Analysis of the Zeeman effect on Dα spectra on the EAST tokamak

doi:10.1088/1674-1056/26/4/045203

Abstract Based on the passive spectroscopy, the D_α atomic emission spectra in the boundary region of the plasma have been measured by a high resolution optical spectroscopic multichannel analysis (OSMA) system in EAST tokamak. The Zeeman splitting of the D_α spectral lines has been observed. A fitting procedure by using a nonlinear least squares method was applied to fit and analyze all polarization π and ±σ components of the D_α atomic spectra to acquire the information of the local plasma. The spectral line shape was investigated according to emission spectra from different regions (e.g., low-field side and high-field side) along the viewing chords. Each polarization component was fitted and classified into three energy categories (the cold, warm, and hot components) based on different atomic production processes, in consistent with the transition energy distribution by calculating the gradient of the D_α spectral profile. The emission position, magnetic field intensity, and flow velocity of a deuterium atom were also discussed in the context.

Keywords: Zeeman effect plasma spectrum deuterium

Received: 28 November 2016
Revised: 17 January 2017
Accepted manuscript online:

PACS:

52.70.Kz

(Optical (ultraviolet, visible, infrared) measurements)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11275231 and 11575249) and the National Magnetic Confinement Fusion Energy Research Program of China (Grant No. 2015GB110005).

Corresponding Authors: Wei Gao, Juan Huang
E-mail: gaowei@ipp.ac.cn;juan.huang@ipp.ac.cn

Cite this article:

Wei Gao(高伟), Juan Huang(黄娟), Chengrui Wu(吴承瑞), Zong Xu(许棕), Yumei Hou(侯玉梅), Zhao Jin(金钊), Yingjie Chen(陈颖杰), Pengfei Zhang(张鹏飞), Ling Zhang(张凌), Zhenwei Wu(吴振伟), EAST Team Analysis of the Zeeman effect on D_α spectra on the EAST tokamak 2017 Chin. Phys. B 26 045203

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Analysis of the Zeeman effect on Dα spectra on the EAST tokamak

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Analysis of the Zeeman effect on D_α spectra on the EAST tokamak