| Numéro |
J. Phys. Colloques
Volume 50, Numéro C1, Janvier 1989
International Conference on the Physics of Multiply Charged Ions and International Workshop on E.C.R. Ion Sources
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|---|---|---|
| Page(s) | C1-559 - C1-564 | |
| DOI | https://doi.org/10.1051/jphyscol:1989159 | |
J. Phys. Colloques 50 (1989) C1-559-C1-564
DOI: 10.1051/jphyscol:1989159
THEORETICAL ELECTRON DENSITY AND TEMPERATURE SENSITIVE EMISSION LINE RATIOS FOR HELIUM-LIKE Si XIII COMPARED TO DITE TOKAMAK OBSERVATIONS
F.P. KEENAN1, R. BARNSLEY2, J. DUNN2, K.D. EVANS2, S.M. McCANN1 and N.J. PEACOCK31 Department of Pure and Applied Physics, Queen's University of Belfast, Belfast BT7 1NN, IR-Northern, Ireland
2 Department of Physics, University of Leicester, LE1 7RH, GB-Leicester, Great-Britain
3 Culham Laboratory (Euratom/UKAEA Fusion Association), OX14 3DB, GB-Oxford, Great-Britain
Abstract
New calculations of the electron density sensitive emission line ratio R (= f/i) and temperature sensitive ratio G (= (f+i)/r) in helium-like Si XIII are presented, where f, i and r are the forbidden 1s2 1S - 1s2s 3S, intercombination 1s21S - 1s2p 3P1,2 and resonance ls21S - 1s2p 1P transitions, respectively. A comparison of these with R and G ratios measured from x-ray spectra of the DITE tokamak, for which the electron density and temperature have been well determined, reveals excellent agreement between theory and observation, with discrepancies of typically less than 10%. This provides experimental support for the accuracy of the atomic data adopted in the line ratio calculations. The theoretical results may therefore be applied with confidence to the analysis of remote sources for which no independant electron density and temperature estimates exist, such as solar flares.