Full-F Turbulent Simulation in a Linear Device using a Gyro-Moment Approach
arXiv:2307.04562 · doi:10.1063/5.0167997
Abstract
Simulations of plasma turbulence in a linear plasma device configuration are presented. These simulations are based on a simplified version of the gyrokinetic (GK) model proposed by B. J. Frei et al. [J. Plasma Phys. 86, 905860205 (2020)] where the full-F distribution function is expanded on a velocity-space polynomial basis allowing us to reduce its evolution to the solution of an arbitrary number of fluid-like equations for the expansion coefficients, denoted as the gyro-moments (GM). By focusing on the electrostatic and neglecting finite Larmor radius effects, a full-F GM hierarchy equation is derived to evolve the ion dynamics, which includes a nonlinear Dougherty collision operator, localized sources, and Bohm sheath boundary conditions. An electron fluid Braginskii model is used to evolve the electron dynamics, coupled to the full-F ion GM hierarchy equation via a vorticity equation where the Boussinesq approximation is used. A set of full-F turbulent simulations are then performed using the parameters of the LArge Plasma Device (LAPD) experiments with different numbers of ion GMs and different values of collisionality. The ion distribution function is analyzed illustrating the convergence properties of the GM approach. In particular, we show that higher-order GMs are damped by collisions in the high-collisional regime relevant to LAPD experiments. The GM results are then compared with those from two-fluid Braginskii simulations, finding qualitative agreement in the time-averaged profiles and statistical turbulent properties.
References in corpus (24)
- Gyrokinetic projection of the divertor heat-flux width from present tokamaks to ITER
- Intermittent turbulence and turbulent structures in a linear magnetized plasma
- The GBS code for the self-consistent simulation of plasma turbulence and kinetic neutral dynamics in the tokamak boundary
- Validation of edge turbulence codes against the TCV-X21 diverted L-mode reference case
- Gyrokinetic continuum simulation of turbulence in a straight open-field-line plasma
- Laguerre-Hermite Pseudo-Spectral Velocity Formulation of Gyrokinetics
- Reproducibility, accuracy and performance of the Feltor code and library on parallel computer architectures
- Extensions and Applications of the Bohm Criterion
- A gyrokinetic model for the plasma periphery of tokamak devices
- The influence of temperature dynamics and dynamic finite ion Larmor radius effects on seeded high amplitude plasma blobs
- A Drift-Kinetic Analytical Model for SOL Plasma Dynamics at Arbitrary Collisionality
- Energy dynamics in a simulation of LAPD turbulence
- Nonlocal Nonlinear Electrostatic Gyrofluid Equations: A four-moment model
- Analysis of plasma instabilities and verification of the BOUT code for the Large Plasma Device
- Modeling of plasma turbulence and transport in the Large Plasma Device
- Padé-based arbitrary wavelength polarization closures for full-F gyro-kinetic and -fluid models
- Nonlinear Gyrokinetic Coulomb Collision Operator
- Gyrokinetic treatment of a grazing angle magnetic field
- Local Gyrokinetic Collisional Theory of the Ion-Temperature Gradient Mode
- Beyond the Oberbeck-Boussinesq and long wavelength approximation
- Gyrokinetic simulations of plasma turbulence in a Z-pinch using a moment based approach and advanced collision operators
- Linear Theory of Electron-Plasma Waves at Arbitrary Collisionality
- Development of Advanced Linearized Gyrokinetic Collision Operators Using a Moment Approach
- Numerical Implementation of the Improved Sugama Collision Operator Using a Moment Approach