Abstract
The purpose of the Spectral Line Shapes in Plasmas (SLSP) code comparison workshop is to compare different computational and analytical methods, in order to pinpoint sources of disagreements, infer limits of applicability, and assess accuracy. The present paper reviews a part of the results of the third (2015) and fourth (2017) workshops related to isolated lines.
Highlights
Line-shape analysis is a very important tool for diagnostics of both laboratory and space plasmas.With the increasing sensitivity of measurements and spectral resolution, in all domains of wavelengths from far UV to infrared, reliable diagnostics need accurate calculations
The spread of the results of the cases studied in SLSP1 and SLSP2, demanded a deeper investigation. It was a focus at SLSP3, and the detailed analysis continued at SLSP4
The under-threshold excitation process remains allowed and, more generally, the direct and inverse processes are related through the detailed-balance relation corresponding to T = ∞. This is clearly nonphysical with respect to cross-sections, and in SCP a symmetrization procedure [15] is used as a workaround
Summary
Line-shape analysis is a very important tool for diagnostics of both laboratory and space plasmas. When projectiles are electron or ions, this is the so-called Stark broadening It has been extensively developed for about 50 years and several different methods and numerical codes exist of varying complexity, and, necessarily, varying limits of applicability and accuracy. The spread of the results of the cases studied in SLSP1 and SLSP2 (see, in particular, Section 4 of [5]), demanded a deeper investigation. It was a focus at SLSP3, and the detailed analysis continued at SLSP4. A summary of the results is presented
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