Radial profiles and emissivity ratio analysis of Ne-like FeXVII n = 3‑2 transitions in Large Helical Device
Abstract
The radial profiles of the FeXVII 3s-2p and 3d-2p transitions emitted in the wavelength range of 15 ‑ 17 Å have been observed in the Large Helical Device (LHD). The chord-integrated radial profiles are converted into radial emissivity profiles by means of Abel inversion. The emissivity ratios among FeXVII n = 3‑2 transitions calculated from the radial emissivity profiles are compared with calculations based on a collisional-radiative (CR) model developed for Fe ions. The result reasonably confirms the effect of electron temperature and density on the emissivity ratio. However, the emissivity of the 3C (2p53d1P1 → 2p6) transition is obviously lower than the prediction from the CR model. This discrepancy is consistent with measurements in the solar corona and other laboratory plasmas.
- Publication:
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Journal of Korean Physical Society
- Pub Date:
- October 2014
- DOI:
- 10.3938/jkps.65.1265
- Bibcode:
- 2014JKPS...65.1265H
- Keywords:
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- FeXVII;
- Emissivity ratio;
- EUV spectroscopy