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Observations of H-like Ne X and He-like Ne IX soft X-ray emission line spectra have been made on the JET tokamak. Recently calculated electron impact excitation rates for He-like neon are used in the derivation of the electron temperature sensitive line ratios and the electron density sensitive ratio. Extensive modelling is carried out to allow for non-coronal conditions due to diffusion effects in these calculations, which are compared with experimental ratios from JET, where independent temperature and density measurements are available. Departures from equilibrium are found for both ohmic and additionally heated plasmas, resulting in significant changes to the above ratios. The R ratio is approaching its upper density limit and is relatively unaffected by non-coronal conditions. Good agreement between the experimental and calculated ratios is found, giving an indication of the accuracy of the combination of atomic data and transport employed in the calculations. This implies that the theoretical results may be applied to the analysis of remote plasma sources for derivation of these parameters.

Additional information

Authors: COFFEY I H, Queens University, Department of Pure and Applied Physics, Belfast (GB);KEENAN F P, Queens University, Department of Pure and Applied Physics, Belfast (GB);BARNSLEY R, JET Joint Undertaking, Abingdon, Oxon. (GB);PEACOCK N J, Culham Laboratory, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(93)78 EN (1993) 18 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
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