Title:
Interpretation of Thermal Conductivity and Toroidal Momentum Transport in DIII-D Taking Into Account IOL and Pinch Velocity

dc.contributor.advisor Stacey, Weston M.
dc.contributor.advisor Biegalski, Steven R.
dc.contributor.author Roveto, Jonathan
dc.contributor.committeeMember Petrovic, Bojan
dc.contributor.committeeMember Kotlyar, Dan
dc.contributor.committeeMember Wilks, Theresa
dc.contributor.committeeMember Groebner, Rich
dc.contributor.committeeMember Haskey, Shaun
dc.contributor.department Mechanical Engineering
dc.date.accessioned 2022-01-14T16:10:51Z
dc.date.available 2022-01-14T16:10:51Z
dc.date.created 2021-12
dc.date.issued 2021-12-13
dc.date.submitted December 2021
dc.date.updated 2022-01-14T16:10:51Z
dc.description.abstract This work improves the methodology used to interpret the diffusive radial particle flux and the conductive radial heat flux from the experimentally inferred total radial particle and energy fluxes, respectively, to more accurately infer experimental heat conductivity and particle diffusion coefficients, respectively. The experimental radial particle, momentum, and energy fluxes are determined by phenomena other than diffusion, viscosity, and conduction, respectively. The contributions of these ``other phenomena'' must be subtracted from the ``experimental'' radial fluxes to obtain diffusive radial particle fluxes that can be used to interpret particle diffusivities and conductive radial energy fluxes, which can be used to interpret thermal conductivities. This methodology is employed to interpret particle diffusion and heat conductivity coefficients in several DIII-D shots in different confinement regimes (including QH- and SH-mode) and compare with theoretical models for particle and energy transport. This research also obtains a toroidal viscous drag and a pinch velocity using IOL-corrected radial particle fluxes, therein demonstrating the importance of non-diffusive particle transport. The effects of ion orbit loss (IOL) on the interpretation of the radial ion heat flux are significant in the edge plasma. Furthermore, correcting for convective heating and work done by the plasma on the pressure tensor is seen to in general substantially reduce the inferred radial ion conductive heat flux. Importantly, we also find that viscous heating, which is driven by asymmetries in the toroidal and poloidal rotation velocities, can be an important heat transfer mechanism that must be corrected for when inferring transport coefficients. We find that, upon correcting for these non-conductive heat transport mechanisms, some combination of neoclassical and ITG transport may be able to explain ion heat transport in the edge plasma. We also show that the particle pinch is an important driver of transport in the edge plasma. }
dc.description.degree Ph.D.
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/66131
dc.language.iso en_US
dc.publisher Georgia Institute of Technology
dc.subject plasma fusion heat transport
dc.title Interpretation of Thermal Conductivity and Toroidal Momentum Transport in DIII-D Taking Into Account IOL and Pinch Velocity
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.advisor Stacey, Weston M.
local.contributor.corporatename George W. Woodruff School of Mechanical Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication c0f53c49-e84d-46a7-b831-23770e787081
relation.isOrgUnitOfPublication c01ff908-c25f-439b-bf10-a074ed886bb7
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
thesis.degree.level Doctoral
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