71 citations · 227 across the 12 of their papers we have counts for
12 papers
Self-consistent simulation of compressional Alfvén eigenmodes excited by runaway electrons
Chang Liu, Andrey Lvovskiy, Carlos Paz-Soldan +2
Alfvénic modes in the current quench (CQ) stage of the tokamak disruption have been observed in experiments. In DIII-D the excitation of these modes is associated with the presence…
Hybrid simulation of energetic particles interacting with magnetohydrodynamics using a slow manifold algorithm and GPU acceleration
Chang Liu, Stephen C. Jardin, Hong Qin +3
The hybrid method combining particle-in-cell and magnetohydrodynamics can be used to study the interaction between energetic particles and global plasma modes. In this paper we int…
Self-consistent simulation of resistive kink instabilities with runaway electrons
Chang Liu, Chen Zhao, Stephen C. Jardin +4
A new fluid model for runaway electron simulation based on fluid description is introduced and implemented in the magnetohydrodynamics code M3D-C1, which includes self-consistent i…
Compressional Alfvén eigenmodes excited by runaway electrons
Chang Liu, Dylan P. Brennan, Andrey Lvovskiy +3
Compressional Alfvén eigenmodes (CAE) driven by energetic ions have been observed in magnetic fusion experiments. In this paper, we show that the modes can also be driven by runawa…
Structure and overstability of resistive modes with runaway electrons
Chang Liu, Chen Zhao, Stephen C. Jardin +3
We investigate the effects of runaway electron current on the dispersion relation of resistive magnetohydrodynamic modes in tokamaks. We present a new theoretical model to derive t…
The role of magnetic moment in the collisionless pitch-angle scattering of runaway electrons
Chang Liu, Hong Qin, Eero Hirvijoki +2
Recently, the validity of the guiding-center approach to model relativistic runaway electrons in tokamaks has been challenged by full-orbit simulations that demonstrate the breakdo…
The effects of kinetic instabilities on the electron cyclotron emission from runaway electrons
Chang Liu, Lei Shi, Eero Hirvijoki +4
In this paper we show that the kinetic instabilities associated with runaway electron beams play an essential role for the production of high-level non-thermal electron-cyclotron-e…
A fluid-kinetic framework for self-consistent runaway-electron simulations
Eero Hirvijoki, Chang Liu, Guannan Zhang +2
The problem of self-consistently coupling kinetic runaway-electron physics to the macroscopic evolution of the plasma is addressed by dividing the electron population into a bulk a…
Role of kinetic instability in runaway electron avalanche and elevated critical electric fields
Chang Liu, Eero Hirvijoki, Guo-yong Fu +3
The effects of kinetic whistler-wave instabilities on the runaway-electron (RE) avalanche is investigated. With parameters from DIII-D experiments, we show that RE scattering from…
Momentum transport and nonlocality in heat-flux-driven magnetic reconnection in high energy density plasmas
Chang Liu, William Fox, Amitava Bhattacharjee +2
Recent theory has demonstrated a novel physics regime for magnetic reconnection in high-energy-density plasmas where the magnetic field is advected by heat flux via the Nernst effe…
Adjoint Fokker-Planck equation and runaway electron dynamics
Chang Liu, Dylan P. Brennan, Amitava Bhattacharjee +1
The adjoint Fokker-Planck equation method is applied to study the runaway probability function and the expected slowing-down time for highly relativistic runaway electrons, includi…
Nonlinear frequency shift of electrostatic waves in general collisionless plasma: unifying theory of fluid and kinetic nonlinearities
Chang Liu, Ilya Y. Dodin
The nonlinear frequency shift is derived in a transparent asymptotic form for intense Langmuir waves in general collisionless plasma. The formula describes both fluid and kinetic e…