Gyrokinetic theory of toroidal Alfvén eigenmode saturation via nonlinear wave–wave coupling

Z Qiu, L Chen, F Zonca - Reviews of Modern Plasma Physics, 2023 - Springer
Nonlinear wave–wave coupling constitutes an important route for the turbulence spectrum
evolution in both space and laboratory plasmas. For example, in a reactor relevant fusion …

Nonlinear dynamics and phase space transport by chorus emission

F Zonca, X Tao, L Chen - Reviews of Modern Plasma Physics, 2021 - Springer
Chorus emission in planetary magnetospheres is taken as working paradigm to motivate a
short tutorial trip through theoretical plasma physics methods and their applications. Starting …

ATEP: an advanced transport model for energetic particles

P Lauber, M Falessi, G Meng… - Nuclear …, 2024 - iopscience.iop.org
In this paper we report on the implementation and verification of a phase-space resolved
energetic particle (EP) transport model. It is based on a first-principle theoretical framework …

Physics of drift Alfvén instabilities and energetic particles in fusion plasmas

Y Li, MV Falessi, P Lauber, Y Li, Z Qiu… - Plasma Physics and …, 2023 - iopscience.iop.org
Shear Alfvén wave (SAW)/drift Alfvén wave (DAW) fluctuations can be destabilized by
energetic particles (EPs) as well as thermal plasma components, which play a key role in the …

Time evolution and finite element representation of Phase Space Zonal Structures in ORB5

A Bottino, MV Falessi… - Journal of Physics …, 2022 - iopscience.iop.org
Abstract Phase Space Zonal Structures (PSZSs), obtained by averaging out dependencies
on angle-like variables in the energetic particle (EP) distribution function, play a fundamental …

Wave trapping and E× B staircases

X Garbet, O Panico, R Varennes, C Gillot… - Physics of …, 2021 - pubs.aip.org
A model of E× B staircases is proposed based on a wave kinetic equation coupled to a
poloidal momentum equation. A staircase pattern is idealized as a periodic radial structure …

Representation and modeling of charged particle distributions in tokamaks

A Bierwage, M Fitzgerald, P Lauber, M Salewski… - Computer Physics …, 2022 - Elsevier
Experimental diagnostics, analysis tools and simulations represent particle distributions in
various forms and coordinates. Algorithms to manage these data are needed on platforms …

Low-frequency shear Alfvén waves at DIII-D: Theoretical interpretation of experimental observations

R Ma, WW Heidbrink, L Chen, F Zonca, Z Qiu - Physics of Plasmas, 2023 - pubs.aip.org
The linear properties of the low-frequency shear Alfvén waves such as those associated with
the beta-induced Alfvén eigenmodes (BAEs) and the low-frequency modes observed in …

Nonlinear interaction of Alfvénic instabilities and turbulence via the modification of the equilibrium profiles

A Biancalani, A Bottino, D Del Sarto… - Journal of Plasma …, 2023 - cambridge.org
Nonlinear simulations of Alfvén modes (AMs) driven by energetic particles (EPs) in the
presence of turbulence are performed with the gyrokinetic particle-in-cell code ORB5. The …

[HTML][HTML] Drift wave soliton formation via beat-driven zonal flow and implication on plasma confinement

N Chen, L Chen, F Zonca, Z Qiu - Physics of Plasmas, 2024 - pubs.aip.org
In this work, gyrokinetic theory of drift waves (DWs) self-regulation via the beat-driven zonal
flow (ZF) is presented, and finite diamagnetic drift frequency due to plasma nonuniformity is …