Design of a Thomson scattering diagnostic for the SMall Aspect Ratio Tokamak (SMART).

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-09-01 DOI:10.1063/5.0219308

M Kaur, A Diallo, B LeBlanc, J Segado-Fernandez, E Viezzer, R B Huxford, A Mancini, D J Cruz-Zabala, M Podesta, J W Berkery, M Garcia-Muñoz

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Abstract

We describe the design of a Thomson scattering (TS) diagnostic to be used on the SMall Aspect Ratio Tokamak (SMART). SMART is a spherical tokamak being commissioned in Spain that aims to explore positive triangularity and negative triangularity plasma scenarios at a low aspect ratio. The SMART TS diagnostic is designed to operate at high spatial resolution, 6 mm scattering length in the low-field side and 9 mm in the high-field side regions, and a wide dynamic range, electron temperature from 1 eV to 1 keV and density from 5×1018m-3 to 1×1020m-3, to resolve large gradients formed at the plasma edge and in the scrape-off layer (SOL) under different triangularities and low aspect ratios. A 2 J @1064 nm laser will be used that is capable of operating in the burst mode at 1, 2, and 4 kHz to investigate fast phenomena and at 30 Hz to study 1 s (or more) long discharges. The scattered light will be collected over an angular range of 60° - 120° from 28 spatial points in the midplane covering the entire plasma width and the outer midplane SOL. Each scattering signal will be spectrally resolved on five wavelength channels of a polychromator to obtain the electron temperature measurement. We will also present a method to monitor in situ laser alignment in the core during calibrations and plasma operations.

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为小长径比托卡马克（SMART）设计汤姆逊散射诊断仪。

我们介绍了将在小纵横比托卡马克（SMART）上使用的汤姆逊散射（TS）诊断仪的设计。SMART 是一个正在西班牙试运行的球形托卡马克，旨在探索低纵横比的正三角和负三角等离子体情况。SMART TS 诊断仪设计为在高空间分辨率（低场侧 6 毫米散射长度和高场侧 9 毫米散射长度）和宽动态范围（电子温度从 1 eV 到 1 keV，密度从 5×1018m-3 到 1×1020m-3）下运行，以分辨不同三角形和低纵横比下等离子体边缘和刮除层（SOL）形成的大梯度。将使用 2 J @1064 nm 激光器，该激光器能够以 1、2 和 4 kHz 的脉冲串模式工作，以研究快速现象，并以 30 Hz 的频率研究 1 秒（或更长时间）的长放电。散射光将在 60° - 120° 的角度范围内从覆盖整个等离子体宽度的中面和外中面 SOL 的 28 个空间点收集。每个散射信号都将在多色仪的五个波长通道上进行光谱解析，以获得电子温度测量值。我们还将介绍一种方法，用于在校准和等离子体运行期间监测核心的原位激光对准情况。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.