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DTSTAMP:20190719T085744Z
LOCATION:HG E 1.1
DTSTART;TZID=Europe/Stockholm:20190613T174500
DTEND;TZID=Europe/Stockholm:20190613T181500
UID:submissions.pasc-conference.org_PASC19_sess141_msa146@linklings.com
SUMMARY:A Moment‐Based Kinetic Model for Efficient Numerical Impleme
 ntation
DESCRIPTION:Minisymposium\nPhysics\n\nA Moment‐Based Kinetic Model f
 or Efficient Numerical Implementation\n\nJorge, Frei, Ricci, Loureiro\n\nA
  drift-kinetic and a gyrokinetic model able to describe the plasma dy
 namics in the tokamak periphery are presented, which take into accoun
 t electromagnetic fluctuations at all relevant scales, allowing for c
 omparable amplitudes of background and fluctuating components. In addition
 , the models implement a full Coulomb collision operator, and are therefor
 e valid at arbitrary collisionality regimes. For an efficient numerical im
 plementation of the models, the resulting kinetic equations are projected 
 onto a Hermite-Laguerre velocity-space polynomial basis, obtaining a momen
 t-hierarchy. The treatment of arbitrary collisionalities is performed by e
 xpressing the full Coulomb collision operator in guiding-center and gyroce
 ntre coordinates, and by providing a closed formula for its gyroaverage in
  terms of the moments of the plasma distribution function, therefore filli
 ng a long standing gap in the literature. The use of systematic closures t
 o truncate the moment-hierarchy equation, such as the semi-collisional clo
 sure, allows for the straightforward adjustment of the kinetic physics con
 tent of the model. The first numerical studies based on our models are car
 ried out, shedding light on the interplay between collisional, using the C
 oulomb collision operator, and collisionless mechanisms.
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