H sub( alpha ) line shape in front of the limiter in the HT-6M tokamak

The H sub( alpha ) line shape in front of the limiter in the HT-6M tokamak is analyzed by multi-Gaussian fitting. The energy distribution of neutral hydrogen atoms reveals that H sub( alpha ) radiation is contributed by Franck-Condon atoms, atoms reflected at the limiter surface and charge exchange....

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Published in:Nuclear fusion 1999-01, Vol.39 (Special Issu), p.1865-1869
Main Authors: Wan, Baonian, Li, Jiangang, Luo, Jiarong, Xie, Jikang, Wu, Zhenwei, Zhang, Xianmei
Format: Article
Language:English
Subjects:
Atoms
Computer simulation
Curve fitting
Dissociation
Hydrogen
Ions
Molecules
Monte Carlo methods
Plasma confinement
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container_end_page 1869
container_issue Special Issu
container_start_page 1865
container_title Nuclear fusion
container_volume 39
creator Wan, Baonian
Li, Jiangang
Luo, Jiarong
Xie, Jikang
Wu, Zhenwei
Zhang, Xianmei
description The H sub( alpha ) line shape in front of the limiter in the HT-6M tokamak is analyzed by multi-Gaussian fitting. The energy distribution of neutral hydrogen atoms reveals that H sub( alpha ) radiation is contributed by Franck-Condon atoms, atoms reflected at the limiter surface and charge exchange. Multi-Gaussian fitting of the H sub( alpha ) spectral profile indicates contributions of 60% from reflection particles and 40% from molecule dissociation to recycling. Ion temperatures in central regions are obtained from the spectral width of charge exchange components. Dissociation of hydrogen molecules and reflection of particles at the limiter surface are dominant in edge recycling. Reduction of particle reflection at the limiter surface is important for controlling edge recycling. The measured profiles of neutral hydrogen atom density are reproduced by a particle continuity equation and a simplified one dimensional Monte Carlo simulation code.
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source Institute of Physics:Jisc Collections:IOP Publishing Read and Publish 2024-2025 (Reading List)
subjects Atoms
Computer simulation
Curve fitting
Dissociation
Hydrogen
Ions
Molecules
Monte Carlo methods
Plasma confinement
title H sub( alpha ) line shape in front of the limiter in the HT-6M tokamak
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