Abstract
Various codes of line-shape modeling are compared to each other through the profile of the C II 723-nm line for typical plasma conditions encountered in the ablation clouds of carbon pellets, injected in magnetic fusion devices. Calculations were performed for a single electron density of 10 17 cm −3 and two plasma temperatures (T = 2 and 4 eV). Ion and electron temperatures were assumed to be equal (Te = Ti = T). The magnetic field, B, was set equal to either to zero or 4 T. Comparisons between the line-shape modeling codes and two experimental spectra of the C II 723-nm line, measured perpendicularly to the B-field in the Large Helical Device (LHD) using linear polarizers, are also discussed.
Highlights
Comparing synthetic line profiles in plasmas carried out with different codes and simulation methods is certainly an interesting issue, which can help to validate the underlying models
We present here the five numerical simulation codes and models used by the contributors to model the line-shapes of the C II 723-nm line for four cases sharing the same electron density of ne = 1017 cm−3 but for two distinct values of the electron temperature Te = 2 eV and Te = 4 eV, without and with a magnetic field (B = 4 T)
Several line-shapes codes were compared through the modeling of the C II 723-nm line profile for four situations corresponding to a fixed electron density of 1017 cm−3, two temperatures
Summary
Comparing synthetic line profiles in plasmas carried out with different codes and simulation methods is certainly an interesting issue, which can help to validate the underlying models. Checking the reliability of a model requires its comparison with experimental data. Code comparisons become more challenging if they include confrontation with experimental measurements Such comparisons, between theory and experiment, were not scheduled in the first workshop on Spectral Line Shapes in Plasmas: code comparison [1]. Between theory and experiment, were not scheduled in the first workshop on Spectral Line Shapes in Plasmas: code comparison [1] To fill this gap, data from two experiments were introduced in the second workshop (5–9 August, 2013, Vienna). Data from two experiments were introduced in the second workshop (5–9 August, 2013, Vienna) These experimental cases were aimed to allow detailed discussion on the approaches adopted by different research groups to analyze experimental spectra. The present paper deals only with the first experimental case, i.e., the C II 723-nm line
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