A multi-species collisional operator for full-F global gyrokinetics codes : Numerical aspects and validation with the GYSELA code

Peter Donnel (1) , Xavier Garbet (1) , Yanick Sarazin (1) , Virginie Grandgirard (1) , Yuuichi Asahi (1) , Nicolas Bouzat (2) , Elisabetta Caschera (1) , Guilhem Dif-Pradalier (1) , Charles Ehrlacher (1) , Philippe Ghendrih (1) , Guillaume Latu (1) , Chantal Passeron (1)

1 IRFM - Institut de Recherche sur la Fusion par confinement Magnétique
2 TONUS - TOkamaks and NUmerical Simulations

A linearized multi-species collision operator valid for arbitrary masses and charges has been developed and implemented in the gyrokinetic code GYSELA [9]. This operator has all the required properties : it conserves particles, total momentum and energy, fulfills the Boltzmann H theorem and recovers neoclassical results. This operator takes into account both pitch angle scattering and energy diffusion while operting in the v , µ phase space. Derivatives with respect to the magnetic moment are treated using a projection on a set of orthogonal polynomials. The numerical aspects of the implementation are detailed and a set of physical benchmarks allows a verification of the properties of the operator.

Mots clés: collision; multispecies; H-theorem; neoclassic

Domaines: Physique des plasmas [physics.plasm-ph]; Physique Numérique [physics.comp-ph]

Peter Donnel, Xavier Garbet, Yanick Sarazin, Virginie Grandgirard, Yuuichi Asahi, et al.. A multi-species collisional operator for full-F global gyrokinetics codes : Numerical aspects and validation with the GYSELA code. 2018. ⟨hal-01687586⟩