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arXiv 2209.07830physics.plasm-ph
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EU-DEMO备选偏滤器模拟中功率消耗的参数标度

Parametric scaling of power exhaust in EU-DEMO alternative divertor simulations

A. E. Järvinen, L. Aho-Mantila, T. Lunt, F. Subba, G. Rubino, L. Xiang

摘要:

在EU-DEMO的备选偏滤器构型(ADC)SOLPS-ITER模拟数据库中进行功率排气参数标度的研究,并与基于Lengyel模型的预测进行比较。Lengyel模型高估了LFS偏滤器分离所需的氩浓度,相对于SOLPS-ITER模拟,高估了约5-10倍。因此,虽然Lengyel模型预测在EU-DEMO中具有可加速偏滤器热负荷的等离子体将大大超过可容忍的上游杂质浓度,但在可接受的操作空间内有几种SOLPS-ITER解决方案。SOLPS-ITER模拟表明,与标准Lengyel模型所假设的不同,除了氩辐射之外,还有显著的散热机制,例如交叉场传输,将氩辐射的作用降低了2至3倍。此外,Lengyel模型假设辐射阵面仅由平行热传导提供动力,这往往导致窄辐射阵面,因为辐射效率随着热导率的降低而强烈增加。结果,对于给定的杂质浓度,辐射体积和总杂质辐射被抑制。然而,SOLPS-ITER模拟表明,其他机制,如交叉场传输,可以与辐射前沿内的平行热传导竞争,并增加辐射体积。由于这些发现,强烈建议不要使用标准Lengyel模型来分析偏滤器条件与EU-DEMO等装置配置之间的比例关系。

英文摘要:

Investigations of parametric scaling of power exhaust in the alternative divertor configuration (ADC) SOLPS-ITER simulation database of the EU-DEMO are conducted and compared to predictions based on the Lengyel model. The Lengyel model overpredicts the necessary argon concentrations for LFS divertor detachment by about a factor of 5-10 relative to the SOLPS-ITER simulations. Therefore, while the Lengyel model predicts that plasmas with accetable divertor heat loads in EU-DEMO would exceed the tolerable upstream impurity concentrations by a large margin, there are several SOLPS-ITER solutions within an acceptable operational space. The SOLPS-ITER simulations indicate that, unlike assumed by the standard Lengyel model, there are significant heat dissipation mechanisms other than argon radiation, such as cross-field transport, that reduce the role of argon radiation by a factor of 2 to 3. Furthermore, the Lengyel model assumes that the radiation front is powered by parallel heat conduction only, which tends to lead to a narrow radiation front as the radiative efficiency increases strongly with reducing thermal conductivity. As a result, the radiative volume and total impurity radiation are suppressed for a given impurity concentration. However, the SOLPS-ITER simulations indicate that other mechanisms, such as cross-field transport, can compete with parallel heat conduction within the radiative front and increase the radiative volume. Due to these findings, usage of the standard Lengyel model for analyzing scaling between divertor conditions and configurations for devices such as EU-DEMO is strongly discouraged.

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