Simulation of multi-pulse coaxial helicity injection in the Sustained Spheromak Physics Experiment

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dc.contributor.authorO'Brian, J. B.
dc.contributor.authorRomero-Talamas, C. A.
dc.contributor.authorWoodruff, S.
dc.date.accessioned2018-03-20T13:04:02Z
dc.date.available2018-03-20T13:04:02Z
dc.date.issued2017
dc.descriptionReproduced from O'Bryan, J. B., C. A. Romero-Talamas, and S. Woodruff. Simulation of multi-pulse coaxial helicity injection in the Sustained Spheromak Physics Experiment. Physics of Plasma 25, no. 3.en_US
dc.description.abstractNonlinear, numerical computation with the NIMROD code is used to explore magnetic self-organization during multi-pulse coaxial helicity injection in the Sustained Spheromak Physics eXperiment. We describe multiple distinct phases of spheromak evolution, starting from vacuum magnetic fields and the formation of the initial magnetic flux bubble through multiple refluxing pulses and the eventual onset of the column mode instability. Experimental and computational magnetic diagnostics agree on the onset of the column mode instability, which first occurs during the second refluxing pulse of the simulated discharge. Our computations also reproduce the injector voltage traces, despite only specifying the injector current and not explicitly modeling the external capacitor bank circuit. The computations demonstrate that global magnetic evolution is fairly robust to different transport models and, therefore, that a single fluid-temperature model is sufficient for a broader, qualitative assessment of spheromak performance. Although discharges with similar traces of normalized injector current produce similar global spheromak evolution, details of the current distribution during the column mode instability impact the relative degree of poloidal flux amplification and magnetic helicity content.en_US
dc.description.urihttps://aip.scitation.org/doi/abs/10.1063/1.5018319en_US
dc.format.extent12 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/M29C6S298
dc.identifier.citationO'Bryan, J. B., C. A. Romero-Talamas, and S. Woodruff. Simulation of multi-pulse coaxial helicity injection in the Sustained Spheromak Physics Experiment. Physics of Plasma 25, no. 3en_US
dc.identifier.urihttp://hdl.handle.net/11603/7891
dc.language.isoen_USen_US
dc.publisherAIP Publishingen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Mechanical Engineering Department Collection
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item may be protected under Title 17 of the U.S. Copyright Law. It is made available by UMBC for non-commercial research and education. For permission to publish or reproduce, please contact the author.
dc.subjectmagnetic self-organizationen_US
dc.subjectmulti-pulse coaxial helicity injectionen_US
dc.subjectSustained Spheromak Physics eXperimenten_US
dc.subjectphases of spheromak evolutionen_US
dc.subjectUMBC High Performance Computing Facility (HPCF)
dc.titleSimulation of multi-pulse coaxial helicity injection in the Sustained Spheromak Physics Experimenten_US
dc.typeTexten_US

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