Analysis of asymmetry of the Dα  emission spectra under the Zeeman effect in boundary region for D-D experiment on EAST tokamak

doi:10.1088/1674-1056/abc162

Abstract In 2015 campaign, deuterium atomic emission spectra (D_α) under the Zeeman effect in boundary region had been measured by a high resolution optical spectroscopic multichannel analysis (OSMA) system based on passive spectroscopy during the deuterium plasma discharge on EAST tokamak, and part of the works about the Zeeman effect on D_α spectra had already been done. However, the asymmetric phenomena of D_α emission spectra under the Zeeman effect were observed in process of analyzing the spectral data. To understand the asymmetric phenomena and acquire the useful local plasma information, an algorithm was proposed and used to analyze the asymmetry of the emission spectra under the Zeeman effect with all polarization components (π and σ). In the algorithm, the neutral atoms were considered to follow the Maxwell distribution on EAST, and I_{+ σ} ≠ I_-σ was considered and set. Because of the line-averaged spectra along the viewing chord, the emission spectra were considered from two different regions: low-field side (LFS) and high-field side (HFS). Each spectral line was classified into three energy categories (the cold, warm, and hot) based on different atomic production processes in boundary recycling. The viewing angle θ (between the magnetic field B and the viewing chord), magnetic field B at two spectral emission positions (HFS and LFS) and the Doppler shift of all three energy categories of each spectral line were all considered in the algorithm. The effect of instrument function was also included here. The information of the boundary plasma were acquired, the reason for the asymmetric phenomena was discussed, and the boundary recycling during the discharge were studied in the paper. Based on fitting a statistical data of acquired fitting results, an important conclusion was acquired that the ratio of the spectral line intensity in HFS and LFS was proportional to the square of that of the corresponding magnetic field.

Keywords: Zeeman effect deuterium atom spectral lineshape plasma

Received: 25 August 2020
Revised: 09 October 2020
Accepted manuscript online: 15 October 2020

PACS:

52.70.Kz

(Optical (ultraviolet, visible, infrared) measurements)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11805234).

Corresponding Authors: ^†Corresponding author. E-mail: gaowei@ipp.ac.cn

Cite this article:

Wei Gao(高伟), Juan Huang(黄娟), Jianxun Su(宿建勋), Jing Fu(付静), Yingjie Chen(陈颖杰), Wei Gao(高伟), Zhenwei Wu(吴振伟), and EAST Team Analysis of asymmetry of the D_α emission spectra under the Zeeman effect in boundary region for D-D experiment on EAST tokamak 2021 Chin. Phys. B 30 025201

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Analysis of asymmetry of the Dα emission spectra under the Zeeman effect in boundary region for D-D experiment on EAST tokamak

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Analysis of asymmetry of the D_α emission spectra under the Zeeman effect in boundary region for D-D experiment on EAST tokamak