What is it about?
The chosen spectra collected during the W7-X campaign (OP1.2b) were examined, trying to obtain an agreement between the observed and simulated spectra. The analysis carried out allowed for a reliable interpretation of experimental x-ray spectra, estimation of the electron temperature, and obtaining information on the content of tungsten impurities.
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Why is it important?
On the base of the analysis, the set of benchmark x-ray spectra for different ionization stages of tungsten, electron temperature, and density of plasma in the energy range of emitted radiation, important for plasma diagnostics on the W7-X stellarator were obtained. Thanks to the performed analysis, it was possible to make a reliable interpretation of the experimental x-ray spectra, registered by the PHA system at the W7-X stellarator, estimate electron temperature, and obtain information about the tungsten impurity content. Moreover, the W Ll, Lα1,2, and Lβ1,3 x-ray lines at a photon energy of about 7635, 8625, and 9915 eV, respectively, were identified and observed for the first time at W7-X. It was also shown that the FAC code is a tool capable of the simulation of tungsten spectra in plasmas generated at W7-X.
Perspectives
The results of this research may contribute to the development of plasma diagnostics produced at W7-X and the largest tokamak in the world—ITER, currently built (in the south of France).
Łukasz Syrocki
Institute of Plasma Physics and Laser Microfusion
Read the Original
This page is a summary of: Theoretical interpretation of W soft X-ray spectra collected by the pulse height analysis system on Wendelstein 7-X stellarator, Physics of Plasmas, June 2024, American Institute of Physics,
DOI: 10.1063/5.0210977.
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