A5051994829- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Laser-Plasma Interactions and Diagnostics
- Fusion materials and technologies
- Particle accelerators and beam dynamics
- Fluid Dynamics and Turbulent Flows
- Gas Dynamics and Kinetic Theory
- Physics of Superconductivity and Magnetism
- Superconducting Materials and Applications
- Laser-induced spectroscopy and plasma
- Geomagnetism and Paleomagnetism Studies
- Plasma Diagnostics and Applications
- Dust and Plasma Wave Phenomena
- High-pressure geophysics and materials
- Meteorological Phenomena and Simulations
- Healthcare and Venom Research
- Computational Fluid Dynamics and Aerodynamics
- Oceanographic and Atmospheric Processes
- Heusler alloys: electronic and magnetic properties
- Ocean Waves and Remote Sensing
- Radiation Detection and Scintillator Technologies
- Acupuncture Treatment Research Studies
- 2D Materials and Applications
- Semiconductor Lasers and Optical Devices
Southwestern Institute of Physics
2007-2024
Liaoning University of Traditional Chinese Medicine
2023
East China Normal University
2020
Kyoto University
2008-2017
Matsumoto University
2009
Zhejiang University
2008-2009
Chinese Academy of Sciences
2006
Advanced Science Research Center
2002-2005
China Center of Advanced Science and Technology
1996-1999
Abstract We report on comprehensive experimental studies of turbulence spreading in edge plasmas. These demonstrate the relation and entrainment to intermittent convective density fluctuation events or bursts (i.e. blobs holes). The non-diffusive character is thus elucidated. velocity (or mean jet velocity) manifests a linear correlation with skewness fluctuations, increases auto-correlation time fluctuations. Turbulence by positive fluctuations outward, while negative inward. degree...
Abstract Self-intercalated van der Waals magnets, characterized by self-intercalating native atoms into layered structures with intrinsic magnetism, exhibit a variety of novel physical properties. Here, using first-principles calculations and Monte Carlo simulations, we report self-intercalated ferromagnet, Cr 3 Ge 2 Te 6 , which has high Curie temperature 492 K. We find that is nearly half-metallic spin polarization reaching up to 90.9%. Due the ferromagnetism strong spin-orbit coupling...
Global characteristics of the coupled system zonal flows and electromagnetic ion temperature gradient driven turbulence in tokamak plasmas are investigated using a global Landau fluid code. Zonal flow behavior changes with safety factor q. In low q region stationary excited they suppress effectively. Coupling between poloidally asymmetric pressure perturbations due to geodesic curvature makes oscillatory high region. Energy transfer from via is identified. Therefore where oscillatory, cannot...
Self-intercalated van der Waals magnets, characterized by self-intercalating native atoms into layered structures with intrinsic magnetism, exhibit a variety of novel physical properties. Here, using first-principles calculations and Monte Carlo simulations, we report self-intercalated ferromagnet, Cr$_3$Ge$_2$Te$_6$, which has high Curie temperature 492 K. We find that Cr$_3$Ge$_2$Te$_6$ is nearly half-metallic spin polarization reaching up to 90.9%. Due the ferromagnetism strong spin-orbit...
Abstract The alpha particle should have good confinement when there are instabilities and toroidal field ripple in fusion devices. With the slowing down distribution generated by TRANSP/NUBEAM, Alfven eigenfunction calculated NOVA/NOVA-K, a quasilinear model ORBIT code, study investigated nonlinear evolution of Toroidal Eigenmode (TAE) driven particles resulting transport, particularly focusing on synergistic effect with loss. amplitude level strong pulsations is about 5e-4R0 , frequency...
Abstract We report the first interpretation of ion cyclotron emission (ICE) based on frequency variation in HL-2A tokamak experiments. The measured frequencies ICE are concentrated around frequency, while simultaneously exhibiting a linear scaling with Alfvén velocity. A fully kinetic simulation demonstrates that low fast concentration, approaches wave dispersion relation. relation is similar to “equatorial noise” inner magnetosphere, providing new opportunities for comparing physical model...
The onset of abrupt magnetic reconnection events, observed in the nonlinear evolution double tearing modes (DTM), is investigated via reduced resistive magnetohydrodynamic simulations. We have identified critical threshold for parameters characterizing linear DTM stability leading to bifurcation explosive dynamics. A new type secondary instability discovered that excited once islands on each rational surface reach a structure characterized here by width and angle rating their...
The radial profiles of perpendicular flows in the presence magnetic island were firstly measured HL-2A tokamak by hopping work frequency Doppler backward scattering reflectometer system along with a two-dimensional electron cyclotron emission imaging diagnostic identifying locations. It has been observed that across O-point cut flow is quite small at center and strongly enhanced around boundary island, resulting large increase shear outer half while X-point almost flat whole region....
Background and purpose Migraine is a complex disabling neurological disorder, the exact mechanisms of which remain unclear. The thalamus considered to be hub central processing integration nociceptive information, as well modulation these processes. Methods A total 48 migraineurs without aura (MWoAs) during interictal phase age‐ sex‐matched healthy controls underwent resting‐state functional magnetic resonance imaging scans. We utilized masked independent component analysis seed‐based...
Shear flows induced by nonlinear evolution of double tearing modes are investigated in a resistive magnetohydrodynamic model with slab geometry. It is found that intensive and thin poloidal shear flow layers generated the magnetic island region driven coupled reconnection process at both rational surfaces. The structure keeps evolving after merging separatrices forms few narrow vortices along open field lines final stage reconnection. effects distance between surfaces initial on plasma also...
Abstract Since the first plasma realized in 2020, a series of key systems on HL-3 (known as HL-2M before) tokamak have been equipped/upgraded, including in-vessel components (the wall, lower divertor, and toroidal cryogenic/water-cooling/baking/glow discharge systems, etc.), auxiliary heating system 11 MW, 28 diagnostic (to measure density, electron temperature, radiation, magnetic field, etc.). Magnet field were commissioned firstly for divertor discharges. During 2nd experimental campaign...
The electron temperature gradient (ETG) driven turbulence in tokamak core plasmas is numerically investigated based on a three-dimensional gyrofluid model with adiabatic ion response. Attentions are focused the zonal flow dynamics ETG fluctuations and resultant heat transport. A high energy confinement mode found weak magnetic shear region, which relevant to self-organization behavior of through enhanced rather than stabilization fluctuations. It demonstrated that favors enhancement flows...
Turbulent transport near the critical gradient in toroidal plasmas is studied based on global Landau-fluid simulations and an extended predator-prey theoretical model of ion temperature turbulence. A new type intermittent associated with emission propagation a geodesic acoustic mode (GAM) found regime, which referred to as GAM intermittency. The intermittency characterized by time scales trigger, damping, recursion due damping. During bursts, stationary zonal flow increases slow scale...
Over the past several years, high-
Abstract Experimental studies of the dynamics shear flow and turbulence spreading at edge tokamak plasmas are reported. Scans line-averaged density plasma current carried out while approaching Greenwald limit on J-TEXT tokamak. In all scans, when fraction <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msub> <mml:mi>f</mml:mi> <mml:mtext>G</mml:mtext> </mml:mrow> </mml:msub> <mml:mo>=</mml:mo> <mml:mover> <mml:mi>n</mml:mi> <mml:mo...
Interaction between small-scale zonal flows and large-scale turbulence is investigated. The key mechanism identified as radially nonlocal mode coupling. Fluctuating energy can be nonlocally transferred from the unstable longer to stable or damped shorter wavelength region, so that spectrum seriously deformed deviates nonlinear power law structure. Three-dimensional gyrofluid ion-temperature gradient (ITG) simulations show an ion transport bursting behavior consistently linked spectral...
The double tearing mode (DTM) is characterized by two eigen states with antisymmetric or symmetric magnetic island structure, referred to as the even odd DTM. In this work, we systematically revisit DTM instabilities in presence of an shear flow a focus on eigenmode characteristics well stabilization destabilization mechanism wide parameter region. Both initial value simulation and eigenvalue analysis are performed based reduced resistive MHD model slab geometry. A degenerated state found at...
Zonal flows can be generated by drift wave turbulence through the nonlinear interactions. Three-dimensional gyrofluid simulations show that in a turbulent system driven electrostatic sheared slab electron temperature gradient (ETG) modes, excitation of zonal is slower process, which indicates amplitudes grow up approximately proportionally to time. The are very weak compared with background and hardly work for suppressing heat transport. dynamics numerically explored starting flow component...
The evolution of multi-scale plasma turbulence including resistive MHD and micro-instabilities is studied based on a 5-field slab gyrofluid simulation aiming to understand complex nonlinear interactions turbulent transport. It observed that the spatial structure mixed-scale electromagnetic characterized by power-law scaling spectrum typical perturbations, but spectral amplitude enhanced micro-instability at all scales. A robust oscillatory zonal flow (ZF) with finite frequency created in...
Turbulent fluctuations within a quasi-coherent frequency range (peak of ~ 130 kHz, ∆f ≈ tens kHz) are modulated by the rotation low tearing modes in core HL-2A ohmic plasmas. The (QCMs) emerge outside island boundary as O-point passes large cases (w > 4.5 cm), where local electron temperature profile is steepened. Statistical analysis shows that for QCM excitation, threshold value gradient identified and solely observed density discharges, consistent with linear confinement regime. These...
Oscillatory zonal flows called geodesic acoustic modes (GAMs) appearing in a high safety factor region of tokamak plasmas show nonlocal behaviour their frequency. The frequency the GAMs is unchanged over certain radial and variation step-like. effects ρ* = ρi/a on are investigated by global ion temperature gradient driven turbulence simulations, where ρi an Larmor radius minor torus. It found that width which have same almost proportional to , while wavelength ρi. As for turbulent transport,...
Formation of secondary large-scale structures in electron temperature gradient (ETG) driven turbulence is investigated based on modeling analyses and three-dimensional gyrofluid simulations. What state the system evolves to, zonal flow dominated or streamerlike, depends spectral anisotropy ETG turbulence. The radially elongated turbulent fluctuation tends to excite a instability, while poloidally one favors enhance streamer formation. magnetic shear identified play key role structure...
The nonlinear evolution of the resistive tearing mode exhibits an abrupt growth after X-point collapse once magnetic island exceeds a certain critical width Δ′wc for large instability parameter Δ′, leading to current sheet formation [N. F. Loureiro et al., Phys. Rev. Lett. 95, 235003 (2005)]. In this work, we investigate underlying mechanism as well including viscosity effects, based on secondary analysis. is excited due quasilinear modification by zonal current. particular, it identified...