000229746 001__ 229746
000229746 005__ 20190812205952.0
000229746 0247_ $$2doi$$a10.1063/1.4982689
000229746 022__ $$a1070-664X
000229746 02470 $$2ISI$$a000400817900132
000229746 037__ $$aCONF
000229746 245__ $$aVerification of Gyrokinetic codes: Theoretical background and applications
000229746 260__ $$bAmer Inst Physics$$c2017$$aMelville
000229746 269__ $$a2017
000229746 300__ $$a10
000229746 336__ $$aConference Papers
000229746 520__ $$aIn fusion plasmas, the strong magnetic field allows the fast gyro-motion to be systematically removed from the description of the dynamics, resulting in a considerable model simplification and gain of computational time. Nowadays, the gyrokinetic (GK) codes play a major role in the understanding of the development and the saturation of turbulence and in the prediction of the subsequent transport. Naturally, these codes require thorough verification and validation. Here, we present a new and generic theoretical framework and specific numerical applications to test the faithfulness of the implemented models to theory and to verify the domain of applicability of existing GK codes. For a sound verification process, the underlying theoretical GK model and the numerical scheme must be considered at the same time, which has rarely been done and therefore makes this approach pioneering. At the analytical level, the main novelty consists in using advanced mathematical tools such as variational formulation of dynamics for systematization of basic GK code's equations to access the limits of their applicability. The verification of the numerical scheme is proposed via the benchmark effort. In this work, specific examples of code verification are presented for two GK codes: the multi-species electromagnetic ORB5 (PIC) and the radially global version of GENE (Eulerian). The proposed methodology can be applied to any existing GK code. We establish a hierarchy of reduced GK Vlasov-Maxwell equations implemented in the ORB5 and GENE codes using the Lagrangian variational formulation. At the computational level, detailed verifications of global electromagnetic test cases developed from the CYCLONE Base Case are considered, including a parametric beta-scan covering the transition from ITG to KBM and the spectral properties at the nominal beta value.
000229746 700__ $$uMax Planck Inst Plasma Phys, D-85748 Garching, Germany$$aTronko, Natalia
000229746 700__ $$uMax Planck Inst Plasma Phys, D-85748 Garching, Germany$$aBottino, Alberto
000229746 700__ $$uMax Planck Inst Plasma Phys, D-85748 Garching, Germany$$aGoerler, Tobias
000229746 700__ $$uMax Planck Inst Plasma Phys, D-85748 Garching, Germany$$aSonnendruecker, Eric
000229746 700__ $$uMax Planck Inst Plasma Phys, D-85748 Garching, Germany$$aTold, Daniel
000229746 700__ $$aVillard, Laurent
000229746 7112_ $$dOCT 31-NOV 04, 2016$$cSan Jose, CA$$a58th Annual Meeting of the APS-Division-of-Plasma-Physics (DPP)
000229746 773__ $$j24$$tPhysics Of Plasmas$$k5$$q056115
000229746 909C0 $$xU12272$$pSPC$$0252028$$xU10136$$xU12267$$xU12269$$xU12271$$xU10559$$xU12273$$xU10557$$xU12270$$xU10137$$xU10636$$xU12266$$xU10635$$xU10558$$xU12268
000229746 909CO $$pconf$$pSB$$ooai:infoscience.tind.io:229746
000229746 917Z8 $$x112823
000229746 937__ $$aEPFL-CONF-229746
000229746 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000229746 980__ $$aCONF