A5001335726- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Solar and Space Plasma Dynamics
- Laser-Plasma Interactions and Diagnostics
- Fusion materials and technologies
- Physics of Superconductivity and Magnetism
- Plasma Diagnostics and Applications
- Dust and Plasma Wave Phenomena
- Nuclear reactor physics and engineering
- High-pressure geophysics and materials
- Cloud Computing and Resource Management
- Software-Defined Networks and 5G
- Advanced Data and IoT Technologies
- Atomic and Subatomic Physics Research
- Induction Heating and Inverter Technology
- IoT and Edge/Fog Computing
- Software System Performance and Reliability
- Tropical and Extratropical Cyclones Research
- Blockchain Technology Applications and Security
- Technology and Security Systems
- Telecommunications and Broadcasting Technologies
- Inertial Sensor and Navigation
- Smart Grid Energy Management
Institute of Plasma Physics
2012-2023
Chinese Academy of Sciences
2012-2023
NARI Group (China)
2021-2023
Hefei Institutes of Physical Science
2011-2023
University of Colorado Boulder
2018-2019
University of Science and Technology of China
2002-2014
Princeton Plasma Physics Laboratory
2014
Abstract Conventional well logs typically have insufficient vertical resolution for thin-bed evaluation. In this study, we use an auto-encoder and one high-resolution log to enhance the of conventional within same improved An is a generative artificial neural network capable learning latent representations input data without supervision. First, construct suitable filter based on tool response function low-resolution target apply source generate corresponding log. We then as output train...
Abstract The formation of a static 3-Dimensional (3D) helically localized perturbation structure the Toroidal Alfv'en Eigenmode (TAE) is observed for first time under magnetic islands induced by Resonant Magnetic Perturbations (RMP) in tokamak plasmas. Before application RMP, TAE around 200 kHz excited Electron Cyclotron Resonance Heating (ECRH) Energetic Electrons (EEs). After n = 1 mode into helical area on flux surface, where toroidal number. We find strengthened near X points m/n=-3/1...
Fast ion losses in the presence of resonant magnetic perturbations (RMPs) on EAST tokamak have been simulated by using Monte Carlo orbit-following code GYCAVA (Xu et al 2019 Comput. Phys. Comm. 244 40). ions produced co-current tangential neutral beam injection (NBI) were considered. The initial distribution NBI fast was numerically computed TGCO and n = 1 vacuum response RMP fields MHD MARS-F (Liu 2000 Plasmas 7 3681). It is found that increase almost linearly with coil current. Poincaré...
Abstract The properties of core turbulence and thermal transport are investigated for EAST high- β P ( ∼ 3.1) plasmas with dominant electron heating T e / i > 1) via gyrokinetic simulation the NLT code. Linear simulations identify that electrostatic <?CDATA ${\eta _e}$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msub> <mml:mi>η</mml:mi> <mml:mi>e</mml:mi> </mml:msub> </mml:mrow> </mml:math> -driven trapped mode -TEM) dominates in region ρ...
To investigate the possibility of differential flow speeds between ions same element and their roles in determination ionic fractions, this paper extends our latest minor-ion model to a five-fluid model, describing behavior five species minor one given fast solar wind. We solve sets mass, momentum, energy equations simultaneously include effects ionization, recombination, heating. The are taken as test particles flowing background plasma consisting electrons, protons, alpha particles....
Alfvén eigenmodes in up-down asymmetric tokamak equilibria are studied by a new magnetohydrodynamic eigenvalue code. The code is verified with the NOVA for Solovév equilibrium and then used to study of Experimental Advanced Superconducting Tokamak. frequency mode structure toroidicity-induced calculated. It demonstrated numerically that asymmetry induces phase variation eigenfunction across major radius on midplane.
Kinetic-MagnetoHydroDynamic hybrid simulations are carried out to investigate fishbone modes excited by fast ions on the Experimental Advanced Superconducting Tokamak. The use realistic equilibrium reconstructed from experiment data with constraint of q = 1 surface location (q is safety factor). Anisotropic slowing down distribution used model neutral beam injection. resonance condition identify interaction between mode and ions, which shows that simultaneously in bounce motion trapped...
Kinetic-MHD hybrid simulations are carried out to investigate possible fast-ion-driven modes on the Experimental Advanced Superconducting Tokamak. Three typical kinds of modes, namely, toroidicity-induced Alfvén eigenmodes, reversed shear and energetic-particle continuum observed simultaneously in simulations. The simulation results compared with an ideal MHD eigenvalue code, which shows agreement respect mode frequency, dominant poloidal numbers, radial location. However, take a twisted...
Multiple toroidal Alfvén eigenmodes (TAEs) driven unstable by energetic electrons and a geodesic acoustic mode (GAM) have been successively observed in the Experimental Advanced Superconducting Tokamak (EAST) low-density Ohmic discharges. Nonlinear couplings among these modes are conclusively identified. Theoretical analysis suggests that coupling of simultaneously TAEs is mechanism for GAM excitation. These results experimentally show potential role nonlinear to saturation...
The synergy between electron cyclotron current drive (ECCD) and lower hybrid (LHCD) is investigated numerically with the parameters of HL-2A tokamak. Based on understanding mechanisms, a high driven efficiency or desired radial profile can be achieved through properly matching ECCD LHCD due to flexibility ECCD. Meanwhile, it found that total by wave (ECW) (LHW) simultaneously smaller than sum currents ECW LHW separately, when power much larger power. One reasons leading this phenomenon...
Blockchain technology provides the possibility for realization of decentralized energy trading. However, blockchain confronts privacy risks and efficiency issues, which hinder its application in In this paper, to solve problem, we propose an efficient privacy-preserving trading scheme a environment. We account mapping algorithm attack problem. new transaction processing method, can protect private data improve execution by two-layer processing. Finally, verify effectiveness proposed...
A deep neural network is developed and trained on magnetic measurements (input) EFIT poloidal flux (output) the EAST tokamak. In optimizing architecture, we use automatic optimization to search for best hyperparameters, which helps in better model generalization. We compare inner surfaces last-closed-flux with those from EFIT. also calculated normalized internal inductance, completely determined by can further reflect accuracy of prediction. The time evolution inductance full discharge...
Toroidal Alfvén eigenmodes (TAE) and ellipticity induced (EAE) driven by fast electrons are observed for the first time in steady-state EAST plasmas heated lower hybrid wave (LHW). For analyzed discharge four modes appear after injection of LHW. Comparing experimental observations with simulation, high frequency located near low mode is . The two positions very close to where most heating power deposited population inversion occurs. Analysis resonance condition between particles waves...
Suppression and mitigation of a high-frequency Alfvén-like mode (HFAM) between type-I edge localized modes (ELMs) during ELM by resonant magnetic perturbation (RMP) is observed for the first time in EAST tokamak. This located near pedestal region. The modeling result Alfvén continuum shows that HFAM elipical eigenmode (EAE) gap. During application n = 1 RMP mitigation, can be fully suppressed when amplitude exceeds threshold, below which mitigated. suppression caused reduction height induced...
Since Alfvén activity and turbulence are ubiquitous in magnetically confined plasma, it is important to understand the possible roles have nonlinear evolution of turbulence. The designed experiments low collisionality dedicated studying dynamics between toroidal eigenmodes (TAEs), assessing multi-scale physics on long-term scale behavior fusion plasma. In TAEs (f ∼ 200 kHz, n = 1) mitigation under resonant magnetic perturbations (RMP, nupper 2 nlower 3), there a (∼500 ms) quasi-stationary...
A formula based on the solutions to drift kinetic equation is proposed for modeling trapped electron correction shielding current in neutral beam drive general tokamak equilibria and arbitrary collisionality regime.
Toroidal Alfvén eigenmodes (TAEs) excited in purely ohmically heated plasmas without any auxiliary heating have been identified for the first time SUNIST spherical tokamak. The TAE modes are observed during minor disruptions and a frequency range of 150–500 kHz. mode structure analysis indicates existence both m/n = −3/−1 −4/−1 harmonics, propagating electron diamagnetic direction laboratory frame reference. These TAEs appear simultaneously with generation runaway electrons current quench...
The feasibility of using full ion kinetics, instead gyrokinetics, in simulating low-frequency Ion-Temperature-Gradient (ITG) instabilities tokamaks has recently been demonstrated. present work extends the kinetics to nonlinear regime and investigates saturation a single-n ITG instability due E × B trapping mechanism (n is toroidal mode number). amplitude predicted by theory found agree with level observed simulation. In extending regime, we developed Boris orbit integrator, which proved be...