Addressing the impact of Lyman opacity in inference of divertor plasma conditions with 2D spectroscopic camera analysis of Balmer emission during detachment in JET L-mode plasmas
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Le résumé fourni par la source
The impact of re-absorption of the deuterium Lyman series emission was addressed in inferring divertor plasma conditions from Balmer series emission with 2D spectroscopic camera analysis during detachment in JET L-mode plasmas. The previously presented methodology was amended by modifying the standard photon emission coefficients and ionization and recombination rate coefficients of the ADAS database to consider the re-population of excited states due to Lyman opacity. This resulted in the estimate for the atomic density near the outer strike point to decrease by up to 75% at the onset of detachment at strike point temperatures of T e,osp ≈ 1.0–3.0 eV with respect to the strongly overestimated previously obtained values, whereas the estimated electron temperature and density were unaffected by the opacity correction within the scatter of the data and only a moderate reduction by up to 20% was observed in the estimate for the molecularly induced fraction of the Balmer emission. No noticeable change was seen in the ionization rate, calculated from the estimated outer strike point conditions, due to the decrease in the atomic density estimate compensating for the increased values of the opacity-corrected ADAS rate coefficients for ionization. In detached conditions at T e,osp ≈ 0.5–1.0 eV, 25%–35% lower recombination rates were provided by the opacity-corrected model. The observed effects on the experimental analysis were supported by a corresponding synthetic analysis based on EDGE2D-EIRENE simulations. • Lyman opacity addressed in spectroscopic divertor camera analysis in JET. • Estimate for atomic density significantly improved at onset of detachment. • Derived recombination rate decreased; ionization rate unchanged due to cross-effects.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Addressing the impact of Lyman opacity in inference of divertor plasma conditions with 2D spectroscopic camera analysis of Balmer emission during detachment in JET L-mode plasmas
- Date Crossref
- 01/03/2025
- Éditeur
- Elsevier BV
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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VTT Technical Research Centre of Finland pays non établi dans la noticeOrganisation à but non lucratif
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Oak Ridge National Laboratory pays non établi dans la noticeStructure de recherche
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Culham Centre for Fusion Energy pays non établi dans la noticeStructure de recherche
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Culham Science Centre pays non établi dans la noticeStructure de recherche
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Aalto University pays non établi dans la noticeUniversité ou école supérieure
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Lawrence Livermore National Laboratory pays non établi dans la noticeStructure de recherche
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UKAEA pays non établi dans la noticeInstitution
VTT Technical Research Centre of Finland, Oak Ridge National Laboratory et Culham Centre for Fusion Energy, avec 4 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.