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AuthorDoerk, Haukedc.contributor.author
Date of accession2016-03-15T09:04:52Zdc.date.accessioned
Available in OPARU since2016-03-15T09:04:52Zdc.date.available
Year of creation2013dc.date.created
AbstractIn modern fusion experiments, plasma turbulence is responsible for the radial heat transport and thus determines the plasma confinement within the magnetic field of tokamak devices. Deeper theoretical understanding is still needed and the detailed physical picture continues to evolve. In the context of electron thermal transport, early analytical work indicates a role of magnetic perturbations due to the microtearing instability, which is supported by more recent numerical results. In this thesis, the linear properties of this microtearing instability and its nonlinear, turbulent behavior is investigated by means of numerical simulations with the gyrokinetic turbulence code GENE. The underlying gyrokinetic equations are also suited to describe neoclassical transport, which is very sensitive to collisions. Since collisions are of special importance for the results presented in this thesis, successful benchmarks of neoclassical results between GENE and other well-established codes are presented. Despite their extremely challenging inherent multiscale features, nonlinear microtearing simulations succeeded for the first time in the course of this work. Realistic parameter ranges for present-day and future experiments are covered. An outstanding feature is that the radial transport of (electron) heat is well described by a simple diffusivity model, as long as the magnetic field fluctuations exceed a certain threshold. Since the resulting transport level is found to be experimentally relevant, these simulations establish microtearing turbulence as an additional candidate to explain enhanced electron thermal transport in standard tokamaks.dc.description.abstract
Languageendc.language.iso
PublisherUniversität Ulmdc.publisher
LicenseStandarddc.rights
Link to license texthttps://oparu.uni-ulm.de/xmlui/license_v3dc.rights.uri
KeywordGENE-Codedc.subject
KeywordGyrokinetic simulationdc.subject
KeywordMicrotearingdc.subject
Dewey Decimal GroupDDC 530 / Physicsdc.subject.ddc
LCSHPlasma turbulencedc.subject.lcsh
TitleGyrokinetic simulation of microtearing turbulencedc.title
Resource typeDissertationdc.type
DOIhttp://dx.doi.org/10.18725/OPARU-2600dc.identifier.doi
PPN1651991243dc.identifier.ppn
URNhttp://nbn-resolving.de/urn:nbn:de:bsz:289-vts-83370dc.identifier.urn
GNDPlasmadc.subject.gnd
GNDTokamakdc.subject.gnd
FacultyFakultät für Naturwissenschaftenuulm.affiliationGeneral
Date of activation2013-01-28T10:38:42Zuulm.freischaltungVTS
Peer reviewneinuulm.peerReview
Shelfmark print versionW: W-H 13.173uulm.shelfmark
DCMI TypeTextuulm.typeDCMI
VTS ID8337uulm.vtsID
CategoryPublikationenuulm.category
Bibliographyuulmuulm.bibliographie


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