WFRF:(Reinke M. L.)
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The Ar(17+) Ly(alpha 2)/Ly(alpha 1) ratio in Alcator C-Mod tokamak plasmas
- Rice, J. E. (author)
- Reinke, M. L. (author)
- Ashbourn, J. M. A. (author)
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- Ince-Cushman, A. C. (author)
- Podpaly, Y. A. (author)
- Gu, M. F. (author)
- Bitter, M. (author)
- Hill, K. (author)
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- (creator_code:org_t)
- 2011-07-25
- 2011
- English.
- In: Journal of Physics B. - : IOP Publishing. - 0953-4075 .- 1361-6455. ; 44:16, s. 165702-
- Journal article (peer-reviewed)
Abstract
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- High-quality spectra of hydrogen-like Ar(17+) have been obtained from Alcator C-Mod tokamak plasmas using a spatially imaging high-resolution x-ray spectrometer system in an extensive study of the underlying high-n satellite lines. The ratio of Ly(alpha 2) (1S(1/2)-2P(1/2)) to Ly(alpha 1) (1S(1/2)-2P(3/2)) was found to be similar to 0.52 regardless of plasma parameters, which is somewhat greater than the ratio of the statistical weights of the upper n = 2 levels, 0.5. This difference is mainly due to the effects of collisional excitation of fine-structure sub-levels. For the observations presented here, electron densities were in an extended range from 3 x 10(19) to 4 x 10(20) m(-3) with electron and ion temperatures between 1 and 4 keV. Experimental results are compared to calculations from COLRAD, a collisional-radiative modelling code, and good agreement is shown.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Keyword
- hydrogen-like ions
- ti-xxii
- precision-measurement
- intensity ratios
- fine-structure
- atomic levels
- one-electron
- lamb shift
- temperature
- transitions
Publication and Content Type
- ref (subject category)
- art (subject category)
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