Testing the role of molecular physics in dissipative divertor operations through helium plasmas at DIII-D

dc.contributorAalto Universityen
dc.contributor.authorCanik, J. M.en_US
dc.contributor.authorBriesemeister, A.R.en_US
dc.contributor.authorMcLean, A.G.en_US
dc.contributor.authorGroth, M.en_US
dc.contributor.authorLeonard, A.W.en_US
dc.contributor.authorLore, J. D.en_US
dc.contributor.authorMoser, A. L.en_US
dc.contributor.departmentDepartment of Applied Physicsen
dc.contributor.groupauthorFusion and Plasma Physicsen
dc.contributor.organizationOak Ridge National Laboratoryen_US
dc.contributor.organizationLawrence Livermore National Laboratoryen_US
dc.contributor.organizationGeneral Atomicsen_US
dc.description.abstractRecent experiments in DIII-D helium plasmas are examined to resolve the role of atomic and molecular physics in major discrepancies between experiment and modeling of dissipative divertor operation. Helium operation removes the complicated molecular processes of deuterium plasmas that are a prime candidate for the inability of standard fluid models to reproduce dissipative divertor operation, primarily the consistent under-prediction of radiated power. Modeling of these experiments shows that the full divertor radiation can be accounted for, but only if measures are taken to ensure that the model reproduces the measured divertor density. Relying on upstream measurements instead results in a lower divertor density and radiation than is measured, indicating a need for improved modeling of the connection between the divertor and the upstream scrape-off layer. These results show that fluid models are able to quantitatively describe the divertor-region plasma, including radiative losses, and indicate that efforts to improve the fidelity of the molecular deuterium models are likely to help resolve the discrepancy in radiation for deuterium plasmas.en
dc.description.versionPeer revieweden
dc.identifier.citationCanik, J M, Briesemeister, A R, McLean, A G, Groth, M, Leonard, A W, Lore, J D & Moser, A L 2017, ' Testing the role of molecular physics in dissipative divertor operations through helium plasmas at DIII-D ', Physics of Plasmas, vol. 24, no. 5, 056116 . https://doi.org/10.1063/1.4982057en
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dc.relation.ispartofseriesPhysics of Plasmasen
dc.relation.ispartofseriesVolume 24, issue 5en
dc.titleTesting the role of molecular physics in dissipative divertor operations through helium plasmas at DIII-Den
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi