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dc.contributor.advisorGarcia, Odd Erik
dc.contributor.advisorTheodorsen, Audun
dc.contributor.advisorLosada, Juan Manuel
dc.contributor.authorPaikina, Olga
dc.date.accessioned2022-06-15T09:41:37Z
dc.date.available2022-06-15T09:41:37Z
dc.date.issued2022-05-15
dc.description.abstract<p>The boundary region of magnetically confined plasmas is well known to have inherently fluctuating parameters. Advances in experimental measurements and numerical computations have revealed that the fluctuation-driven transport of particles and heat across the magnetic field lines is mainly dominated by the radial motion of blob-like filament structures. These structures, which are localized in the drift plane perpendicular to the magnetic field and elongated along the field lines, can deposit intermittent loads on the first wall of the fusion reactor leading to destructive plasma- wall interactions. As such, an accurate description of all the statistical properties of the intermittent fluctuations is necessary for both understanding and predicting its causes and effects on the reactor and walls. <p>Recently, a stochastic model for intermittent fluctuations has been constructed based on a super-position of uncorrelated pulses moving in the radial direction with a random distribution of amplitudes, sizes and velocities. Numerical simulations of this model are utilized to investigate the implication of distribution and correlation between pulse sizes, velocities and amplitudes. The statistical analysis presented in this thesis includes lower-order statistical moments, probability density functions, auto-correlation functions and power spectral densities. <p>The results explain the mechanisms behind broad and flat time-average radial profiles of particle density in the scrape-off layer, the increase of the relative fluctuation amplitude as well as skewness and flatness in the far scrape-off layer. This proves valuable for describing intermittent fluctuations in the boundary region of magnetized plasmas.en_US
dc.identifier.urihttps://hdl.handle.net/10037/25478
dc.language.isoengen_US
dc.publisherUiT Norges arktiske universiteten_US
dc.publisherUiT The Arctic University of Norwayen_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2022 The Author(s)
dc.rights.urihttps://creativecommons.org/licenses/by-nc-sa/4.0en_US
dc.rightsAttribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)en_US
dc.subject.courseIDFYS-3900
dc.subjectVDP::Mathematics and natural science: 400::Mathematics: 410::Applied mathematics: 413en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Matematikk: 410::Anvendt matematikk: 413en_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.subjectVDP::Mathematics and natural science: 400::Mathematics: 410::Statistics: 412en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Matematikk: 410::Statistikk: 412en_US
dc.titleStochastic Modelling and Numerical Simulations of Radial Filament Motion and Average Profiles at the Boundary of Fusion Plasmasen_US
dc.typeMaster thesisen_US
dc.typeMastergradsoppgaveen_US


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Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)