Visualization of the Vortex Lattice Dynamics in Superfluid Helium
dc.contributor.advisor | Lathrop, Daniel P | en_US |
dc.contributor.author | Gaff, Kristina Teresa | en_US |
dc.contributor.department | Physics | en_US |
dc.contributor.publisher | Digital Repository at the University of Maryland | en_US |
dc.contributor.publisher | University of Maryland (College Park, Md.) | en_US |
dc.date.accessioned | 2011-02-19T06:33:09Z | |
dc.date.available | 2011-02-19T06:33:09Z | |
dc.date.issued | 2010 | en_US |
dc.description.abstract | We study the lattice structure and dynamics of the quantized vortices in superfluid helium-4 using a new rotating experiment. This setup includes control of the entire apparatus from the rotating frame, installation of a new EMCCD camera that allows for imaging of nanoscale tracer particles, and the development and implementation of a new isolation cell, which permits investigation into new phenomena such as differential rotation in helium-II. We have observed the vortex lattice dynamics in the (r, &phi) plane (i.e. transverse to the vortices) and present here the first real-time visualization of Tkachenko waves in helium-II from this cross section. Additionally, we present evidence of differential rotation with distinct Stewartson layer boundaries, possible Kelvin-Helmholtz instabilities, and the formation and propagation of superfluid collective vortex eddies. We show that the angular velocity is a function of radius and may be driven by the geometry of the isolation cell. We also document the observation and analysis of gravity-capillary surface waves that demonstrate an interaction between the liquid helium free surface and the bulk of the fluid. | en_US |
dc.identifier.uri | http://hdl.handle.net/1903/11086 | |
dc.subject.pqcontrolled | Condensed Matter Physics | en_US |
dc.subject.pqcontrolled | Plasma Physics | en_US |
dc.subject.pqcontrolled | Physics | en_US |
dc.subject.pquncontrolled | differential rotation | en_US |
dc.subject.pquncontrolled | helium | en_US |
dc.subject.pquncontrolled | lattice | en_US |
dc.subject.pquncontrolled | superfluid | en_US |
dc.subject.pquncontrolled | Tkachenko | en_US |
dc.subject.pquncontrolled | vortex | en_US |
dc.title | Visualization of the Vortex Lattice Dynamics in Superfluid Helium | en_US |
dc.type | Thesis | en_US |
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