Show simple item record

dc.contributor.authorKube, Ralph
dc.contributor.authorGarcia, Odd Erik
dc.contributor.authorTheodorsen, Audun
dc.contributor.authorKuang, Adam
dc.contributor.authorLaBombard, Brian
dc.contributor.authorTerry, Jim L.
dc.contributor.authorBrunner, Dan
dc.date.accessioned2019-03-22T11:44:59Z
dc.date.available2019-03-22T11:44:59Z
dc.date.issued2018-12-29
dc.description.abstractThe Alcator C-Mod mirror Langmuir probe diagnostic is used to characterize plasma fluctuations in the outboard mid-plane scrape-off layer (SOL). Ohmically heated L-mode plasmas with Greenwald fractions from 0.1 to 0.45 are analyzed. In plasmas with a low line-averaged core density, the radial profiles of the average electron density and temperature feature a two-scale structure with a strong gradient in the near-SOL and a weak gradient in the far-SOL. The relative fluctuation levels of the electron density are below 25% throughout the entire SOL and the fluctuation driven heat flux is dominated by plasma density fluctuations. In the plasma with the highest line-averaged core density, the radial profiles of the electron density and temperature feature only a single weak gradient length scale across the SOL. The plasma density at the limiter radius is approximately 10 times larger than in low-density discharges. The average electron temperature at the separatrix falls to approximately 30 eV while the magnitude of the relative temperature fluctuations increases with the line-averaged core plasma density. With increasing plasma density, the fluctuation-driven heat fluxes increase by more than one order of magnitude while retaining a relative fluctuation level of approximately 3. Even though the SOL is on average cooler than in low density discharges, large electron temperature fluctuations govern the turbulence driven heat flux towards the wall while contributions from density fluctuations and triple correlations contribute approximately 35% and 15%, respectively.en_US
dc.description.sponsorshipUnited States Department of Energyen_US
dc.descriptionSource at <a href=https://doi.org/10.1016/j.nme.2018.11.021>https://doi.org/10.1016/j.nme.2018.11.021</a>.en_US
dc.identifier.citationKube, R., Garcia, O.E., Theodorsen, A., Kuang, A., LaBombard, B., Terry, J.L. & Brunner, D. (2019). Statistical properties of the plasma fluctuations and turbulent cross-field fluxes in the outboard mid-plane scrape-off layer of Alcator C-Mod. <i>Nuclear Materials and Energy, 18</i>, 193-200. https://doi.org/10.1016/j.nme.2018.11.021en_US
dc.identifier.cristinIDFRIDAID 1660950
dc.identifier.doi10.1016/j.nme.2018.11.021
dc.identifier.issn2352-1791
dc.identifier.urihttps://hdl.handle.net/10037/15046
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.journalNuclear Materials and Energy
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/FRINATEK/240510/Norway/Turbulence and transport at the boundary of fusion plasmas//en_US
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437en_US
dc.titleStatistical properties of the plasma fluctuations and turbulent cross-field fluxes in the outboard mid-plane scrape-off layer of Alcator C-Moden_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


File(s) in this item

Thumbnail

This item appears in the following collection(s)

Show simple item record