133 citations · 445 across the 25 of their papers we have counts for
26 papers
Electromagnetic pressure-gradient-driven instabilities with moderate high mode numbers in tokamak plasmas
Yann Narbutt, Ksenia Aleynikova, Matthias Borchardt +6
Pressure gradient-driven instabilities are investigated in tokamak plasmas using the global gyrokinetic code EUTERPE emphasizing the role of moderate high mode numbers. As the norm…
ORB5X: a performance-portable global electromagnetic gyrokinetic PIC code in C++/Kokkos built using Agentic AI
Mohsen Sadr, Emmanuel Lanti, Alexey Mishchenko +2
ORB5X is a C++17/Kokkos AI-assisted translation of ORB5, a global electromagnetic gyrokinetic particle-in-cell code for toroidal confined plasmas. The translation preserves the mat…
Generalized mixed variable-pullback scheme with non-ideal Ohm's law for electromagnetic gyrokinetic simulations
Zhixin Lu, Guo Meng, Roman Hatzky +3
In this work, the non-ideal Ohm's law is integrated in the mixed variable-pullback scheme for the gyrokinetic particle simulations. This scheme captures the evolution of the symple…
Gyrokinetic Electromagnetic Particle Simulations in Triangular Meshes with C1 Finite Elements
Zhixin Lu, Guo Meng, Roman Hatzky +6
The triangular mesh-based gyrokinetic scheme enables comprehensive axis-to-edge studies across the entire plasma volume. Our approach employs triangular finite elements with first-…
Nonlinear interaction of Alfvénic instabilities and turbulence via the modification of the equilibrium profiles
A. Biancalani, A. Bottino, D. Del Sarto +10
Nonlinear simulations of Alfvén modes (AM) driven by energetic particles (EP) in the presence of turbulence are performed with the gyrokinetic particle-in-cell code ORB5. The AMs c…
Gyrokinetic particle-in-cell simulations of electromagnetic turbulence in the presence of fast particles and global modes
A. Mishchenko, A. Bottino, T. Hayward-Schneider +13
Global simulations of electromagnetic turbulence, collisionless tearing modes, and Alfven Eigenmodes in the presence of fast particles are carried out using the gyrokinetic particl…
Multi-scale analysis of global electromagnetic instabilities in ITER Pre-Fusion-Power Operation plasmas
T. Hayward-Schneider, Ph. Lauber, A. Bottino +1
Global electromagnetic gyrokinetic simulations are performed with the Particle-in-Cell code ORB5 for an ITER Pre-Fusion-Power-Operation (PFPO) plasma scenario, with half-field (2.6…
Gyrokinetic modelling of the Alfvén mode activity in ASDEX Upgrade with an isotropic slowing-down fast-particle distribution
Francesco Vannini, Alessandro Biancalani, Alberto Bottino +8
In the present paper, the evolution of the Alfvén modes is studied in a realistic ASDEX Upgrade equilibrium by analysing the results of simulations with the global, electromagnetic…
Linear and nonlinear excitation of TAE modes by external electromagnetic perturbations using ORB5
Mohsen Sadr, Alexey Mishchenko, Thomas Hayward-Schneider +6
The excitation of toroidicity induced Alfv{é}n eigenmodes (TAEs) using prescribed external electromagnetic perturbations (hereafter ``antenna") acting on a confined toroidal plasma…
Numerics and computation in gyrokinetic simulations of electromagnetic turbulence with global particle-in-cell codes
Alexey Mishchenko, Alessandro Biancalani, Alberto Bottino +7
Electromagnetic turbulence is addressed in tokamak and stellarator plasmas with the global gyrokinetic particle-in-cell codes ORB5 [E. Lanti et al, Comp. Phys. Comm, vol. 251, 1070…
Gyrokinetic investigation of the nonlinear interaction of Alfvén instabilities and energetic-particle driven geodesic acoustic modes
F. Vannini, A. Biancalani, A. Bottino +6
This paper presents a study of the interaction between Alfvén modes and zonal structures, considering a realistic ASDEX Upgrade equilibrium. The results of gyrokinetic simulations…
Gyrokinetic investigation of Alfvén instabilities in the presence of turbulence
A. Biancalani, A. Bottino, A. Di Siena +10
The nonlinear dynamics of beta-induced Alfvén Eigenmodes (BAE) driven by energetic particles (EP) in the presence of ion-temperature-gradient (ITG) turbulence is investigated, by m…
Nonlinear gyrokinetic PIC simulations in stellarators with the code EUTERPE
E. Sánchez, A. Mishchenko, J. M. García-Regaña +4
In this work, the first nonlinear particle-in-cell simulations carried out in a stellarator with the global gyrokinetic code EUTERPE using realistic plasma parameters are reported.…
Gyrokinetic investigation of Alfvén instabilities in the presence of turbulence
A. Biancalani, A. Bottino, A. Di Siena +5
The global and electromagnetic gyrokinetic particle-in-cell code ORB5 is employed to investigate the self-consistent interactions between Alfvén modes (AM) and ion temperature grad…
Effect of the electron redistribution on the nonlinear saturation of Alfvén eigenmodes and the excitation of zonal flows
A. Biancalani, A. Bottino, P. Lauber +2
Numerical simulations of Alfvén modes (AM) driven by energetic particles are performed with the GK global PIC code ORB5. A reversed shear equilibrium magnetic field is adopted. A s…
Gyrokinetic investigation of the damping channels of Alfvén modes in ASDEX Upgrade
F. Vannini, A. Biancalani, A. Bottino +6
The linear destabilization and nonlinear saturation of energetic-particle driven Alfvénic instabilities in tokamaks strongly depend on the damping channels. In this work, the colli…
ORB5: a global electromagnetic gyrokinetic code using the PIC approach in toroidal geometry
E. Lanti, N. Ohana, N. Tronko +20
This paper presents the current state of the global gyrokinetic code ORB5 as an update of the previous reference [Jolliet et al., Comp. Phys. Commun. 177 409 (2007)]. The ORB5 code…
Pullback scheme implementation in ORB5
Alexey Mishchenko, Alberto Bottino, Alessandro Biancalani +9
The pullback scheme is implemented in the global gyrokinetic particle-in-cell code ORB5 [S. Jolliet et al, Comp. Phys. Comm., 177, 409 (2007)] to mitigate the cancellation problem…
Electrostatic stability of electron-positron plasmas in dipole geometry
Alexey Mishchenko, Gabriel Plunk, Per Helander
The electrostatic stability of electron-positron plasmas is investigated in the point-dipole and Z-pinch limits of dipole geometry. The kinetic dispersion relation for sub-bounce-f…
Gyrokinetic Stability of Electron-Positron-Ion Plasmas
Alexey Mishchenko, Alessandro Zocco, Per Helander +1
The gyrokinetic stability of electron-positron plasmas contaminated by ion (proton) admixture is studied in slab geometry. The appropriate dispersion relation is derived and solved…
Semianalytical calculation of the zonal-flow oscillation frequency in stellarators
Pedro Monreal, Edilberto Sánchez, Iván Calvo +5
Due to their capability to reduce turbulent transport in magnetized plasmas, understanding the dynamics of zonal flows is an important problem in the fusion programme. Since the pi…
Nonlinear interplay of Alfven instabilities and energetic particles in tokamaks
A. Biancalani, A. Bottino, M. Cole +5
The confinement of energetic particles (EP) is crucial for an efficient heating of tokamak plasmas. Plasma instabilities such as Alfven Eigenmodes (AE) can redistribute the EP popu…
Linear gyrokinetic particle-in-cell simulations of Alfven instabilities in tokamaks
A. Biancalani, A. Bottino, S. Briguglio +6
The linear dynamics of Alfven modes in tokamaks is investigated here by means of the global gyrokinetic particle-in-cell code NEMORB. The model equations are shown and the local sh…
Pullback transformation in gyrokinetic electromagnetic simulations
Alexey Mishchenko, Axel Könies, Ralf Kleiber +1
It is shown that a considerable improvement in the global gyrokinetic electromagnetic simulations can be achieved by a slight modification of the simulation scheme. The new scheme…