Measurement of Stark-split beam and carbon charge exchange emissions for simultaneous B-field and temperature/rotation analysis at DIII-D

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-09-11 DOI:10.1063/5.0219534

R. Albosta, B. Geiger, G. McKee, O. Marchuk, T. Gallenberger, F. Khabanov, D. Den Hartog

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Abstract

A set of two newly designed, single-channel Czerny–Turner spectrometers has been deployed at the DIII-D tokamak for measurements of the motional Stark effect (MSE) split beam emission and the C6+ (CVI) carbon charge exchange recombination (CER) emission at high spectral (δλ = 0.13 nm) and temporal (1–5 kHz) resolution. High throughput optics (f/# = 2.8) allow for good signal-to-noise at high time resolution using fast EMCCD detectors. The MSE emission allows for spectral fitting of the magnitude and direction of the local B-field, while the carbon emission yields local ion temperature and toroidal rotation information. To reduce so-called Doppler broadening of the MSE emission, a new channel-specific variable lens-masking approach has been developed. Experimental data collected from the 2023 DIII-D experimental campaign demonstrate the signal quality and instrument fidelity for both diagnostic measurements. Moreover, initial CER data analysis shows a clear evolution of the toroidal rotation during edge localized modes. Initial progress on the advanced MSE model, including a new validated ray-trace model of the DIII-D collection optics, is shown via sensitivity analysis.

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测量斯塔克分裂光束和碳电荷交换发射，以便在 DIII-D 同步进行 B 场和温度/旋转分析

在 DIII-D 托卡马克部署了一套两台新设计的单通道 Czerny-Turner 光谱仪，用于测量高光谱（δλ = 0.13 nm）和高时间（1-5 kHz）分辨率的运动斯塔克效应（MSE）分裂光束发射和 C6+（CVI）碳电荷交换重组（CER）发射。高通量光学器件（f/# = 2.8）允许使用快速 EMCCD 探测器在高时间分辨率下获得良好的信噪比。MSE 辐射可对局部 B 场的大小和方向进行光谱拟合，而碳辐射则可提供局部离子温度和环状旋转信息。为了减少 MSE 发射的所谓多普勒展宽，开发了一种新的特定通道可变透镜掩蔽方法。从 2023 年 DIII-D 实验活动中收集的实验数据证明了这两项诊断测量的信号质量和仪器保真度。此外，初步的 CER 数据分析显示了边缘局部模式期间环形旋转的明显演变。通过灵敏度分析，显示了高级 MSE 模型的初步进展，包括 DIII-D 收集光学器件的新验证光线跟踪模型。

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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.