Investigation of non-ideal effects in wave-heated dense microplasmas using particle-in-cell Monte Carlo-collision modeling

dc.contributor.advisorRaja, Laxminarayan L.
dc.contributor.committeeMemberHallock, Gary A.
dc.contributor.committeeMemberVarghese, Philip L.
dc.contributor.committeeMemberGoldstein, David B.
dc.contributor.committeeMemberUnderwood, Thomas C.
dc.creatorSolmaz, Evrim
dc.creator.orcid0000-0002-1183-0881
dc.date.accessioned2022-10-04T01:13:27Z
dc.date.available2022-10-04T01:13:27Z
dc.date.created2022-05
dc.date.issued2022-05-09
dc.date.submittedMay 2022
dc.date.updated2022-10-04T01:13:28Z
dc.description.abstractRecent experiments observing the development of extreme-density plasmas led to a more careful and detailed look at assumptions made for low-density plasmas. As plasma approaches the warm dense matter regime, the physics change significantly, which necessitates novel computational methods that relax some preliminary assumptions made for low-density plasmas. One such example is the ideal plasma approximation, which is not adequately accurate at high pressures. In this dissertation, the development of a particle-in-cell Monte Carlo-collision (PIC-MCC) computational model for strongly ionized non-ideal plasmas is presented. The model is established to investigate the interaction of electromagnetic waves and dense plasmas at high pressures, and study the second-stage wave-heating that results from this interaction. The main focus is on establishing a valid plasma chemistry for extreme-density, non-ideal, strongly ionized plasmas; which differs drastically from established chemistry mechanisms for low-density plasmas. Plasma non-ideality resulting from Coulomb coupling at high plasma densities is manifested as a depression in the effective ionization potential of atoms and enhanced collision cross sections. Using a one-dimensional PIC-MCC model, full ionization of the plasma is found to occur on the picosecond timescale, with the plasma non-ideality resulting in more rapid ionization compared to an ideal plasma, especially at higher pressures. Moreover, the significance of excited states is reflected in the ionization process with a stepwise ionization reaction. This additional pathway is revealed as a very important mechanism for plasma generation that speeds up the process to reach full ionization. Next, the one-dimensional PIC-MCC model is parallelized using the shared-memory parallelization library OpenMP to increase the code performance by decreasing the run time by ~60%. Finally, the one-dimensional model is extended to two dimensions to capture geometrically more complicated discharges and their interactions with generalized electromagnetic waves.
dc.description.departmentAerospace Engineering
dc.format.mimetypeapplication/pdf
dc.identifier.urihttps://hdl.handle.net/2152/116097
dc.identifier.urihttp://dx.doi.org/10.26153/tsw/42993
dc.language.isoen
dc.subjectPlasma
dc.subjectWarm dense matter
dc.subjectComputational model
dc.subjectPIC-MCC
dc.subjectPlasma physics
dc.subjectSimulation
dc.subjectPlasmas
dc.titleInvestigation of non-ideal effects in wave-heated dense microplasmas using particle-in-cell Monte Carlo-collision modeling
dc.typeThesis
dc.type.materialtext
thesis.degree.departmentAerospace Engineering
thesis.degree.disciplineAerospace Engineering
thesis.degree.grantorThe University of Texas at Austin
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy

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