Neoclassical and turbulent e × B flows in flux-driven gyrokinetic simulations of Ohmic tokamak plasmas

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Niskala, P. Gurchenko, A. D. Gusakov, E. Z. Altukhov, A. B. Esipov, L. A. Chôné, L. Kiviniemi, T. P. Leerink, S. 2018-11-02T08:45:18Z 2018-11-02T08:45:18Z 2018-10-03
dc.identifier.citation Niskala , P , Gurchenko , A D , Gusakov , E Z , Altukhov , A B , Esipov , L A , Chôné , L , Kiviniemi , T P & Leerink , S 2018 , ' Neoclassical and turbulent e × B flows in flux-driven gyrokinetic simulations of Ohmic tokamak plasmas ' Nuclear Fusion , vol 58 , no. 11 , 112006 , pp. 1-12 . DOI: 10.1088/1741-4326/aacf52 en
dc.identifier.issn 0029-5515
dc.identifier.issn 1741-4326
dc.identifier.other PURE UUID: ef0cceef-58a6-428f-a1cb-f52e04482ec7
dc.identifier.other PURE ITEMURL:
dc.identifier.other PURE LINK:
dc.description | openaire: EC/H2020/633053/EU//EUROfusion
dc.description.abstract The interplay of flows and turbulence in Ohmic FT-2 tokamak plasmas is analysed via gyrokinetic simulations with the flux-driven ELMFIRE code. The simulation predictions agree qualitatively with analytical estimates for the scaling of the neoclassical radial electric field as a function of collisionality for ad hoc parameters. For the experimental parameters, the global full-f modeling agrees well with the analytical estimates in a neoclassical setting, while including kinetic electrons and impurities has a small impact. Allowing turbulence to develop modifies the flow profile through relaxation of profiles caused by turbulent transport, non-adiabatic response of passing electrons around rational surfaces, and turbulent flow drive. Geodesic acoustic mode (GAM) is the main zonal flow component in the simulations, and its frequency and amplitude agree with theoretical predictions and experimental measurements. In the simulations, the non-linear energy transfer from the turbulence to the flows through the Reynolds force is balanced by the collisional flow dissipation. Temporal relationship between the oscillating flow, Reynolds force, and turbulent particle flux is consistent with the fundamental physics picture of GAM modulating turbulent transport on the time scale of the mode. Experimental evidence also suggests anti-correlation of GAM amplitude and turbulent fluctuations. en
dc.format.extent 1-12
dc.language.iso en en
dc.relation info:eu-repo/grantAgreement/EC/H2020/633053/EU//EUROfusion
dc.relation.ispartofseries Nuclear Fusion en
dc.relation.ispartofseries Volume 58, issue 11 en
dc.rights restrictedAccess en
dc.subject.other Nuclear and High Energy Physics en
dc.subject.other Condensed Matter Physics en
dc.subject.other 114 Physical sciences en
dc.title Neoclassical and turbulent e × B flows in flux-driven gyrokinetic simulations of Ohmic tokamak plasmas en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Fusion and Plasma Physics
dc.contributor.department Ioffe Institute
dc.contributor.department Department of Applied Physics
dc.subject.keyword geodesic acoustic mode
dc.subject.keyword gyrokinetic
dc.subject.keyword plasma turbulence
dc.subject.keyword simulation
dc.subject.keyword tokamak
dc.subject.keyword zonal flows
dc.subject.keyword Nuclear and High Energy Physics
dc.subject.keyword Condensed Matter Physics
dc.subject.keyword 114 Physical sciences
dc.identifier.urn URN:NBN:fi:aalto-201811025597
dc.identifier.doi 10.1088/1741-4326/aacf52

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