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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-4994
DTSTART:20190204T180500Z
DURATION:PT1H0M0S
DTSTAMP:20260419T084808Z
LAST-MODIFIED:20190109T150429Z
LOCATION:2241 Chamberlin Hall
SUMMARY:Available energy of magnetically confined plasmas\, Plasma Phy
 sics (Physics/ECE/NE 922) Seminar\, Per Helander\, Max Plank Institue 
 for Plasma Physics
DESCRIPTION:In this talk\, the energy budget of a collisionless plasma
  subject to electrostatic fluctuations is studied. In particular\, the
  excess of thermal energy over the minimum accessible to it under vari
 ous constraints that limit the possible forms of plasma motion is cons
 idered. This excess measures how much thermal energy is “availableâ€
 ť for conversion into plasma instabilities\, and therefore constitutes
  a nonlinear measure of plasma stability. The “available energy” d
 efined in this way becomes an interesting and useful quantity in situa
 tions where adiabatic invariants impose non-trivial constraints on the
  plasma motion. For instance\, microstability properties of certain st
 ellarators can be inferred directly from the available energy\, withou
 t the need to solve the gyrokinetic equation. The technique also sugge
 sts that an electron-positron plasma confined by a dipole magnetic fie
 ld could be entirely free from turbulence.
URL:https://www.physics.wisc.edu/events/?id=4994
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