Details

Autor(en) / Beteiligte

• Barnes, M.
• Abel, I. G.
• Dorland, W.
• Ernst, D. R.
• Hammett, G. W.
• Ricci, P.
• Rogers, B. N.
• Schekochihin, A. A.
• Tatsuno, T.

Titel

Linearized model Fokker–Planck collision operators for gyrokinetic simulations. II. Numerical implementation and tests

Ist Teil von

• Physics of plasmas, 2009-07, Vol.16 (7), p.072107-072107-13

Ort / Verlag

United States: American Institute of Physics

Erscheinungsjahr

2009

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A set of key properties for an ideal dissipation scheme in gyrokinetic simulations is proposed, and implementation of a model collision operator satisfying these properties is described. This operator is based on the exact linearized test-particle collision operator, with approximations to the field-particle terms that preserve conservation laws and an H -theorem. It includes energy diffusion, pitch-angle scattering, and finite Larmor radius effects corresponding to classical (real-space) diffusion. The numerical implementation in the continuum gyrokinetic code GS2 [Kotschenreuther et al. , Comput. Phys. Comm. 88, 128 (1995)] is fully implicit and guarantees exact satisfaction of conservation properties. Numerical results are presented showing that the correct physics is captured over the entire range of collisionalities, from the collisionless to the strongly collisional regimes, without recourse to artificial dissipation.