Helium-like Ne IX in the JET tokamak.
Abstract
New calculations are presented of the electron density sensitive emission line ratio R = I(1s2 1S0 - 1s2s 3S1)/ I(1s2 1S0 - 1s2p 3P1,2), and the electron temperature sensitive emission line ratios G = [I(1s2 1S0 - 1s2s 3S1) + (1s2 1S0 - 1s2p 3P1,2)]/ I(1s2 1S0 - 1s2p 1P1) and R1 = I(1s2 1S0 - 1s3p 1P1)/ I(1s2 1S0 - 1s2p 1P1). They are compared with measured ratios from the JET (Joint European Torus) plasma where the electron temperature and density have been determined by independent means. Consideration is given to diffusion effects which cause a departure from coronal equilibrium conditions, resulting in significant changes to the G ratio. These measurements are made in the absence of blending with Fe XVIII, Fe XIX and Na X lines which are sources of error in solar measurements. Good agreement with theory is found, with discrepancies of typically less than 10%. This implies that the theoretical results may be applied to the analysis of remote plasma sources for which no independent electron density and temperature estimates exist, such as solar flares and active regions.
- Publication:
-
UV and X-ray Spectroscopy of Laboratory and Astrophysical Plasmas
- Pub Date:
- 1993
- Bibcode:
- 1993uxrs.conf..537C
- Keywords:
-
- X-Ray Lines: Neon;
- X-Ray Lines: Plasma Diagnostics;
- X-Ray Lines: Solar Atmosphere