A5101772526- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Laser-Plasma Interactions and Diagnostics
- Dust and Plasma Wave Phenomena
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Particle accelerators and beam dynamics
- Solar and Space Plasma Dynamics
- Superconducting Materials and Applications
- High-Energy Particle Collisions Research
- Semiconductor Lasers and Optical Devices
- Concrete Corrosion and Durability
- Optical Network Technologies
- TiO2 Photocatalysis and Solar Cells
- Cold Fusion and Nuclear Reactions
- Plasma Diagnostics and Applications
- Transition Metal Oxide Nanomaterials
- Non-Destructive Testing Techniques
- Black Holes and Theoretical Physics
- Perovskite Materials and Applications
- Advanced Optical Network Technologies
- Nuclear reactor physics and engineering
- Ultrasonics and Acoustic Wave Propagation
Dalian University of Technology
2017-2024
Yangzhou University
2020
Jianghan University
2019
The resonant interaction between energetic-particles and tearing mode is an unresolved physics issue at present. It found for the first time in tokamaks that unstable with slowly rotating m/n = 2/1 helicity, where represent poloidal/toroidal mode-numbers, interacts energetic-ions results amplitude-bursting/frequency-chirping fishbone-like activities. Nonlinear hybrid kinetic-MHD simulations M3D-K code prove co-passing are responsible drive of modes, wave-particle resonance condition...
The effect of energetic-ions on magnetohydrodynamic instabilities is pivotal in the basic physics that will be vital burning plasma experiments. Recently, it has been found HL-2A tokamak an m/n = 2/1 unstable tearing mode (TM) interacts with energetic-ions, resulting amplitude-bursting and frequency-chirping fishbone-like activities, numerically identified co-passing play a dominant role wave-particle resonances (Chen et al 2019 Nucl. Fusion 59 096037). Motivated by fully deeply...
We report an experimental result on the stabilization of energetic–ion driven internal kink mode (ion fishbone) by electron cyclotron resonance heating (ECRH), observed for first time in a toroidal plasma. The asserts itself resistive branch close to marginal stability point. resulting fishbone depends not only injected power but also radial deposition location ECRH, and instability can be completely suppressed when ECRH exceeds certain threshold. Analysis dispersion relation, including...
Abstract Large burst activity, identified as toroidal Alfvén eigenmode (TAE) avalanche, occurs frequently in neutral-beam heated plasmas National Spherical Torus Experiment (NSTX). Based on the typical experimental observation of TAE avalanche NSTX, a self-consistent nonlinear multiple wave-number ( k ∥ ≃ n / R , where mode-number and major radius) simulation associated with avalanches is performed using parameters profiles before occurrence M3D-K input. The wave–wave coupling among...
Abstract The resonant interaction between <?CDATA $m/n = 2/1$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>m</mml:mi> <mml:mrow> <mml:mo>/</mml:mo> </mml:mrow> <mml:mi>n</mml:mi> <mml:mo>=</mml:mo> <mml:mn>2</mml:mn> <mml:mn>1</mml:mn> </mml:math> tearing mode (TM) and energetic ions redistributed by 1/1$?> fishbone/sawtooth collapse has been observed recently in HL-2A neutral beam injection-heated high-density plasmas, where m is the poloidal number...
Understanding cross-field anomalous transport is a central issue in the magnetic confinement fusion research. Recently, long range large avalanche electron heat event has been observed HL-2A neutral beam injection heated low-confinement mode (L-mode) plasmas. It found and identified firstly that non-linear couplings between high-frequency core-localized toroidal Alfvén eigenmodes low-frequency fishbone with , where m n are poloidal mode-numbers, respectively, trigger within several hundred...
Abstract Recent observations on the HL-2A tokamak give new experimental evidence of resonant tearing modes (r-TMs) caused by redistribution energetic ions (EIs) due to sawtooth collapses in neutral beam injection plasmas. The <?CDATA $m/n = 2/1$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>m</mml:mi> <mml:mrow> <mml:mo>/</mml:mo> </mml:mrow> <mml:mi>n</mml:mi> <mml:mo>=</mml:mo> <mml:mn>2</mml:mn> <mml:mn>1</mml:mn> </mml:math> ( m and n are poloidal...
Abstract Mitigation of long-lived mode (LLM) by lower hybrid wave (LHW) is recently achieved on the HL-2A tokamak. The LLM changes from a typical steady-state to fishbone-like frequency-chirping characteristic, and its higher poloidal harmonics disappear when LHW injected into toroidal plasma. It found that density fluctuation declines during this process while total neutron count increases gradually. Those evidences indicate there mitigation effect LLM, underlying mechanism can be explained...
Numerical research is conducted to investigate the effects of plasma boundary shape on tearing mode triggering explosive bursts in toroidal tokamak plasmas. In this work, m / n = 2/1 responsible for burst. Plasma can be adjusted via adjustment parameters triangularity δ and elongation κ . The investigations are both under low β (close zero) finite regimes. regime, have stabilizing effect burst, stronger. Under a large ( 2.0), evidently enhance positive but barely affects negative regime....
Nonlinear evolution of multiple toroidal Alfvén eigenmodes (TAEs) driven by fast ions is self-consistently investigated kinetic simulations in plasmas. To clearly identify the effect nonlinear coupling on beam ion loss, over single- n modes are also carried out and compared with those multiple- modes, wave-particle resonance particle trajectory lost phase space analyzed detail. It found that case, overlap occurs so loss level rather higher than sum represents summation all case. Moreover,...
Abstract Based on the conventional tokamak HL-2A-like parameters and profiles, linear properties nonlinear dynamics of non-resonant kink mode (NRK) fishbone instability (NRFB) in reversed shear plasmas are investigated by using global hybrid kinetic-magnetohydrodynamic code M3D-K. This work mainly focuses effect passing energetic-ions NRK NRFB instabilities, which is different from previous works. It demonstrated that can be destabilized when energetic-ion beta β h exceeds a critical value....
In tokamak experiments, various magnetohydrodynamic (MHD) instabilities usually co-exist and interact with fast particles. It can cause the particles to significantly transport lose, which results in damaging first wall quenching discharge tokamak. Therefore, understanding of physical mechanism particle caused by MHD is crucial this problem needs solving urgently for steady-state long pulse operation future reactor-graded devices. According phenomenon synergy between non-resonant internal...
Experiment on suppressing fishbone activities is carried out in HL-2A tokamak by electron cyclotron resonance heating (ECRH). To achieve multiple deposition locations of ECRH, the magnetic field a range 1.22–1.4 T from shot to shot. It found that modes exhibit different characteristics at radial locations. With same injected power, effect off-axis ECRH much better than on-axis heating. The can be completely suppressed when deposited nearby <i>q</i> = 1 rational surface, but would...
On October 24, 2021, the Chinese government unveiled a guiding document about state-level work to achieve carbon peaking and neutrality goals under new development philosophy, laying out key targets measures for upcoming decades. The documment, titled “Working Guidance For Carbon Dioxide Peaking Neutrality In Fully And Faithful Implementation Of New Development Philosophy.” stated that China's dioxide emissions per unit GDP would have dropped by 18% from level in 2020 2025 more than 68% 2005...