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oai:drum.lib.umd.edu:1903/110862016-03-29T07:31:47Zcom_1903_2269com_1903_12com_1903_2col_1903_2800col_1903_3

Lathrop, Daniel P Gaff, Kristina Teresa Digital Repository at the University of Maryland University of Maryland (College Park, Md.) Physics 2011-02-19T06:33:09Z 2011-02-19T06:33:09Z 2010 http://hdl.handle.net/1903/11086 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. Visualization of the Vortex Lattice Dynamics in Superfluid Helium Thesis Condensed Matter Physics Plasma Physics Physics differential rotation helium lattice superfluid Tkachenko vortex open.access