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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:4
UID:UW-Physics-Event-9183
DTSTART:20250414T170000Z
DTEND:20250414T181500Z
DTSTAMP:20260413T151417Z
LAST-MODIFIED:20250408T191246Z
LOCATION:1227 Engineering Hall
SUMMARY:"A Ritz variational principle for local collisionless gyrokine
 tic instabilities"\, Plasma Physics (Physics/ECE/NE 922) Seminar\, Col
 e Stephen\, University of Texas at Austin
DESCRIPTION:Turbulence driven by gyrokinetic instabilities is largely 
 responsible for transport in magnetic fusion devices. To estimate this
  turbulent transport\, integrated modeling codes often use mixing leng
 th estimates in conjunction with reduced models of the linearized gyro
 kinetic equation. One common method of formulating and solving the lin
 earized gyrokinetic eigenvalue problem equation uses a Ritz variationa
 l principle\, particularly in the local collisionless limit. However\,
  the variational principle as typically stated in the literature is ma
 thematically incorrect. In this work\, we derive a mathematically corr
 ect form of the variational principle that applies to local linear col
 lisionless gyrokinetics in general geometry with electromagnetic effec
 ts. We also explicitly derive a weak form of the gyrokinetic field equ
 ations suitable for numerical applications.
URL:https://www.physics.wisc.edu/events/?id=9183
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