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The Ar(17+) Ly(alph...
The Ar(17+) Ly(alpha 2)/Ly(alpha 1) ratio in Alcator C-Mod tokamak plasmas
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Rice, J. E. (författare)
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Reinke, M. L. (författare)
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Ashbourn, J. M. A. (författare)
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Ince-Cushman, A. C. (författare)
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Podpaly, Y. A. (författare)
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Gu, M. F. (författare)
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Bitter, M. (författare)
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Hill, K. (författare)
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- Rachlew, Elisabeth (författare)
- KTH,Atom- och molekylfysik
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(creator_code:org_t)
- 2011-07-25
- 2011
- Engelska.
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Ingår i: Journal of Physics B. - : IOP Publishing. - 0953-4075 .- 1361-6455. ; 44:16, s. 165702-
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Nyckelord
- hydrogen-like ions
- ti-xxii
- precision-measurement
- intensity ratios
- fine-structure
- atomic levels
- one-electron
- lamb shift
- temperature
- transitions
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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