75 citations · 438 across the 16 of their papers we have counts for
16 papers
Global Gyrokinetic Simulations of Electromagnetic Turbulence in STEP
Daniel Kennedy, Facundo Sheffield, Tobias Görler +6
This paper presents gradient-driven global electromagnetic gyrokinetic simulations for a conceptual burning flat-top operating point of STEP [1], STEP-EC-HD, and investigates how n…
shear suppression of microtearing based transport in spherical tokamaks
B. S. Patel, M. R. Hardman, D. Kennedy +3
Electromagnetic microtearing modes (MTMs) have been observed in many different spherical tokamak regimes. Understanding how these and other electromagnetic modes nonlinearly satura…
Suppression of temperature-gradient-driven turbulence by sheared flows in fusion plasmas
P. G. Ivanov, T. Adkins, D. Kennedy +3
Starting from the assumption that saturation of plasma turbulence driven by temperature-gradient instabilities in fusion plasmas is achieved by a local energy cascade between a lon…
A quasi-linear model of electromagnetic turbulent transport and its application to flux-driven transport predictions for STEP
M. Giacomin, D. Dickinson, W. Dorland +7
A quasi-linear reduced transport model is developed from a database of high- electromagnetic nonlinear gyrokinetic simulations performed with Spherical Tokamak for Energy Produc…
On the importance of parallel magnetic-field fluctuations for electromagnetic instabilities in STEP
D. Kennedy, C. M. Roach, M. Giacomin +8
[ABRIDGED] This paper discusses the importance of parallel perturbations of the magnetic-field in gyrokinetic simulations of electromagnetic instabilities and turbulence at mid-rad…
Electromagnetic gyrokinetic instabilities in STEP
Daniel Kennedy, Maurizio Giacomin, Francis J Casson +4
We present herein the results of a linear gyrokinetic analysis of electromagnetic microinstabilites in the conceptual high-, reactor-scale, tight-aspect-ratio tokamak STEP (Sphe…
On electromagnetic turbulence and transport in STEP
Maurizio Giacomin, Daniel Kennedy, Francis J Casson +4
In this work, we present first-of-their-kind nonlinear local gyrokinetic simulations of electromagnetic turbulence at mid-radius in the burning plasma phase of the conceptual high-…
Effect of triangularity on plasma turbulence and the SOL-width scaling in L-mode diverted tokamak configurations
Kyungtak Lim, Maurizio Giacomin, Paolo Ricci +5
The effect of triangularity on tokamak boundary plasma turbulence is investigated by using global, flux-driven, three-dimensional, two-fluid simulations. The simulations show that…
Nonlinear microtearing modes in MAST and their stochastic layer formation
M. Giacomin, D. Dickinson, D. Kennedy +2
First nonlinear gyrokinetic simulations of microtearing modes in the core of a MAST case are performed on two surfaces of the high-collisionality discharge used in Valovič et al. N…
Turbulent transport regimes in the tokamak boundary and operational limits
M. Giacomin, P. Ricci
Two-fluid, three-dimensional, flux-driven, global, electromagnetic turbulence simulations carried out by using the GBS code are used to identify the main parameters controlling tur…
First-principles density limit scaling in tokamaks based on edge turbulent transport and implications for ITER
M. Giacomin, A. Pau, P. Ricci +2
A first-principles scaling law, based on turbulent transport considerations, and a multi-machine database of density limit discharges from the ASDEX Upgrade, JET and TCV tokamaks,…
Global fluid simulation of plasma turbulence in a stellarator with an island divertor
A. J. Coelho, J. Loizu, P. Ricci +1
Results of a three-dimensional, flux-driven, electrostatic, global, two-fluid turbulence simulation for a 5-field period stellarator with an island divertor are presented. The nume…
The GBS code for the self-consistent simulation of plasma turbulence and kinetic neutral dynamics in the tokamak boundary
M. Giacomin, P. Ricci, A. Coroado +7
A new version of GBS (Ricci et al. Plasma Phys. Control. Fusion 54, 124047, 2012; Halpern et al. J. Comput. Phys. 315, 388-408, 2016; Paruta et al. Phys. Plasmas 25, 112301, 2018)…
Validation of edge turbulence codes against the TCV-X21 diverted L-mode reference case
D. S. Oliveira, T. Body, D. Galassi +27
Self-consistent full-size turbulent-transport simulations of the divertor and SOL of existing tokamaks have recently become feasible. This enables the direct comparison of turbulen…
Theory-based scaling laws of near and far scrape-off layer widths in single-null L-mode discharges
M. Giacomin, A. Stagni, P. Ricci +4
Theory-based scaling laws of the near and far scrape-off layer (SOL) widths are analytically derived for L-mode diverted tokamak discharges by using a two-fluid model. The near SOL…
Investigation of turbulent transport regimes in the tokamak edge by using two-fluid simulations
Maurizio Giacomin, Paolo Ricci
The results of flux-driven, two-fluid simulations in single-null configurations are used to investigate the processes determining the turbulent transport in the tokamak edge. Three…