BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-4273
DTSTART:20160926T170000Z
DTEND:20160926T180000Z
DTSTAMP:20260419T075924Z
LAST-MODIFIED:20160908T202703Z
LOCATION:2241 Chamberlin Hall
SUMMARY:Turbulent Dynamo Amplification of Magnetic Fields in Laser-Pro
 duced Plasmas\, Plasma Physics (Physics/ECE/NE 922) Seminar\, Petros T
 zeferacos\, University of Chicago
DESCRIPTION:Magnetic fields are ubiquitous in the Universe\, as reveal
 ed by diffuse radio-synchrotron emission and Faraday rotation observat
 ions\, with strengths from a few nG to tens of μG. The energy density
  of these fields is typically comparable to the energy density of the 
 fluid motions of the plasma in which they are embedded\, making magnet
 ic fields essential players in the dynamics of the luminous matter in 
 the Universe. The standard model for the origin of these intergalactic
  magnetic fields is through the amplification of seed fields via turbu
 lent dynamo to the level consistent with current observations. We have
  conceived and conducted a series of experiments using high-power lase
 r facilities to study the amplification of magnetic fields via turbule
 nce. In these experiments\, we characterize the properties of the flui
 d and the magnetic field turbulence using a comprehensive suite of pla
 sma and magnetic field diagnostics. We describe the large-scale 3D sim
 ulations we performed with the radiation-MHD code FLASH on ANL's Mira 
 to help design and interpret the experiments. We then discuss the resu
 lts of the experiments\, which indicate magnetic Reynolds numbers abov
 e the expected dynamo threshold are achieved and seed magnetic fields 
 produced by the Biermann battery mechanism are amplified by turbulent 
 dynamo. We relate our findings to processes occurring in galaxy cluste
 rs.
URL:https://www.physics.wisc.edu/events/?id=4273
END:VEVENT
END:VCALENDAR