Publications de Giovanni Di Giannatale

Particle-in-cell methods in edge plasma physics: the PICLS code

Stephan Brunner, Laurent Villard, Giovanni Di Giannatale

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 significant challenges ...

2025

Collisional effects on positive and negative triangularity through local and global temperature gradient-driven and flux-driven gyrokinetic simulations

Stephan Brunner, Laurent Villard, Moahan Murugappan, Giovanni Di Giannatale

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 gradient-driven and ...

2025

Global electromagnetic gyrokinetic simulations of internal transport barriers in reversed-shear tokamaks

Stephan Brunner, Laurent Villard, Moahan Murugappan, Justin Richard Ball, Arnas Volcokas, Giovanni Di Giannatale

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 an ITB, using a m ...

2025

Ion temperature gradient mode mitigation by energetic particles, mediated by forced-driven zonal flows

Laurent Villard, Giovanni Di Giannatale, Baruch Rofman

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 temperature gradien ...

American Institute of Physics (AIP)2024

Gyrokinetic flux-driven simulations in mixed TEM/ITG regime using a delta-f PIC scheme with evolving background

Stephan Brunner, Laurent Villard, Moahan Murugappan, Giovanni Di Giannatale

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 corresponding to given ...

American Institute of Physics (AIP)2024

An asymptotic-preserving semi-Lagrangian algorithm for the anisotropic heat transport equation with arbitrary magnetic fields

Giovanni Di Giannatale

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 showed remarkable num ...

2024

System size scaling of triangularity effects on global temperature gradient-driven gyrokinetic simulations

Stephan Brunner, Laurent Villard, Moahan Murugappan, Giovanni Di Giannatale

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 DIII-D machine, h ...

2024

Experimental and numerical investigations of electron transport enhancement by electron-cyclotron plasma-wave interaction in tokamaks

Laurent Villard, Stefano Coda, Laurie Porte, Joan Decker, Aylwin Iantchenko, Jean Arthur Cazabonne, Giovanni Di Giannatale

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 deposition with a ...

IOP Publishing Ltd2023