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LOCATION:HG F 26.3
DTSTART;TZID=Europe/Stockholm:20240604T173000
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UID:submissions.pasc-conference.org_PASC24_sess117_msa201@linklings.com
SUMMARY:Accurate Sheath Boundary Conditions in Fusion Plasmas
DESCRIPTION:Minisymposium\n\nAlessandro Geraldini (EPFL)\n\nThe magnetised
  plasma sheath is a boundary layer, whose thickness is a few ion Larmor ra
 dii, appearing next to the solid targets of a fusion device. It is a multi
 -scale region, including the Debye length and electron gyroradius as addit
 ional smaller length scales. It is therefore rich in physics and complex, 
 in particular in the fusion-relevant case of grazing magnetic field incide
 nce at the target. From the point of view of the plasma, the main role of 
 the sheath is to reflect electrons such that a (globally) ambipolar flow o
 f ions and electrons to the solid target is achieved. Therefore, simplifie
 d conducting or logical sheath boundary conditions that exploit a constant
  parallel electron velocity reflection cutoff, related to an unresolved sh
 eath potential drop, have been and are being used in gyrokinetic simulatio
 ns. Yet, only actual sheath solutions can provide more accurate reflection
  conditions for electrons, as well as predict the correct plasma-surface i
 nteraction by computing the strongly distorted ion distribution function a
 t the target. We present a scheme to iteratively obtain fast numerical sol
 utions of the steady state magnetised sheath for grazing magnetic field in
 cidence. A magnetic moment dependence in the electron reflection cutoff pr
 ovides more accurate sheath boundary conditions.\n\nDomain: Physics, Compu
 tational Methods and Applied Mathematics\n\nSession Chairs: Stephan Brunne
 r (EPFL); Eric Sonnendrücker (Max Planck Institute for Plasma Physics, Tec
 hnical University of Munich); and Laurent Villard (EPFL)
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