Accurate Determination of Iron Density in Large Helical Device Based on Absolute Intensity Profile Measurement of Extreme Ultraviolet Spectral Lines

An iron density profile is accurately determined in Large Helical Device (LHD) using a space-resolved extreme ultraviolet (EUV) spectrometer, the absolute intensity calibration of which is carried out by bremsstrahlung continuum measurement. The effective intensity coefficients R (eV cm 3 s -1 ) of...

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Bibliographic Details
Published inJapanese Journal of Applied Physics Vol. 51; no. 1R; p. 10205
Main Authors Dong, Chunfeng, Morita, Shigeru, Goto, Motoshi, Wang, Erhui, Murakami, Izumi, Yamamoto, Norimasa
Format Journal Article
LanguageEnglish
Published 01.01.2012
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Summary:An iron density profile is accurately determined in Large Helical Device (LHD) using a space-resolved extreme ultraviolet (EUV) spectrometer, the absolute intensity calibration of which is carried out by bremsstrahlung continuum measurement. The effective intensity coefficients R (eV cm 3 s -1 ) of FeXV to FeXXIV are precisely calculated on the basis of a collisional-radiative model for iron density determination. The total iron density at the plasma center is found to be almost 4 or 5 orders of magnitude smaller than the electron density. The application of the present result to the study of impurity transport demonstrates a new way of examining the radial structure of transport coefficients and of determining the total impurity density.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.51.010205