利用 FIDASIM 对 W7-X 中的主动和被动快速离子 H-α 发射进行实验表征

IF 3.5 1区物理与天体物理 Q1 PHYSICS, FLUIDS & PLASMAS

Nuclear Fusion Pub Date : 2023-12-22 DOI:10.1088/1741-4326/ad0dd4

Peter Zs. Poloskei, B. Geiger, A. Jansen van Vuuren, S. Äkäslompolo, O.P. Ford, A. Spanier, T.W.C. Neelis, P. McNeely, D. Hartmann, the W7-X Teama

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引用次数: 0

摘要

本文介绍了对温德斯坦 7-X 的巴尔默-阿尔法光谱的首次分析结果，该光谱包含来自快离子的宽电荷交换发射。测量光谱与 FIDASIM 代码预测的合成光谱进行了比较，FIDASIM 代码提供了来自 VMEC 的三维磁场、来自 ASCOT 的五维快离子分布函数以及包括束粒子阻挡元素在内的现实中性束注入几何图形。光束发射的详细建模表明，测量到的光束发射光谱与预测值之间存在极好的一致性。相比之下，光束晕辐射和快离子 H-阿尔法信号（FIDA）的建模则由于强大的被动贡献而更具挑战性。大约 50%的光晕辐射可以归因于边缘中性的被动信号，而快离子 H-Alpha 辐射--尤其是边缘定位的瞄准线--则主要是被动辐射。部分原因是等离子体边缘的中性密度较高，部分原因是边缘产生的快速离子群，这一点已通过对边缘快速离子分布的详细建模得到证实。

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Experimental characterization of the active and passive fast-ion H-alpha emission in W7-X using FIDASIM

This paper presents the first results from the analysis of Balmer-alpha spectra at Wendelstein 7-X which contain the broad charge exchange emission from fast-ions. The measured spectra are compared to synthetic spectra predicted by the FIDASIM code, which has been supplied with the 3D magnetic fields from VMEC, 5D fast-ion distribution functions from ASCOT, and a realistic Neutral Beam Injection geometry including beam particle blocking elements. Detailed modeling of the beam emission shows excellent agreement between measured beam emission spectra and predictions. In contrast, modeling of beam halo radiation and Fast-Ion H-Alpha signals (FIDA) is more challenging due to strong passive contributions. While about 50% of the halo radiation can be attributed to passive signals from edge neutrals, the FIDA emission—in particular for an edge-localized line of sights—is dominated by passive emission. This is in part explained by high neutral densities in the plasma edge and in part by edge-born fast-ion populations as demonstrated by detailed modeling of the edge fast-ion distribution.

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来源期刊

Nuclear Fusion 物理-物理：核物理

CiteScore

6.30

自引率

39.40%

发文量

411

审稿时长

2.6 months

期刊介绍： Nuclear Fusion publishes articles making significant advances to the field of controlled thermonuclear fusion. The journal scope includes: -the production, heating and confinement of high temperature plasmas; -the physical properties of such plasmas; -the experimental or theoretical methods of exploring or explaining them; -fusion reactor physics; -reactor concepts; and -fusion technologies. The journal has a dedicated Associate Editor for inertial confinement fusion.