Measurements of electron density and temperature in the H-1 heliac plasma by helium line intensity ratios |
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Authors: | Ma Shuiliang Howard John Blackwell Boyd D Thapar Nandika |
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Affiliation: | Plasma Research Laboratory, Australian National University, Canberra ACT 0200, Australia. shuiliang.ma@anu.edu.au |
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Abstract: | Electron density and temperature distributions in the H-1 heliac plasma are measured using the helium line intensity ratio technique based on a collisional-radiative model. An inversion approach with minimum Fisher regularization is developed to reconstruct the ratios of the local emission radiances from detected line-integrated intensities. The electron density and temperature inferred from the He I 667.8/728.1 and He I 728.1/706.5 nm line ratios are in good agreement with those from other diagnostic techniques in the inner region of the plasma. The electron density and temperature values appear to be a little high in the outer region of the plasma. Some possible causes of the discrepancy in the outer region are discussed. |
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