BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:2
UID:UW-Physics-Event-4926
DTSTART:20181022T170500Z
DURATION:PT1H0M0S
DTSTAMP:20260419T055048Z
LAST-MODIFIED:20181010T164826Z
LOCATION:2241 Chamberlin Hall
SUMMARY:Dalton Schnack Memorial Lecture: Three-dimensional Coherent Pl
 asmoids in  Current-Carrying Plasmas\, Plasma Physics (Physics/ECE/NE 
 922) Seminar\, Dr. Fatima Ebrahimi\, Princeton Plasma Physics Lab
DESCRIPTION:Generation of coherent\, current-carrying structures is pr
 evalent in 
\nmagnetically-dominated\, rotating astrophysical and labo
 ratory plasmas. 
\nIntertwining flux tubes\, as well as sheet-like str
 uctures\, emerging from 
\nthe surface of the sun\,  and edge-localize
 d filament structures in 
\nmagnetically confined plasmas are examples
  of such current-carrying 
\nstructures. In this talk\, using three-di
 mensional simulations\, I 
\ndemonstrate the onset and nonlinear evolu
 tion of coherent 
\ncurrent-carrying filaments\, as well as round magn
 etic structures (so 
\ncalled plasmoids)\, in a global toroidal geomet
 ry.  The role of magnetic 
\nreconnection\,  the rearrangement of the 
 magnetic field topology\, as  a 
\nmajor underlying mechanism for the 
 fast growth  and nonlinear saturation 
\nof the localized current-carr
 ying structures will be explained. It will 
\nbe shown that 3-D magnet
 ic fluctuations can cause either local flux 
\namplification to trigge
 r axisymmetric reconnecting plasmoids formation 
\nat the reconnection
  site or cause the local annihilation of axisymmetric 
\ncurrent throu
 gh a fluctuation-induced\, bi-directional dynamo term.  The 
\ninstrum
 ental role of magnetic reconnection\, which enables an innovative 
\nt
 echnique for producing current in fusion plasmas\, will be discussed.<
 br>
\n<br>
\nSupported in part by a generous grant from the Women in S
 cience & 
\nEngineering Leadership Institute (WISELI)
URL:https://www.physics.wisc.edu/events/?id=4926
END:VEVENT
END:VCALENDAR