity fractions. The analysis of code results has wide-ranging consequences not only for the HC model, but also for other similar 1D models which use simple geometry ignoring strong neutral recycling in the divertor/ Different topology makes plasma parameters in the divertor and main SOL very different, resulting in different impurity charge state composition. Missing mechanisms in 1D codes (e.g. friction and thermo-forces exerted on impurity ions by main working gas ions) lead to impurity density redistribution. 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引用次数: 0
摘要
对注入氮气的高辐射等离子体进行了一系列 EDGE2D-EIRENE("代码")运行,对上游杂质分数的休伯-钱金(HC)比例预测进行了验证。从代码中提取的主要数量是从 X 点到 X 点的极平均值,即主刮除层(SOL)中的分离基质杂质分数 cZ。主要工作气体(H、D 和 T)的变化表明,由于 HC 模型中假设并在代码中实施的 H 模式功率阈值的反同位素质量依赖性,导致预测的 cZ 值存在很大的同位素差异,因此模型和代码结果在质量上是一致的。同时,氘情况下环形场和安全系数的变化导致模型预测和代码结果之间没有关联。代码显示,与主 SOL 相比,岔流器中的局部杂质分数(fZ)要高得多,而且岔流器与主 SOL 的杂质分数比在不同情况下变化很大。对代码结果的分析不仅对 HC 模型有广泛的影响,而且对其他类似的一维模型也有影响,因为这些模型使用简单的几何结构,忽略了岔流器中的强中性循环。1D 代码中缺失的机制(如主工作气体离子对杂质离子施加的摩擦力和热力)导致杂质密度重新分布。忽略上述所有因素,1D 模型假定沿场线的杂质分数恒定不变。
Testing validity of 1D models for impurity fraction scaling for divertor detachment with EDGE2D-EIRENE
Predictions of the Huber–Chankin (HC) scaling for the upstream impurity fraction were verified in a series of EDGE2D-EIRENE (‘code’) runs for highly radiating plasmas with nitrogen injection. The main quantity extracted from the code was poloidally averaged, from X-point to X-point, separatrix impurity fraction cZ in the main scrape-off layer (SOL). Variation of the main working gas (H, D and T) revealed a qualitative agreement between the model and code results owing to the very large isotope difference in the predicted cZ values caused primarily by the inverse isotope mass dependence of the H-mode power threshold assumed in the HC model and implemented in the code. At the same time, the variation of the toroidal field and safety factor in deuterium cases yielded no correlation between the model predictions and code results. The code showed much higher local impurity fractions (fZ) in the divertor compared to the main SOL, as well as large case-to-case variations in the divertor to the main SOL ratio of impurity fractions. The analysis of code results has wide-ranging consequences not only for the HC model, but also for other similar 1D models which use simple geometry ignoring strong neutral recycling in the divertor/ Different topology makes plasma parameters in the divertor and main SOL very different, resulting in different impurity charge state composition. Missing mechanisms in 1D codes (e.g. friction and thermo-forces exerted on impurity ions by main working gas ions) lead to impurity density redistribution. Neglecting all above factors, 1D models assume a constant impurity fraction along field lines.
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.