An E & B Gyrokinetic Simulation Model for Kinetic Alfvén Waves inTokamak Plasmas

Abstract

The gyrokinetic particle simulation serves as a powerful tool for the studies of transport, nonlinear phenomenon, and energetic particle physics in tokamak plasmas. While most gyrokinetic simulations make use of the scalar and vector potentials, a new model (GK-E&B) has been developed by using the E and B field in a general and comprehensive form and has been implemented in simulating kinetic Alfvén waves in uniform plasma [Chen et al, Science China Phys. Mechanics & Astronomy 64 (2021)]. In our work, the Chen et al. GK-E&B model has been expressed in general tokamak geometry explicitly using specific coordinates. Its reduction to the uniform plasma is verified and the numerical results show good agreement with the work by Chen et al. The theoretical dispersion relation and numerical results in the local screw pinch model are in excellent agreement. Numerical results show excellent performance in a realistic parameter regime of burning plasmas in terms of high values of $\beta /(M_e{k}_{\perp }^2{\rho }_i^2)$, which is challenging for traditional methods due to the ``cancellation' problem. As one application, the GK-E&B model is implemented with kinetic electrons in the local limit. With the matched ITPA-TAE parameters, numerical results show the capability of the GK-E&B in treating the parallel electron Landau damping for realistic tokamak plasma parameters. As another application, the global GK-E&B model is implemented with the dominant electron contribution to $E_{\Vert }$ in the cold electron limit. Its capability in simulating the finite $E_{\Vert }$ due to the finite electron mass is demonstrated.

12 pages, 11 figures

References in corpus (6)

• The JOREK non-linear extended MHD code and applications to large-scale instabilities and their control in magnetically confined fusion plasmas
• Electron fishbones: Theory and experimental evidence
• Pullback transformation in gyrokinetic electromagnetic simulations
• Particle simulation of lower hybrid waves in tokamak plasmas
• Verification of a Fully Implicit Particle-in-Cell Method for the $v_{\parallel }$ Formalism of Electromagnetic Gyrokinetics in the XGC Code
• One dimensional reduced model for ITER relevant energetic particle transport