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AuthorGörler, Tobiasdc.contributor.author
Date of accession2016-03-15T06:23:22Zdc.date.accessioned
Available in OPARU since2016-03-15T06:23:22Zdc.date.available
Year of creation2009dc.date.created
AbstractMicroinstabilities are one of the key physics problems on the way to efficient nuclear fusion power plants. They cause anomalous heat and particle transport which significantly degrades the plasma confinement, thus preventing self-sustaining plasma burning in present-day experiments. Due to their complex dynamics and highly nonlinear character, the underlying equations can only be solved numerically, and corresponding computations would not be feasible if all involved space and time scales were to be considered. However, in this context, multiscale approaches allow for a reduction to the relevant domain of interest and are used in the plasma turbulence code GENE. The latter numerically solves the gyrokinetic Vlasov-Maxwell system of equations and has been significantly extended during this thesis project by relaxing the local approximation in the radial direction. An important application of the code is the investigation of coupled microturbulence on different space and time scales which are not affected by the gyrokinetic approximation. Traditionally, much of the heat transport and thus the confinement degradation in fusion experiments is attributed to microturbulence with wavelengths of the order of the ion gyroradius. However, several recent theoretical and experimental findings indicate significant contributions originating from the considerably smaller electron gyroradius scales and hence motivate simulations covering both ion and electron spatial and temporal scales self-consistently. It is found that for realistic ion heat flux levels and in the presence of unstable electron temperature gradient driven modes, there tends to be a scale separation between electron and ion thermal transport. In contrast to the latter, the former may exhibit substantial or even dominant small-scale contributions. Furthermore, it is investigated in which way this behavior is reflected in several experimentally accessible quantities, including frequency or density spectra.dc.description.abstract
Languageendc.language.iso
PublisherUniversität Ulmdc.publisher
LicenseStandard (Fassung vom 01.10.2008)dc.rights
Link to license texthttps://oparu.uni-ulm.de/xmlui/license_v2dc.rights.uri
KeywordGyrokineticsdc.subject
KeywordPlasmaturbulenzdc.subject
Dewey Decimal GroupDDC 530 / Physicsdc.subject.ddc
LCSHNuclear fusiondc.subject.lcsh
LCSHPlasma physicsdc.subject.lcsh
LCSHPlasma turbulencedc.subject.lcsh
TitleMultiscale effects in plasma microturbulencedc.title
Resource typeDissertationdc.type
DOIhttp://dx.doi.org/10.18725/OPARU-1829dc.identifier.doi
PPN618495622dc.identifier.ppn
URNhttp://nbn-resolving.de/urn:nbn:de:bsz:289-vts-71815dc.identifier.urn
GNDKernfusiondc.subject.gnd
GNDMehrskalenmodelldc.subject.gnd
GNDPlasmaphysikdc.subject.gnd
FacultyFakultät für Naturwissenschaftenuulm.affiliationGeneral
Date of activation2010-01-28T14:43:25Zuulm.freischaltungVTS
Peer reviewneinuulm.peerReview
Shelfmark print versionZ: J-H 13.530; W: W-H 11.964uulm.shelfmark
DCMI TypeTextuulm.typeDCMI
VTS ID7181uulm.vtsID
CategoryPublikationenuulm.category
Bibliographyuulmuulm.bibliographie


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