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dc.contributor.advisorGarcia, Odd Erik
dc.contributor.authorRønningen, Petter
dc.date.accessioned2010-07-16T07:12:35Z
dc.date.available2010-07-16T07:12:35Z
dc.date.issued2010-05-18
dc.description.abstractInterchange driven propagation of so-called "blobs" arises in basic laboratory plasmas, in the scrape-off layer of fusion plasmas and as Equatorial Spread-F (ESF) phenomena. The propagation of such blobs has been demonstrated in the VTF experiment at MIT and in earlier simulations. Experimental results show that the velocity of these blobs is inverse proportional to the neutral gas pressure. These blobs have also shown the tendency to form mushroom-like shapes. We here develop a two-field model for the interchange mechanism in magnetised plasma in toroidal chambers. This model is then used to simulate the dynamics of propagating blobs using a two dimensional advection-diffusion solver. Studying the effects of ion-neutral collisions and blob amplitudes, we observe the separation between an inertia dominated and one collisionally dominated regime. We also observe that this separation persists for all simulated amplitudes. We further perform simulations with parameters set to closely resemble the VTF experiments. These simulations show that the experimental result of the velocity being inversely proportional to the neutral gas pressure is in a qualitative match with the simulated results for the collisionally dominant regime.en
dc.format.extent1391553 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttps://hdl.handle.net/10037/2579
dc.identifier.urnURN:NBN:no-uit_munin_2326
dc.language.isoengen
dc.publisherUniversitetet i Tromsøen
dc.publisherUniversity of Tromsøen
dc.rights.accessRightsopenAccess
dc.rights.holderCopyright 2010 The Author(s)
dc.rights.urihttps://creativecommons.org/licenses/by-nc-sa/3.0en_US
dc.rightsAttribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0)en_US
dc.subject.courseIDFYS-3900nor
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430::Rom- og plasmafysikk: 437en
dc.subjectVDP::Mathematics and natural science: 400::Physics: 430::Space and plasma physics: 437en
dc.titleSimulations of plasma filament dynamics in toroidal geometryen
dc.typeMaster thesisen
dc.typeMastergradsoppgaveen


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Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0)
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0)