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SUMMARY:Large-magnetic field regimes and asymptotic preserving schemes for
  plasmas in a torus configuration
DTSTART:20230223T141500
DTEND:20230223T151500
DTSTAMP:20260427T233058Z
UID:0aa51c0f31f8c61a84f9eb19769f20f419b27a13e47ce1645c8efcc9
CATEGORIES:Conferences - Seminars
DESCRIPTION:Francis Filbert (Institut de Mathématiques de Toulouse)\nEven
  in highly-oscillating dynamics may persist quantities that are evolving o
 n slower scales and\, at first-order\, uncouple from fast oscillations. Th
 us asymptotically the slow dynamics obeys a closed system of uncoupled equ
 ations\, which may be thought as averaged equations.\nThat is typically th
 e case for plasmas subject to strong magnetic fields. In this case\, the t
 ask of identifying a slow uncoupled dynamics is known as gyrokinetics. In 
 the present talk\, we shall review some contributions (mostly obtained joi
 ntly with Francis Filbet (Toulouse))\, that fill some of the gaps of the a
 nalytic theory and design numerical schemes that capture accurately the sl
 ow part of the dynamics even when discretization meshes are too coarse to 
 describe coexisting fast oscillations.\nThe emphasis will be on the case w
 here the plasma is in a torus configuration\, a toy-model for applications
  to tokamak fusion devices\, and the class of numerical schemes introduced
  fits in the range of particle-in-cell schemes\, with particle-pushers of 
 implicit-explicit type\, but are applied to a suitably augmented formulati
 on.\n 
LOCATION:GA 3 21 https://plan.epfl.ch/?room==GA%203%2021
STATUS:CONFIRMED
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