A5063587658- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Nonlinear Photonic Systems
- Solar and Space Plasma Dynamics
- Nonlinear Dynamics and Pattern Formation
- Plasma Diagnostics and Applications
- Quantum chaos and dynamical systems
- Plasma Applications and Diagnostics
- Advanced Fiber Laser Technologies
- Fluid Dynamics and Turbulent Flows
- Fault Detection and Control Systems
- Stability and Control of Uncertain Systems
- Dust and Plasma Wave Phenomena
- Particle accelerators and beam dynamics
- Adaptive Control of Nonlinear Systems
- Bluetooth and Wireless Communication Technologies
- Laser-Plasma Interactions and Diagnostics
Ludong University
2011-2023
Dalian University of Technology
2006-2007
In this paper, a one-dimensional model is explored to investigate the frequency effects on characteristics of atmospheric radio discharges at given power. The simulation data and analytical results show that improvement electron density can be observed with better discharge stability by increasing excitation in an appropriate range. Using equations deduced from model, mean could inferred means measured parameters. α-γ mode transition especially high also analytically discussed based...
A dispersion relation is derived for the stability of resistive wall mode (RWM), which includes both layer damping physics and toroidal precession drift resonance from energetic ions in tokamak plasmas. The numerically solved a model plasma, purpose systematic investigation RWM multi-dimensional plasma parameter space including resistivity, radial location wall, as well flow velocity. It found that favorable average curvature contributes significant stabilization RWM. This further enhanced...
The effects of impurity ions on the kinetic shear Alfvén (KSA) instability in tokamak plasmas are investigated by numerically solving integral equations for KSA eigenmode toroidal geometry. hydrogen and ions, including transit motion, finite ion Larmor radius, finite-orbit-width, taken into account. Toroidicity induced linear mode coupling is included through ballooning-mode representation. Here, carbon, oxygen, tungsten investigated. It found that, depending concentration density profile...
Turbulence governed by a generalized nonlinear Schr\"odinger equation (GNSE) including viscous heating and damping is numerically investigated. It found that large localized pulse can suffer modulational instability then collapse into the shortest-wavelength modes, as for classical equation. However, total energy of nonconservative GNSE also become constant during via local balance gain loss in phase space. After collapse, instead inverse cascading state strong turbulence with broad...
The evolution of isotropic and anisotropic systems governed by the complex nonlinear Schrodinger equation is investigated numerically. It found that modulational instability, collapse, mode cascade strong turbulence can occur in different forms.
The neoclassical toroidal plasma viscosity torque and electromagnetic torque, generated by tearing mode (TM) in a plasma, are numerically investigated using the MARS-Q code [Liu et al., Phys. Plasmas 20, 042503 (2013)]. It is found that an initially unstable can intrinsically drive flow resulting steady state solution, absence of external momentum input magnetic field perturbation. saturated order 0.5%ωA at q=2 rational surface considered case, with q ωA being safety factor Alfven frequency...
The resistive wall mode generated by plasma-wall relative rotations is studied numerically in a slab model with compressible plasma flow parallel to the magnetic field. linear growth of investigated different parameters numerical simulations. critical velocities for instability are calculated as wave number and other vary. It found that long wavelength regime, velocity range sound speed cs, predicted theory. In short regime however, increases level Alfvén VA second stable region found. This...
Feedback control of collapse-induced turbulent condensation in a dissipative open Langmuir wave system governed by two-dimensional generalized nonlinear Schrodinger equation is investigated numerically following the evolution an initial disturbance. It found that with self-regulated feedback wavelength asymptotic condensate can, to certain degree, be controlled.
Abstract Stability of the resistive wall mode in cylindrical plasmas confined by surface currents is investigated for δ-function and step-function equilibrium surface-current profiles. For former, it shown that perturbations oscillate even decay all locations initial perturbation. The entire system stable plasma flow has little effect. distribution, found thicker current layer, more if largest perturbation located on rational surface, but also effect system.
This paper focuses on the wave inverse cascade instability analysis with self-regulating feedback control for a fixed external potential field and highly localized finite-amplitude initial pulse. The is carried out by solving corresponding two-dimensional generalized nonlinear Schrödinger equation. firstly suffers from modulation instability, followed collapse into turbulence containing shortest-wavelength modes in system. of shortest wavelength back to longer-wavelength ones, until...
This paper presents an event-triggered anti-disturbance control scheme for the trajectory tracking of ships with time-varying ocean disturbances and actuator saturation. By combining disturbance observer auxiliary dynamic system, a robust observer-based is designed backstepping technique mechanism. The provides on-line estimations. system helps to reduce saturation effects. mechanism avoids wear tear actuators through implementing signals on triggering periods. It theoretically proven that...