Tomographic reconstructions of the fast-ion phase space using imaging neutral particle analyser measurements

IF 2.1 2区物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS

Plasma Physics and Controlled Fusion Pub Date : 2024-05-09 DOI:10.1088/1361-6587/ad4486

J Rueda-Rueda, M Garcia-Munoz, E Viezzer, P A Schneider, P Oyola, J Galdon-Quiroga, M Salewski, B S Schmidt, J Garcia-Dominguez, ASDEX Upgrade team4

引用次数: 0

Abstract

In this paper we demonstrate how the inversion, in energy and major radius (E, R) coordinates, of imaging neutral particle analyser (INPA) measurements can be used to obtain the fast-ion distribution. The INPA is most sensitive to passing ions with energies in the range (20–150) keV and pitches near 0.5 in the core and 0.7 near the plasma edge. Inversion of synthetic signals, via 0th-order Tikhonov and Elastic Net regularization, were performed to demonstrate the capability of recovering the ground truth fast-ion 2D phase-space distribution resolved in major radius and energy, even in the presence of moderate noise levels (10%). Finally, we apply our method to measure the 2D phase-space distribution in an MHD quiescent plasma at ASDEX Upgrade and find good agreement with the slowing down fast-ion distribution predicted by TRANSP.

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利用成像中性粒子分析仪的测量结果对快离子相空间进行断层重构

在本文中，我们展示了如何利用成像中性粒子分析仪（INPA）测量的能量和主要半径（E，R）坐标反演来获得快速离子分布。INPA 对能量在 (20-150) 千伏范围内的过路离子最为敏感，在核心区的间距接近 0.5，在等离子体边缘接近 0.7。通过 0 次 Tikhonov 正则化和弹性网正则化对合成信号进行反演，证明了即使在中等噪声水平（10%）的情况下，也能恢复分辨主要半径和能量的地面真实快速离子二维相空间分布。最后，我们在 ASDEX 升级中应用我们的方法测量了 MHD 静止等离子体中的二维相空间分布，发现与 TRANSP 预测的减速快离子分布非常吻合。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

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.