Lyman line opacities in tokamak divertor plasmas under high-recycling and detached conditions

IF 2.3 2区物理与天体物理 Q1 NUCLEAR SCIENCE & TECHNOLOGY Nuclear Materials and Energy Pub Date : 2024-11-06 DOI:10.1016/j.nme.2024.101794

Ray Chandra , Detlev Reiter , Niels Horsten , Mathias Groth

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引用次数: 0

Abstract

Radiation transport simulations of the deuterium Lyman line series using EIRENE predict a factor of 2 increase of Balmer-

α

emission in the JET-ILW low confinement divertor plasmas in high-recycling and detached conditions caused by the re-absorption of Lyman-

β

emission. The photon tracing model in the EIRENE code is applied to SOLPS-ITER pure deuterium plasma solutions of JET-ILW to evaluate the contribution of Lyman-

β

capture towards the population density of D(

p = 3

) and, consequently, the Balmer-

α

emission. The local population escape factors of Lyman-

α

and Lyman-

β

lines in the JET-ILW divertor show steep spatial gradients and indicate local regions with high opacity in high-recycling and detached conditions. The relative contribution of Lyman-

β

capture towards the population density of D(

p = 3

) is significant in high-recycling and detached conditions. This observation is further corroborated by line-integrated calculations using Balmer-

α

diagnostic line-of-sights.

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高循环和分离条件下托卡马克分流器等离子体中的莱曼线不透明性

利用 EIRENE 对氘莱曼线系列进行的辐射传输模拟预测，在高循环和分离条件下，JET-ILW 低约束分流器等离子体中的 Balmer-α 发射将增加 2 倍，这是由于莱曼-β 发射的再吸收造成的。将 EIRENE 代码中的光子追踪模型应用于 JET-ILW 的 SOLPS-ITER 纯氘等离子体溶液，以评估莱曼-β 捕获对 D(p=3) 种群密度的贡献，以及因此对巴尔默-α 发射的贡献。在 JET-ILW 分流器中，Lyman-α 和 Lyman-β 线的局域群逸散因子显示出陡峭的空间梯度，表明在高循环和分离条件下，局域具有高不透明度。在高循环和分离条件下，Lyman-β俘获对D(p=3)群密度的相对贡献很大。利用巴尔默-α诊断视线进行的线积分计算进一步证实了这一观测结果。

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来源期刊

Nuclear Materials and Energy Materials Science-Materials Science (miscellaneous)

CiteScore

3.70

自引率

15.40%

发文量

175

审稿时长

20 weeks

期刊介绍： The open-access journal Nuclear Materials and Energy is devoted to the growing field of research for material application in the production of nuclear energy. Nuclear Materials and Energy publishes original research articles of up to 6 pages in length.