Development of a multi-spectral extreme ultraviolet imaging diagnostics on the Experimental Advanced Superconducting Tokamak

IF 1.9 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Fusion Engineering and Design Pub Date : 2024-10-07 DOI:10.1016/j.fusengdes.2024.114681

Shanwei Hou , Tingfeng Ming , Haoxuan Si , Shengzhen Yi , QiQi Shi , Rongjing Deng , Wenmin Zhang , Yue Yu , Xiaoju Liu , Gongshun Li , Ling Zhang , Genfan Ding , Motoshi Goto , Tao Zhang , Zhe Zhang , Zhanshan Wang , Xiang Gao , Guoqiang Li

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Abstract

A multi-spectral extreme ultraviolet imaging (MEUVI) diagnostics to measure impurity line emissions on the Experimental Advanced Superconducting Tokamak (EAST) is proposed and being developed to measure the electron temperature at the edge region. It makes use of multi-channel multilayers Schwarzschild telescope, coupled with a micro-channel plate (MCP) equipped with a P46 phosphor screen, and a high-speed camera with a CMOS sensor to image the selected line emissions, i.e., C IV lines (312.4 Å, 419.7 Å), W XLVI line (127 Å), Ne VIII lines (88.1 Å, 103 Å), and Ne VII Line (465.2 Å), at the edge region in two dimensions with high spatial and temporal resolutions simultaneously. The MEUVI diagnostics is installed on the EAST horizontal J port to monitor plasma and first imaging data is obtained during the commissioning of the system in the 2024 experiment campaign. It is in good agreement with that measured by the traditional extreme ultraviolet (EUV) spectrometer. In addition, the electron temperature derived from the MEUVI data is higher than that given by the Helium beam emission (He-BES) spectroscopy system since the Ne VIII emission is mainly located inside the last closed surface region. However, the tendency of the evolution of the electron temperature is consistent each other, which are given by these two systems. These results verify that the MEUVI diagnostics can work as a potential tool for the measurement of edge plasma temperature and monitoring of impurities.

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在先进超导实验托卡马克上开发多光谱极紫外成像诊断仪

提出并正在开发用于测量先进超导实验托卡马克（EAST）杂质线发射的多光谱极紫外成像（MEUVI）诊断技术，以测量边缘区域的电子温度。它利用多通道多层施瓦兹柴尔德望远镜、配备 P46 荧光屏的微通道板 (MCP) 和配备 CMOS 传感器的高速相机，以高空间和时间分辨率同时对边缘区域的选定发射线（即 C IV 线（312.4 Å，419.7 Å）、W XLVI 线（127 Å）、Ne VIII 线（88.1 Å，103 Å）和 Ne VII 线（465.2 Å））进行二维成像。MEUVI 诊断仪安装在东隅水平 J 端口，用于监测等离子体，在 2024 年实验活动的系统调试期间获得了第一批成像数据。该数据与传统的极紫外（EUV）光谱仪测量的数据十分吻合。此外，MEUVI 数据得出的电子温度高于氦束射（He-BES）光谱系统给出的温度，因为 Ne VIII 的发射主要位于最后一个封闭的表面区域内。不过，这两个系统给出的电子温度演变趋势是一致的。这些结果验证了 MEUVI 诊断系统可以作为测量边缘等离子体温度和监测杂质的潜在工具。

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来源期刊

Fusion Engineering and Design 工程技术-核科学技术

CiteScore

3.50

自引率

23.50%

发文量

275

审稿时长

3.8 months

期刊介绍： The journal accepts papers about experiments (both plasma and technology), theory, models, methods, and designs in areas relating to technology, engineering, and applied science aspects of magnetic and inertial fusion energy. Specific areas of interest include: MFE and IFE design studies for experiments and reactors; fusion nuclear technologies and materials, including blankets and shields; analysis of reactor plasmas; plasma heating, fuelling, and vacuum systems; drivers, targets, and special technologies for IFE, controls and diagnostics; fuel cycle analysis and tritium reprocessing and handling; operations and remote maintenance of reactors; safety, decommissioning, and waste management; economic and environmental analysis of components and systems.