通过对国际热核聚变实验堆中三维铍发射剖面的断层重建评估全球铍侵蚀情况

IF 2.1 2区 物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS
V. Neverov, R. Pitts, R. I. Khusnutdinov, Andrey G Alekseev, Evgeny Andreenko, Matthew Carr, Martin Kocan, Maarten De Bock, A. V. Gorshkov, Andrey M Kozlov, A. B. Kukushkin, J. Lovell, A. Meakins, Anton A Morozov, E. Veshchev
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引用次数: 0

摘要

提出了一种估算热核实验堆中铍 (Be) 全球侵蚀情况的新方法。该方法利用射线追踪辅助断层扫描技术,从 VIS/IR 广角观察系统的滤波相机捕获的图像、H-alpha(和可见光)光谱诊断以及分流器杂质监测器收集的信号中,重建边界等离子体中铍可见光发射率的三维(3D)轮廓。在此过程中,从面向等离子体的金属部件(PFC)反射到探测器的光被过滤掉。然后,利用重建的 Be 发射率,通过沿 PFC 表面法线积分发射率与 S/XB 系数的乘积,评估沿所有 Be PFC 的 Be 流入密度分布。通过与最近使用ERO2.0代码模拟ITER中全球Be侵蚀和迁移所产生的合成发射率数据进行比较,对该方法的准确性进行了评估。分析了 PFC 光反射特性的不确定性对重建三维 Be 发射率曲线和 Be 流入密度误差的影响。在远刮除层(SOL)等离子体密度较高的 H 模式核聚变功率运行条件下,该方法可以很准确地恢复等离子体浸润区的 Be 流入密度。在较低的远SOL等离子体密度和L模式运行条件下,只能高精度地重建Be侵蚀相对较高的第一壁板区域的Be流入总量。结果表明,忽略光反射的影响可能会导致 Be 总流入量被高估两倍。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Assessing global beryllium erosion via tomographic reconstruction of 3D beryllium emission profiles in ITER
A new method for estimating the global erosion of beryllium (Be) in ITER is proposed. The method uses ray tracing-aided tomography to reconstruct the three-dimensional (3D) profile of beryllium visible-light emissivity in boundary plasma from images captured with filtered cameras of VIS/IR wide angle viewing system, H-alpha (and Visible) Spectroscopy diagnostics and signals collected with divertor impurity monitor. The light reflected into the detectors from metallic plasma-facing components (PFCs) is filtered out in the process. The reconstructed Be emissivity is then used to assess the Be influx density distribution along all Be PFCs by integrating the product of the emissivity and the S/XB coefficient along the normal to the PFC surface. The accuracy of this method is evaluated by a comparison with synthetic emissivity data produced by recent simulation of global Be erosion and migration in ITER using the ERO2.0 code. The impact of the uncertainty of PFC light reflection properties on the error in reconstructing the 3D Be emissivity profile and Be influx density is analyzed. The method allows to recover with good accuracy the Be influx density in plasma-wetted areas under the conditions of H-mode fusion power operation with high plasma density in far scrape-off layer (SOL). Under the conditions of lower far-SOL plasma density and L-mode operation, only the total Be influx integrated over the area of the first wall panels with relatively high Be erosion can be reconstructed with a high accuracy. It is shown that neglecting the effects of light reflection may lead to a twofold overestimation of the total Be influx.
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来源期刊
Plasma Physics and Controlled Fusion
Plasma Physics and Controlled Fusion 物理-物理:核物理
CiteScore
4.50
自引率
13.60%
发文量
224
审稿时长
4.5 months
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.
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