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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-8624
DTSTART:20240219T180000Z
DTEND:20240219T191500Z
DTSTAMP:20260413T223458Z
LAST-MODIFIED:20240212T133517Z
LOCATION:1227 Engineering Hall
SUMMARY:"Coherent structures in non-neutral electron plasmas\, 2D flui
 ds\, and beyond"\, Plasma Physics (Physics/ECE/NE 922) Seminar\, Noah 
 Hurst\, WiPPL\, UW-Madison Physics Department
DESCRIPTION:The self-organization of fluids and plasmas into coherent 
 structures has important consequences for their dynamics and transport
 \, particularly with regard to fusion plasmas and geophysical fluids. 
 Dedicated efforts to understand the life-cycle of these structures are
  needed\, including their formation\, dynamics\, and stability. Discus
 sed here are a series of experiments with non-neutral pure electron pl
 asmas that follow an interesting trajectory from antimatter technology
  to studies of coherent vortices in two-dimensional (2D) fluids. The a
 pparatus used for electron plasma vortex dynamics relies on an isomorp
 hism between the plasma ExB drift motion and the 2D ideal fluid equati
 ons. The vortices are subjected to external flows to investigate their
  dynamics and stability\, thus recreating in a controlled environment 
 the conditions they might experience in the wild. Experiments are pres
 ented regarding vortex oscillations due to applied strain flows\, adia
 batic vortex behavior in time-dependent strain\, spatial Landau dampin
 g of vortex modes\, the Kelvin-Helmholtz instability within a backgrou
 nd strain flow\, and the splitting of initially elliptical vortices in
 to multiple pieces. The experimental results are compared to particle-
 in-cell simulations and simple theoretical models when possible. Final
 ly\, opportunities for future work are described involving vortex dyna
 mics\, other types of coherent structures in plasmas and fluids\, and 
 non-neutral plasma physics.
URL:https://www.physics.wisc.edu/events/?id=8624
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