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Self-consistent pedestal prediction for JET-ILW in preparation of the DT campaign
KTH, School of Electrical Engineering and Computer Science (EECS), Fusion Plasma Physics.ORCID iD: 0000-0002-9546-4494
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2019 (English)In: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 26, no 7, article id 072501Article in journal (Refereed) Published
Abstract [en]

The self-consistent core-pedestal prediction model of a combination of EPED1 type pedestal prediction and a simple stiff core transport model is able to predict Type I ELMy (edge localized mode) pedestals of a large JET-ILW (ITER-like wall) database at the similar accuracy as is obtained when the experimental global plasma β is used as input. The neutral penetration model [R. J. Groebner et al., Phys. Plasmas 9, 2134 (2002)] with corrections that take into account variations due to gas fueling and plasma triangularity is able to predict the pedestal density with an average error of 15%. The prediction of the pedestal pressure in hydrogen plasma that has higher core heat diffusivity compared to a deuterium plasma with similar heating and fueling agrees with the experiment when the isotope effect on the stability, the increased diffusivity, and outward radial shift of the pedestal are included in the prediction. However, the neutral penetration model that successfully predicts the deuterium pedestal densities fails to predict the isotope effect on the pedestal density in hydrogen plasmas.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2019. Vol. 26, no 7, article id 072501
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Physical Sciences
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URN: urn:nbn:se:kth:diva-262612DOI: 10.1063/1.5096870ISI: 000478679900045Scopus ID: 2-s2.0-85069160259OAI: oai:DiVA.org:kth-262612DiVA, id: diva2:1362011
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QC 20191017

Available from: 2019-10-17 Created: 2019-10-17 Last updated: 2019-11-05Bibliographically approved

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Frassinetti, LorenzoFridström, Richard

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