A5101992272- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Superconducting Materials and Applications
- Laser-Plasma Interactions and Diagnostics
- Nonlinear Waves and Solitons
- Solar and Space Plasma Dynamics
- Nonlinear Photonic Systems
- Fusion materials and technologies
- Particle accelerators and beam dynamics
- Advanced Mathematical Physics Problems
- Quantum chaos and dynamical systems
- Catalytic Processes in Materials Science
- Mathematical and Theoretical Epidemiology and Ecology Models
- Mesoporous Materials and Catalysis
- Stochastic processes and statistical mechanics
- Astro and Planetary Science
- Algebraic structures and combinatorial models
- Nonlinear Differential Equations Analysis
- Numerical methods for differential equations
- Fractional Differential Equations Solutions
- Zeolite Catalysis and Synthesis
Dalian University of Technology
2014-2024
Southwestern Institute of Physics
2022
Dalian Institute of Chemical Physics
2021
Chinese Academy of Sciences
2021
Dalian University
2021
Hybrid simulations with the global kinetic-magnetohydrodynamic (MHD) code M3D-K have been carried out to investigate linear stability and nonlinear dynamics of beam-driven fishbone in experimental advanced superconducting tokamak (EAST) experiment. Linear show that a low frequency instability is excited at value beam ion pressure. The mode mainly driven by energy ions via precessional resonance. results are consistent measurement respect structure. When pressure increased exceed critical...
In DIII-D sawteething plasmas, long-lived (1,1) kink modes are often observed between sawtooth crashes. The saturated have two distinct frequencies. mode with higher frequency transits to a fishbone-like sufficient on-axis neutral beam power. this work, hybrid simulations the global kinetic-magnetohydrodynamic (MHD) code M3D-K been carried out investigate linear stability and nonlinear dynamics of n = 1 effects energetic ions for typical discharge where both fishbone were observed. Linear...
Abstract Fishbone instabilities and internal transport barriers (ITBs) are frequently sequentially observed in tokamak plasmas. Recently, the relationship between fishbone ITBs was numerically studied, mainly on basis of experimental results (Liu et al 2020 Nucl. Fusion 60 122001). It identified that a radial electric field can be generated by itself, which may act as trigger for ITB formation. To gain deeper understanding this subject, work we further demonstrate multiple interactions...
In DIII-D hybrid discharges, the intense Alfvén eigenmode (AE) activity driven by Neutral Beam Injection that is typically observed can be suppressed and replaced fishbone modes when Electron Cyclotron Current Drive (ECCD) centrally applied. Simulations have been carried out with kinetic-magnetohydrodynamic code M3D-K based on discharges #161401 without ECCD #161403 ECCD, respectively. both cases, unstable are found—the mode frequency structure indicate instability excited in of type, while...
Linear and nonlinear simulations of high-order harmonics q=1 energetic particle modes excited by trapped particles in tokamaks are carried out using kinetic/magnetohydrodynamic hybrid code M3D-K. It is found that with a flat safety factor profile the core region, linear growth rate (m=n>1) driven can be higher than m/n=1/1 component. The high m=n>1 become more unstable when pressure becomes higher. Moreover, it shown there exist multiple resonant locations satisfying different...
A tokamak scenario with q(0) close to 1 has been achieved on HL-2A tokamak, which is an internal transport barrier (ITB) at low central shear or a steady-state ITB combined H-mode edge barrier. In this scenario, the formation of steep ion temperature profile observed be closely linked q = magnetic surface and magnetohydrodynamic (MHD) activities around it, such as long-lived mode (LLM) fishbone activities. Experimental evidence simulation analysis suggest that can induce poloidal flow,...
The influence of trapped energetic ions (TEIs) on m/n=2/1 low-frequency magnetohydrodynamic (MHD) instabilities with reversed shear profile is investigated by a global kinetic–MHD hybrid simulation. For low energetic-ion beta, TEIs have stabilizing effect the double tearing mode (DTM). When beta larger than threshold, an energetic-particle-driven mode, fishbone-like (FLM), excited; that is, transition from DTM to FLM occurs. threshold increases increasing resistivity, and growth rate reduced...
This study investigates anomalous transport in tokamak plasmas by employing general conformable fractional derivatives (GCFDs) and utilizing diffusion equations (GCFDEs). GCFDs, which are local functions, exhibit properties similar to those of ordinary derivatives. The action can be defined the definition inverse operation equation motion (GCFEM) is derived through calculus variations. Introducing a damping term GCFEM results Langevin (GCFLE). Solutions GCFLE indicate scaling law for mean...
Abstract Confinement of alpha particles is one the key issues burning plasma in tokamaks. Due to discreteness toroidal field (TF) coils, loss induced by TF ripple can cause a strong heat load on first wall. In this work, using guiding center code ORBIT, we investigated particle Chinese Fusion Engineering Test Reactor (CFETR) steady-state scenario (v20190422), which both initial distribution and classical slowing down are considered. Effects three mechanisms, namely prompt loss, well trapping...
The effects of resonant magnetic perturbations (RMPs) on tangential neutral beam heating in the EAST tokamak are studied numerically. RMPs with linear resistive magnetohydrodynamics response used modeling. A variety representing configurations RMP coil currents examined, and their injection (NBI) efficiency compared, order to find a parameter window where deleterious NBI minimized. It is found that internal redistribution fast ions by induces local accumulation ions, resulting higher ion...
A one-dimensional electrostatic collisionless particle-in-cell code has been developed to study the nonlinear interaction between waves and energetic particles (EPs). For a single wave, results are clear agree well with existing theories. coexisting two waves, although mode coupling wave fields is ignored, second-order phase space islands can still exist first-order generated by waves. However, not formed superposed perturbed motions of EPs induced combined effect main resonances make these...
We consider a weakly dissipative modified two-component Dullin–Gottwald–Holm system. The existence of global weak solutions to the system is established. first give well-posedness result viscous approximate problem and obtain basic energy estimates. Then, we show that limit approximation solution Copyright © 2014 John Wiley & Sons, Ltd.
The formation of holes and clumps has been investigated by using a one-dimensional electrostatic particle-in-cell code with the effect background dissipation dynamical friction. results show that is primary reason for frequency sweeping, friction can enhance sweeping in damped case. A finite velocity distribution energetic particles (EPs) modulate range sweeping. evolution continuous observed phase space. central islands are torn two parts, which shift away from resonance center, afterward,...
Abstract Adiabatic response effects on high-frequency fishbone instability driven by passing energetic ions are studied. With finite orbit width effects, the adiabatic contribution <?CDATA $\delta {W}_{{\rm{hf}}}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>δ</mml:mi> <mml:msub> <mml:mrow> <mml:mi>W</mml:mi> </mml:mrow> <mml:mi mathvariant="normal">hf</mml:mi> </mml:msub> </mml:math> is derived analytically for purely ions. By approximating to first...