61 citations · 435 across the 32 of their papers we have counts for
32 papers
Core localized alpha-channeling via low frequency Alfven mode generation in reversed shear scenarios
Zhiyong Qiu, Shizhao Wei, Tao Wang +2
A novel channel for fuel ions heating in tokamak core plasma is proposed and analyzed using nonlinear gyrokinetic theory. The channel is achieved via spontaneous decay of reversed…
Gyrokinetic theory of toroidal Alfvén eigenmode saturation via nonlinear wave-wave coupling
Zhiyong Qiu, Liu Chen, Fulvio Zonca
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 pl…
On Nonlinear Scattering of Drift Wave by Toroidal Alfven Eigenmode in Tokamak Plasmas
Liu Chen, Zhiyong Qiu, Fulvio Zonca
Using electron drift wave (eDW) as a paradigm model, we have investigated analytically direct wave-wave interactions between a test DW and ambient toroidal Alfvén eigenmodes (TAE)…
Nonlinear equilibria and transport processes in burning plasmas
Matteo Valerio Falessi, Liu Chen, Zhiyong Qiu +1
In this work, we put forward a general phase-space transport theory in axisymmetric tokamak plasmas based upon the concept of zonal state (ZS). Within this theoretical framework, t…
Global simulations of kinetic-magnetohydrodynamic processes with energetic electrons in tokamak plasmas
Jian Bao, Wenlu Zhang, Ding Li +7
The energetic electrons (EEs) generated through auxiliary heating have been found to destabilize various Alfven eigenmodes (AEs) in recent experiments, which in turn lead to the EE…
Low-frequency shear Alfvén waves at DIII-D: theoretical interpretation of experimental observations
Ruirui Ma, W. W. Heidbrink, Liu Chen +2
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 revers…
The enhanced soliton propagation and energy transfer in the coupled drift wave and energetic-particle-induced geodesic acoustic mode system
Ningfei Chen, Guangyu Wei, Zhiyong Qiu
The evolution of the coupled drift wave (DW) and energetic-particle-induced geodesic acoustic mode (EGAM) nonlinear system is investigated using the fully nonlinear coupled DW-EGAM…
On scattering and damping of Toroidal Alfven eigenmode by drift wave turbulence
Liu Chen, Zhiyong Qiu, Fulvio Zonca
We demonstrate analytically that, in toroidal plasmas, scattering by drift wave turbulence could lead to appreciable damping of toroidal Alfven eigenmodes via generation of short-w…
Core localized alpha-channeling via low frequency Alfven mode generation in reversed shear scenarios
Shizhao Wei, Tao Wang, Liu Chen +2
A novel channel for fuel ions heating in tokamak core plasma is proposed and analyzed using nonlinear gyrokinetic theory. The channel is achieved via spontaneous decay of reversed…
Nonlinear reversed shear Alfven eigenmode saturation due to spontaneous zonal current generation
Shizhao Wei, Tao Wang, Ningfei Chen +1
General nonlinear equations describing reversed shear Alfven eigenmode (RSAE) self-modulation via zero frequency zonal structure (ZFZS) generation are derived using nonlinear gyrok…
Soliton generation and drift wave turbulence spreading via geodesic acoustic mode excitation
Ningfei Chen, Shizhao Wei, Guangyu Wei +1
The two-field equations governing fully nonlinear dynamics of the drift wave (DW) and geodesic acoustic mode (GAM) in the toroidal geometry are derived in nonlinear gyrokinetic fra…
Effects of radial electric field on ion temperature gradient driven mode stability
Ningfei Chen, Hanyuan Hu, Xiangyu Zhang +2
The local stability of ion-temperature gradient driven mode (ITG) in the presence of a given radial electric field is investigated using gyrokinetic theory and ballooning mode form…
Nonlinear coupling of reversed shear Alfven eigenmode and toroidal Alfven eigenmode during current ramp
Shizhao Wei, Yahui Wang, Peiwan Shi +3
Two novel nonlinear mode coupling processes for reversed shear Alfven eigenmode (RSAE) nonlinear saturation are proposed and investigated. In the first process, RSAE nonlinearly co…
Evidence of "Two Plasmon" decay of energetic particle induced geodesic acoustic mode
Zhiyong Qiu, Liu Chen, Fulvio Zonca +1
Secondary low frequency mode generation by energetic particle induced geodesic acoustic mode (EGAM) observed in LHD experiment is studied using nonlinear gyrokinetic theory. It is…
Dynamics of reversed shear Alfvén eigenmode and energetic particles during current ramp-up
Tao Wang, Zhiyong Qiu, Fulvio Zonca +2
Hybrid MHD-gyrokinetic code simulations are used to investigate the dynamics of frequency sweeping reversed shear Alfvén eigenmode (RSAE) strongly driven by energetic particles (EP…
Zero frequency zonal flow excitation by energetic electron driven beta-induced Alfven eigenmode
Zhiyong Qiu, Liu Chen, Fulvio Zonca +1
Zero frequency zonal flow (ZFZF) excitation by trapped energetic electron driven beta-induced Alfven eigenmode (eBAE) is investigated using nonlinear gyrokinetic theory. It is foun…
High frequency mode generation by toroidal Alfven eigenmodes
Shizhao Wei, Peiwan Shi, Liming Yu +3
Nonlinear generation of high frequency mode (HFM) by toroidal Alfven eigenmode (TAE) observed in HL-2A tokamak is analyzed using nonlinear gyrokinetic theory. It is found that, the…
Nonlinear excitation of geodesic acoustic mode by toroidal Alfvén eigenmodes and impact on plasma performance
Zhiyong Qiu, Liu Chen, Fulvio Zonca +1
Spontaneous nonlinear excitation of geodesic acoustic mode (GAM) by toroidal Alfvén eigenmode (TAE) is investigated using nonlinear gyrokinetic theory. It is found that, the nonlin…
Nonlinear dynamics of Shear Alfvén fluctuations in Divertor Tokamak Test facility plasmas
Tao Wang, Xin Wang, Sergio Briguglio +3
Following the analysis on linear spectra of shear Alfvén fluctuations excited by energetic particles (EPs) in the Divertor Tokamak Test (DTT) facility plasmas [T. Wang et al., Phys…
Nonlinear saturation of toroidal Alfven eigenmodes via nonlinear mode couplings
Zhiyong Qiu, Liu Chen, Fulvio Zonca +1
Gyrokinetic theory of nonlinear mode coupling as a mechanism for toroidal Alfven eigenmode (TAE) saturation in the fusion plasma related parameter regime is presented, including 1)…
Gyrokinetic theory of the nonlinear saturation of toroidal Alfven eigenmode
Zhiyong Qiu, Liu Chen, Fulvio Zonca
Nonlinear saturation of toroidal Alfven eigenmode (TAE) via ion induced scatterings is investigated in the short-wavelength gyrokinetic regime. It is found that the nonlinear evolu…
Nonlinear velocity redistribution caused by energetic-particle-driven geodesic acoustic modes, mapped with the beam-plasma system
A. Biancalani, N. Carlevaro, A. Bottino +2
The nonlinear dynamics of energetic particle (EP) driven geodesic acoustic modes (EGAM) in tokamaks is investigated, and compared with the beam-plasma system (BPS). The EGAM is stu…
Kinetic theory of geodesic acoustic modes in toroidal plasmas: a brief review
Zhiyong Qiu, Liu Chen, Fulvio Zonca
Geodesic acoustic modes (GAM) are oscillating zonal structures unique to toroidal plasmas, and have been extensively studied in the past decades due to their potential capabilities…
Saturation of energetic-particle-driven geodesic acoustic modes due to wave-particle nonlinearity
A. Biancalani, I. Chavdarovski, Z. Qiu +6
The nonlinear dynamics of energetic-particle (EP) driven geodesic acoustic modes (EGAM) is investigated here. A numerical analysis with the global gyrokinetic particle-in-cell code…