Visualization of the Vortex Lattice Dynamics in Superfluid Helium

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dc.contributor.advisorLathrop, Daniel Pen_US
dc.contributor.authorGaff, Kristina Teresaen_US
dc.contributor.departmentPhysicsen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2011-02-19T06:33:09Z
dc.date.available2011-02-19T06:33:09Z
dc.date.issued2010en_US
dc.description.abstractWe 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.urihttp://hdl.handle.net/1903/11086
dc.subject.pqcontrolledCondensed Matter Physicsen_US
dc.subject.pqcontrolledPlasma Physicsen_US
dc.subject.pqcontrolledPhysicsen_US
dc.subject.pquncontrolleddifferential rotationen_US
dc.subject.pquncontrolledheliumen_US
dc.subject.pquncontrolledlatticeen_US
dc.subject.pquncontrolledsuperfluiden_US
dc.subject.pquncontrolledTkachenkoen_US
dc.subject.pquncontrolledvortexen_US
dc.titleVisualization of the Vortex Lattice Dynamics in Superfluid Heliumen_US
dc.typeThesisen_US

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