A5089679164- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Superconducting Materials and Applications
- Plasma Diagnostics and Applications
- Plasma Applications and Diagnostics
- Laser-Plasma Interactions and Diagnostics
- Fusion materials and technologies
- Particle accelerators and beam dynamics
- Solar and Space Plasma Dynamics
- Aerosol Filtration and Electrostatic Precipitation
- Advanced ceramic materials synthesis
- Dust and Plasma Wave Phenomena
- Electrohydrodynamics and Fluid Dynamics
- Electromagnetic Scattering and Analysis
- Electromagnetic Simulation and Numerical Methods
- Aluminum Alloys Composites Properties
- Physics of Superconductivity and Magnetism
- Lightning and Electromagnetic Phenomena
- High-Velocity Impact and Material Behavior
- Advanced materials and composites
- Nuclear reactor physics and engineering
- High-pressure geophysics and materials
- Robotic Locomotion and Control
- Numerical methods in engineering
- Vehicle Routing Optimization Methods
Beijing Institute of Technology
2023-2025
Xuzhou Medical College
2025
Huazhong University of Science and Technology
2015-2024
Fusion Academy
2022
Fusion (United States)
2022
Imperial College London
2020
Chengdu University
2018-2019
Chinese Academy of Sciences
2003-2019
Institute of Plasma Physics
2019
State Key Laboratory of Advanced Electromagnetic Engineering and Technology
2016
A single electrode room-temperature atmospheric pressure plasma plume generated between a high-voltage and the surrounding room air is reported. The has peak current of about 360mA. This highest carried by ever rotational vibrational temperature 300 2950K, respectively. Emission spectra show that excited species, such as O, OH, N2+, etc., are present in plume.
The roles of various plasma agents in the inactivation bacteria have recently been investigated. However, up to now, effect charged particles on is not well understood. In this paper, an atmospheric pressure jet device, which generates a cold plume carrying peak current 300 mA, used investigate role process. It found that play minor process when He/N2(3%) as working gas. On other hand, He/O2(3%) used, are expected important bacteria. Further analysis shows negative ions O2− might be playing...
In this letter, a room temperature atmospheric pressure plasma jet device is reported. The high voltage electrode of the covered by quartz tube with one end closed. device, which driven kilohertz ac power supply, capable generating plume up to 11cm long in surrounding air. rotational and vibrational temperatures are 300 2300K, respectively. A simple electrical model shows that, when contacted human, drop on human less than 66V for applied 5kV (rms).
Abstract Recent J-TEXT research has highlighted the significance of role that non-axisymmetric magnetic perturbations, so called three-dimensional (3D) perturbation (MP) fields, play in a fundamentally 2D concept, i.e. tokamaks. This paper presents results achieved over last two years, especially on impacts 3D MP fields magnetohydrodynamic instabilities, plasma disruptions and turbulence transport. On J-TEXT, resonant (RMP) system, capable providing either static or high frequency (up to 8...
Rather than using noble gas, room air is used as the working gas for an atmospheric pressure room-temperature plasma. The plasma driven by submicrosecond pulsed directed current voltages. Several spikes appear periodically each voltage pulse. first spike has a peak value of more 1.5 A with pulse width about 10 ns. Emission spectra show that besides excited OH, O, N2(C–B), and N2+(B–X) emission, NO, N2(B–A), H, even N emission are also observed in plasma, which indicates may be reactive...
The effects of various discharge parameters and ambient gas on the length He atmospheric plasma jet plumes expanding into open air are studied. It is found that voltage width discharge-sustaining pulses exert significantly stronger plume than pulse frequency, flow rate, nozzle diameter. This result explained through detailed analysis I-V characteristics primary secondary discharges which reveals major role integrated total charges in dynamics. can be increased by guiding propagating a glass...
The J-TEXT tokamak has been operated for ten years since its first plasma obtained at the end of 2007. diagnostics development and main modulation systems, i.e. resonant magnetic perturbation (RMP) systems massive gas injection (MGI) will be introduced in this paper. Supported by these efforts, contributed to research on several topics, especially RMP physics disruption mitigation. Both experimental theoretical show that could lock, suppress or excite tearing modes, depending amplitude,...
Abstract In the last two years, three major technical improvements have been made on J-TEXT in supporting of expanded operation regions and diagnostic capabilities. (1) The successful commission 105 GHz/500 kW/1 s electron cyclotron resonance heating (ECRH) system increasing core temperature from 0.9 keV up to around 1.5 keV. (2) poloidal divertor configuration with an X -point high-field side has achieved. particular, 400 kW wave also successfully injected into diverted plasma. (3) A...
The “plasma bullet” behavior of atmospheric pressure plasma plumes has recently attracted significant interest. In this paper, a specially designed jet device is used to study phenomenon. It found that helium primary can propagate through the wall dielectric tube and keep propagating inside (secondary plasma). High-speed photographs show disappears before secondary starts propagate. Both at hypersonic speed. Detailed studies on dynamics local electric field induced by charges surface plays...
Abstract The J-TEXT capability is enhanced compared to two years ago with several upgrades of its diagnostics and the increase electron cyclotron resonance heating (ECRH) power 1 MW. With application wave (ECW), ECW assisted plasma startup achieved; tearing mode suppressed; toroidal injection 300 kW drives around 24 kA current; fast electrons are generated injected runaway current conversion efficiency increases ECRH power. coupling between 2/1 3/1 modes extensively studied. coupled usually...
It has recently been demonstrated that pulsed direct-current (dc) voltages show better performance in generating diffuse plasmas under various conditions. However, it still remains unclear whether the pulsewidth or rising and falling times of voltage pulse play essential role improvement dielectric barrier discharges (DBDs). In this paper, we focus on effect pulsewidth. Pulsed dc with varying from 0.2 mus to about 1 ms are used drive DBDs. High-speed photographs Ar can be generated by...
The C/SiC composite is one of the most promising materials for applications in aerospace sector. thermal-mechanical-chemical coupling environment significantly influences mechanical properties composite. However, high-temperature atmosphere, fixture susceptible to damage, sample softens, and slag removed, resulting difficulties developing stress-oxidized experiments characterizing oxidation behavior In this study, a new characterization parameter, oxidized volume rate per unit time, was...
Abstract A large number of runaway electrons (REs) generated during disruption will cause huge damage on next generation large-scale tokamak. The influence three-dimensional (3D) helical magnetic perturbations the suppression REs has been explored by a set 3D coils in J-TEXT tokamak, which can excite m/n = −2/2 perturbations. Experimental evidence shows that caused opposite coil current direct plasma towards high field side, simultaneously enhancing fluctuations, would enhance radial loss...
The phenomena of island healing and configuration transition induced by high-power electron cyclotron resonance heating (ECRH) have been investigated in the divertor on J-TEXT tokamak. Experimental results reveal that size edge open magnetic with mode number m/n = 3/1 decreases substantially under specific ECRH conditions. This process, referred to as healing, occurs when a power 500~600 kW is deposited plasma core or 250 at r 0.5 a, where minor radius. reduction width makes ineffective into...
Abstract The phenomena of island healing and configuration transition induced by high-power electron cyclotron resonance heating (ECRH) have been investigated in the divertor on J-TEXT tokamak. Experimental results reveal that size edge open magnetic with mode number m/n = 3/1 decreases substantially under specific ECRH conditions. This process, referred to as healing, occurs when a power 500~600 kW is deposited plasma core or 250 at r_EC 0.5 a, where minor radius. reduction width makes...
The aim of this study was to evaluate the clinical outcomes three surgical methods, types arthroscopic suture fixation, suspension fixation with EndoButton, and open screw in treatment displaced posterior cruciate ligament tibial insertion avulsion fractures. A retrospective analysis data 104 patients fractures between 2010 2023 performed. were divided into groups according approach used: Group (24 patients), EndoButton B (37 hollow C (43 patients). Lysholm score, International Knee...
The propagation of an electromagnetic wave in atmospheric pressure plasma (APP) layer is described numerically with integral-differential equation. When the passes through APP layer, amplitude and phase transmission electric field are obviously modulated by electron density collision frequency between electrons neutrals APP. dependences behaviors, such as shift, coefficient transmission, reflection absorption, on these characteristics presented. Appleton’s equation derived from...
Dynamics of atmospheric-pressure plasma plumes have recently attracted significant attentions. However, the nature ldquoplasma bulletrdquo behavior is still not clearly understood. The bullets some feature a cathode-directed streamer. there are several notable differences between streamerlike and streamers. One repeatability (reproducible in time space) two types discharges. All reports on bullet suggested that very repeatable. This different with streamers, which typically unrepeatable due...
Disruptions have the possibility of causing severe wall damage to large tokamaks like ITER. The mitigation disruption is essential safe operation a large-scale tokamak. shattered pellet injection (SPI) technique, which regarded as primary method for ITER, presents several advantages relative massive gas injection, including more rapid particle delivery, higher total assimilation, and centrally peaked deposition. A dedicated argon SPI system that focuses on runaway current dissipation has...
The mitigation of disruption damage is essential to the safe operation a large-scale tokamak. In order achieve ITER, shattered pellet injection (SPI) has been considered as primary measure mitigation. A dedicated argon SPI system, focusing on designed for J-TEXT pure can be formed in freezing tube, then separated from tube and accelerated by punch mechanism. injected with speed 150–300 m s−1. performance Ar compared massive gas (MGI). cooling process observed ECE indicates that deeper...
Abstract On the J-TEXT tokamak, dynamics of edge magnetic topology during opening islands induced by external Resonant Magnetic Perturbation (RMP) are investigated. The island chain is pushed outward increasing plasma toroidal current to intersect poloidally and toroidally localized divertor plate, forming an open in Scrape-Off Layer (SOL). location strike points on plate predicted HINT code agreement with experimental observations. influence profiles has also been investigated using...
Cold plasmas have recently received great attention. In this paper, optical and electrical diagnostics are carried out on a reliable user-friendly plasma plume. A simple model is used to simulate the characteristics of device. The represented by resistor connected in parallel with capacitor, an inductor, another resistor, which series. simulated current-voltage waveforms very good agreement experimental measurements. Besides, emission spectra also studied. It shows that, when Ar as working...
This work presents the impact that multiple island chains co-existent across a tokamak plasma profile have on heat transport and final temperature of plasma. Numerical studies using TM1 code show error fields (EFs) with poloidal components accelerate core field penetration compared to pure m/ n = 2/1 EF (here m are toroidal mode numbers respectively). After penetration, locked magnetic islands 2/1, 3/1 4/1 flatten at corresponding rational surfaces. The co-existence these significantly...
Most state-of-the-art bipedal robots are designed to be anthropomorphic and therefore possess legs with knees. Whilst this facilitates more human-like locomotion, there implementation issues that make walking straight or near-straight difficult. have move a constant bend in the avoid singularities at knee joints, keep centre of mass height for control purposes. Furthermore, having on leg increases design complexity as well weight leg, hindering robot's performance agile behaviours such...