38 citations · 131 across the 12 of their papers we have counts for
15 papers
Turbulent Origin of the Edge Radial Electric Field Asymmetry between Favourable and Unfavourable Drift Configurations
B. J. Frei, R. Bilato, W. Zholobenko +9
We study the influence of the ion magnetic-drift direction relative to the active X-point (favourable and unfavourable configurations) on edge turbulence, transport, and the radial…
PQLS: A Quasilinear Gyrokinetic Transport Solver with a Bayesian Saturation-Rule Closure
F. Wilms, A. Agrawal, J. J. Freigang +3
Quasilinear models make gyrokinetic turbulent-transport predictions sufficiently fast for integrated modelling, but their predictive capability is limited by two factors: the physi…
Pre L-H Transition Radial Electric Field and Transport Validations of Edge and Scrape-off Layer Gyrokinetic Simulations at ASDEX Upgrade
B. J. Frei, C. Angioni, G. Lo-Cascio +5
This work presents a stepwise validation of the evolution of the radial electric field (Er) and heat transport during the pre L-H transition phase using full-f gyrokinetic simulati…
First-Principles Explanation of the Drift Configuration Dependence of the Radial Electric Field and High-Confinement Access in Tokamaks
B. J. Frei, R. Bilato, O. Grover +6
The origin of the difference in the high-confinement (H-mode) power threshold between favorable and unfavorable drift configurations in tokamaks, experimentally linked to a deeper…
Turbulence and Transport in Spectrally Accelerated full-f Gyrokinetic Simulations
B. J. Frei, P. Ulbl, C. Pitzal +2
We investigate edge and scrape-off layer (SOL) turbulence and transport using the spectrally accelerated full-f gyrokinetic (GK) code GENE-X, recently introduced in [B. J. Frei et…
Spectrally Accelerated Edge and Scrape-Off Layer Gyrokinetic Turbulence Simulations
B. J. Frei, P. Ulbl, J. Trilaksono +1
This paper presents the first gyrokinetic (GK) simulations of edge and scrape-off layer (SOL) turbulence accelerated by a velocity-space spectral approach in the full-f GK code GEN…
Gyrokinetic moment-based simulations of the Dimits shift
A. C. D. Hoffmann, B. J. Frei, P. Ricci
We present a convergence study of the gyromoment (GM) approach, which is based on projecting the gyrokinetic distribution function onto a Hermite-Laguerre polynomial basis, focused…
Full-F Turbulent Simulation in a Linear Device using a Gyro-Moment Approach
B. J. Frei, J. Mencke, P. Ricci
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 b…
Moment-Based Approach to the Flux-Tube linear Gyrokinetic Model
B. J. Frei, A. C. D. Hoffmann, P. Ricci +2
This work reports on the development and numerical implementation of the linear electromagnetic gyrokinetic (GK) model in a tokamak flux-tube geometry using a moment approach based…
Gyrokinetic simulations of plasma turbulence in a Z-pinch using a moment based approach and advanced collision operators
A. C. D. Hoffmann, B. J. Frei, P. Ricci
The first nonlinear gyrokinetic simulations obtained using a moment approach based on the Hermite-Laguerre decomposition of the distribution function are presented, implementing ad…
Numerical Implementation of the Improved Sugama Collision Operator Using a Moment Approach
B. J. Frei, S. Ernst, P. Ricci
The numerical implementation of the linearized gyrokinetic (GK) and drift-kinetic (DK) improved Sugama (IS) collision operators, recently introduced by Sugama et al. [Phys. Plasmas…
Local Gyrokinetic Collisional Theory of the Ion-Temperature Gradient Mode
B. J. Frei, A. C. R. Hoffmann, P. Ricci
We present a study of the linear properties of ion temperature gradient (ITG) modes with collisions modelled by the linearized gyrokinetic (GK) Coulomb collision operator (Frei et…
Development of Advanced Linearized Gyrokinetic Collision Operators Using a Moment Approach
B. J. Frei, J. Ball, A. C. D. Hoffmann +3
The derivation and numerical implementation of a linearized version of the gyrokinetic (GK) Coulomb collision operator (Jorge R. et al., J. Plasma Phys. 85, 905850604 (2019)) and o…
Nonlinear Gyrokinetic Coulomb Collision Operator
R. Jorge, B. J. Frei, P. Ricci
A gyrokinetic Coulomb collision operator is derived, which is particularly useful to describe the plasma dynamics at the periphery region of magnetic confinement fusion devices. Th…
A gyrokinetic model for the plasma periphery of tokamak devices
B. J. Frei, R. Jorge, P. Ricci
A gyrokinetic model is presented that can properly describe strong flows, large and small amplitude electromagnetic fluctuations occurring on scale lengths ranging from the electro…