Giovanni Di Giannatale
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View article: Collisional effects on positive and negative triangularity through local and global temperature gradient-driven and flux-driven gyrokinetic simulations
Collisional effects on positive and negative triangularity through local and global temperature gradient-driven and flux-driven gyrokinetic simulations Open
In this work, we explore the effects of collisions on turbulent transport, focusing on two different TCV magnetic equilibria featuring positive and negative triangularity. The investigation is conducted using gyrokinetic modeling. Both gra…
View article: Global electromagnetic gyrokinetic simulations of internal transport barriers in reversed-shear tokamaks
Global electromagnetic gyrokinetic simulations of internal transport barriers in reversed-shear tokamaks Open
Internal transport barriers (ITB) form through turbulence suppression, often observed when the safety factor profile exhibits an off-axis minimum. This work aims at improving our understanding of the conditions enabling the development of …
View article: Turbulence-Generated Stepped Safety Factor Profiles in Tokamaks with Low Magnetic Shear
Turbulence-Generated Stepped Safety Factor Profiles in Tokamaks with Low Magnetic Shear Open
Nonlinear local and global gyrokinetic simulations of tokamak plasmas demonstrate that turbulence-generated currents flatten the safety factor profile near low-order rational surfaces when magnetic shear is low, even when the plasma $β$ is…
View article: Particle-in-cell methods in edge plasma physics: the PICLS code
Particle-in-cell methods in edge plasma physics: the PICLS code Open
Over the past decades, multiple gyrokinetic codes have shown to be able to simulate turbulence and associated transport in the core of Tokamak devices. However, their application to the edge and scrape-off layer (SOL) region presents signi…
View article: Global electromagnetic gyrokinetic simulations of internal transport\n barriers in reversed-shear tokamaks
Global electromagnetic gyrokinetic simulations of internal transport\n barriers in reversed-shear tokamaks Open
This work aims at improving our understanding of the conditions enabling the\ndevelopment of an Internal transport barriers (ITB), using a more comprehensive\nphysical model, including low-$\\beta$ electromagnetic flux-driven simulations.\…
View article: Particle-in-cell methods in edge plasma physics: the PICLS code
Particle-in-cell methods in edge plasma physics: the PICLS code Open
Over the past decades, multiple gyrokinetic codes have shown to be able to simulate turbulence and associated transport in the core of Tokamak devices. However, their application to the edge and scrape-off layer (SOL) region presents signi…
View article: Turbulence-Induced Safety Factor Profile Flattening at Rational Surfaces in Tokamaks with Low Magnetic Shear
Turbulence-Induced Safety Factor Profile Flattening at Rational Surfaces in Tokamaks with Low Magnetic Shear Open
In this paper, we investigate the effects of ion-scale turbulence-generated currents on the local safety factor profile under conditions of low magnetic shear and proximity to rational surfaces, relevant to Internal Transport Barrier (ITB)…
View article: Gyrokinetic flux-driven simulations in mixed TEM/ITG regime using a delta-f PIC scheme with evolving background
Gyrokinetic flux-driven simulations in mixed TEM/ITG regime using a delta-f PIC scheme with evolving background Open
In the context of global gyrokinetic simulations of turbulence using a particle-in-cell framework, verifying the delta-f assumption with a fixed background distribution becomes challenging when determining quasi-steady state profiles corre…
View article: Ion temperature gradient mode mitigation by energetic particles, mediated by forced-driven zonal flows
Ion temperature gradient mode mitigation by energetic particles, mediated by forced-driven zonal flows Open
In this work, we use the global electromagnetic and electrostatic gyro kinetic approaches to investigate the effects of zonal flows forced-driven by Alfvén modes due to their excitation by energetic particles on the dynamics of ITG (ion te…
View article: An asymptotic-preserving semi-Lagrangian algorithm for the anisotropic heat transport equation with arbitrary magnetic fields
An asymptotic-preserving semi-Lagrangian algorithm for the anisotropic heat transport equation with arbitrary magnetic fields Open
View article: An asymptotic-preserving semi-Lagrangian algorithm for the anisotropic heat transport equation with arbitrary magnetic fields
An asymptotic-preserving semi-Lagrangian algorithm for the anisotropic heat transport equation with arbitrary magnetic fields Open
We extend the recently proposed semi-Lagrangian algorithm for the extremely anisotropic heat transport equation [Chacón et al., J. Comput. Phys., 272 (2014)] to deal with arbitrary magnetic field topologies. The original scheme (which show…
View article: System size scaling of triangularity effects on global temperature gradient-driven gyrokinetic simulations
System size scaling of triangularity effects on global temperature gradient-driven gyrokinetic simulations Open
In this work, we explore the triangularity effects on turbulent transport employing global gyrokinetic simulations performed with the ORB5 code. Numerous experiments on the Tokamak á Configuration Variable (TCV) and, more recently, on the …
View article: Gyrokinetic flux-driven simulations in mixed TEM/ITG regime using a delta-f PIC scheme with evolving background
Gyrokinetic flux-driven simulations in mixed TEM/ITG regime using a delta-f PIC scheme with evolving background Open
In the context of global gyrokinetic simulations of turbulence using a Particle-In-Cell framework, verifying the delta-f assumption with a fixed background distribution becomes challenging when determining quasi-steady state profiles corre…
View article: Ion temperature gradient mode mitigation by energetic particles, mediated by forced-driven zonal flows
Ion temperature gradient mode mitigation by energetic particles, mediated by forced-driven zonal flows Open
In this work, we use the global electromagnetic and electrostatic gyro kinetic approaches to investigate the effects of zonal flows forced-driven by Alfvén modes due to their excitation by energetic particles (EPs), on the dynamics of ITG …
View article: Experimental and numerical investigations of electron transport enhancement by electron-cyclotron plasma-wave interaction in tokamaks
Experimental and numerical investigations of electron transport enhancement by electron-cyclotron plasma-wave interaction in tokamaks Open
Energy transfer from electron-cyclotron (EC) waves to the plasma is being routinely used in tokamaks to heat and drive current through the electron channel. Technical applications such as magnetohydrodynamic mode mitigation require power d…
View article: Triangularity effects on global flux-driven gyrokinetic simulations
Triangularity effects on global flux-driven gyrokinetic simulations Open
On the road to fusion energy production, many alternative scenarios have been investigated in order to address certain well-known problems of tokamak devices; among which, anomalous transport, ELMs and disruptions. The studies on plasma sh…
View article: Prediction of temperature barriers in weakly collisional plasmas by a Lagrangian coherent structures computational tool
Prediction of temperature barriers in weakly collisional plasmas by a Lagrangian coherent structures computational tool Open
Analysis of Lagrangian Coherent Structures (LCSs) has been showed to be a valid mathematical approach to explain the formation of transport barriers in magnetized plasmas. Such LCSs, borrowed from fluid dynamics theory, can be considered a…
View article: Helical magnetic self-organization of plasmas in toroidal pinches with transport barriers formation
Helical magnetic self-organization of plasmas in toroidal pinches with transport barriers formation Open
Nonlinear MHD modeling of toroidal pinch configurations for hot plasma magnetic confinement describes several features of the helical self-organization process, which is observed in both reversed-field pinches and tokamaks. It can also giv…
View article: Lagrangian Coherent Structures as a new frame to investigate the particle transport in highly chaotic magnetic systems
Lagrangian Coherent Structures as a new frame to investigate the particle transport in highly chaotic magnetic systems Open
The concept of Lagrangian Coherent Structures (LCS) is here applied to investigate in a new perspective the particles transport in chaotic magnetic configurations. A paradigmatic and simplified magnetic configuration is revisited before ex…
View article: Coherent transport structures in magnetized plasmas. I. Theory
Coherent transport structures in magnetized plasmas. I. Theory Open
In a pair of linked articles (called Papers I and II, respectively), we apply the concept of Lagrangian Coherent Structures (LCSs) borrowed from the study of dynamical systems to magnetic field configurations in order to separate regions w…