A5101448650- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Fusion materials and technologies
- Laser-Plasma Interactions and Diagnostics
- Ionosphere and magnetosphere dynamics
- Gyrotron and Vacuum Electronics Research
- Plasma Diagnostics and Applications
- Microwave Engineering and Waveguides
- Superconducting Materials and Applications
- Chinese history and philosophy
- Advanced Fiber Laser Technologies
- Nonlinear Photonic Systems
- Nuclear Physics and Applications
- China's Socioeconomic Reforms and Governance
- Photonic and Optical Devices
- Educational Innovations and Challenges
- Medical Research and Treatments
- Head and Neck Cancer Studies
- Fuel Cells and Related Materials
- Laser-induced spectroscopy and plasma
- Water Quality Monitoring Technologies
- Nonlinear Dynamics and Pattern Formation
- Laser-Matter Interactions and Applications
- Angiogenesis and VEGF in Cancer
- Foreign Language Teaching Methods
Southwestern Institute of Physics
2008-2024
Xiangya Hospital Central South University
2024
Wuhan Institute of Technology
2024
Central South University
2024
Beijing Vaccum Electronic Research Institute
2019-2023
Sichuan University
2016-2019
Shaanxi University of Science and Technology
2008
Intervertebral disc degeneration (IVDD) can be caused by aging, injury, and genetic factors. The pathological changes associated with IVDD include the excessive accumulation of reactive oxygen species (ROS), cellular pyroptosis, extracellular matrix (ECM) degradation. There are currently no approved specific molecular therapies for IVDD. In this study, we developed a multifunctional microenvironment-responsive metal-phenolic network release platform, termed TMP@Alg-PBA/PVA, which could treat...
During the current flat-top phase of electron cyclotron resonance heating discharges in HL-2A Tokamak, behaviour runaway electrons has been studied by means hard x-ray detectors and neutron diagnostics. heating, it can be found that both radiation intensity emission flux fall rapidly to a very low level, which suggests have suppressed heating. From set present experiments, also observed efficiency suppression was apparently affected two factors: power duration. These results analysed using...
The features of ion and electron fishbone instabilities have been investigated during neutral beam injection (NBI) cyclotron resonance heating (ECRH) on HL-2A. Some new phenomena, such as frequency jumps V-font-style sweeping, presented in the paper. Three kinds i-fishbones, including hybrid sawtooth–fishbone (sawbone), run-on classical fishbone, identified NBI. During high power ( P ECRH > 0.7 MW) ECRH, experimental results indicate that e-fishbone frequencies are higher than those low...
The β-induced Alfvén eigenmode (BAE) excited by energetic electrons has been identified for the first time both in Ohmic and electron cyclotron resonance heating plasma HL-2A. features of instability, including its frequency, mode number, propagation direction, can be observed magnetic pickup probes. frequency is comparable to that continuum accumulation point lowest gap induced shear continuous spectrum due finite β effect, it proportional velocity at thermal ion held constant. experimental...
Abstract Density profiles in the pedestal region (H-mode) are measured HL-2A and characteristics of density described. Cold particle deposition by supersonic molecular beam injection (SMBI) within is verified. Edge-localized mode (ELM) mitigation SMBI into H-mode demonstrated relevant physics elucidated. The sensitivity effect to pressure duration studied. Following SMBI, ELM frequency increases amplitude decreases for a finite duration. Increases <?CDATA $f_{{\rm ELM}}^{{\rm SMBI}} /f_{{\rm...
Efficient and cost-effective recovery technologies are needed to harvest the abundant energy stored in low-grade heat sources (＜ 100 °C). Thermally regenerative electrochemical cycle (TREC) is a promising approach for...
Typical ELMy H-mode discharges have been achieved on the HL-2A tokamak with combined auxiliary heating of NBI and ECRH. The minimum power required is about 1.1 MW at a density 1.6 × 1019 m−3 increases decrease in density, almost independent launching order ECRH heating. energy loss by each edge localized mode (ELM) burst estimated to be lower than 3% total stored energy. At frequency typically 400 Hz, confinement time only marginally reduced ELMs. supersonic molecular beam injection fuelling...
Significant experimental advances have been made on the HL-2A tokamak along with substantial improvement and development of hardware. A spontaneous particle transport barrier has observed in Ohmic discharges without any external momentum input. The was evidenced by a density perturbation study using modulated supersonic molecular beam injection (SMBI) microwave reflectometry. new features non-local effect induced SMBI analysed. three-dimensional spectral structures low frequency zonal flow,...
A strong burst of the internal kink mode has been observed during ECRH on HL-2A. It experimentally identified that energetic electrons, which deviate from Maxwell velocity distribution, excite mode, was a so-called electron fishbone (e-fishbone). The energy distribution electrons is indirectly measured by hard x-ray detector (CdTe) with pulse height analysis. When counts 35–70 keV increase to higher level, can be obviously observed. e-fishbone excited off-axis deposited both high field side...
Beta-induced Alfvén eigenmode (BAE) during a strong tearing mode activity (termed as m-BAE) has been observed and investigated in HL-2A. BAE excited by energetic electrons e-BAE) identified both the Ohmic ECRH plasma. The hard x-ray spectrum detected cadmium telluride non-thermal radiation measured electron cyclotron emission are used to analyse behaviour of electrons. Experimental results show that e-BAE is related not only populations electrons, but also their energy distribution. An...
The physics experiments on the HL-2A tokamak have been focused confinement improvement, particle and thermal transport, zonal flow turbulence, filament characteristics, energetic induced modes plasma fuelling efficiency since 2008. ELMy H-mode discharges are achieved in a lower density regime using combination of NBI heating with ECRH. power threshold is found to increase decrease density, almost independent launching order ECRH power. pedestal profiles measured. outward convection observed...
Abstract Features of high fuelling efficiency supersonic molecular beam injection (SMBI) are studied on the HL-2A tokamak. Normalized by fuelled particle inventory, D α emission induced SMBI is about 50% higher than that gas puffing (GP), indicating a percentage fuel injected will enter plasma. Strong convection (inward pinch) observed with hydrogen cyanide (HCN) interferometer as densities from core and edge channels increase decrease, respectively, in post-fuelling phase. In addition,...
In this paper, an overview of the magnetohydrodynamic instabilities induced by energetic electrons on HL-2A is given and some new phenomena with high-power electron cyclotron resonance heating (ECRH) are presented. A toroidal Alfvén eigenmode frequency from 200 to 350 kHz identified during powerful ECRH. lower range 10 35 kHz, which in beta-induced range, coexistence multi-mode found ECRH for first time. The spectra become wide when power sufficiently high. frequencies modes increase much...
The first plasmas have been achieved in the HL-2M tokamak by fulfilling usual criteria for plasma breakdown, i.e. optimal working gas pressure, field null configuration of poloidal magnetic field, reasonable toroidal electrical and clean wall conditions. characterization initiation, such as identification initiation time position, is performed diagnostic data analysis numerical simulation. A model-based method, which enables dedicated pick-up sensors to estimate radial position real time,...
Polarizers are widely used to change the polarization of millimeter waves on electron cyclotron resonance heating and current drive (ECRH CD) systems. A new method based coordinate transformation Fourier expansion (the so-called C-method) has been developed for design polarizers HL-2A ECRH CD This transforms grating problem an eigenvalue problem, making it easy clear understand solve. The comparison between C-method, integral method, low power test results is presented. It indicates that...
Qualitatively novel results on non-locality phenomena in perturbative transport experiments are reported. Here, means a rapid response the core follows an edge perturbation time scale far shorter than any standard approximation to global, diffusive model confinement time. Sequential firing of supersonic molecular beam injection HL-2A tokamak sustained increase temperature perturbation. O-mode reflectometers introduced measure density fluctuations and show that central turbulence is...
Physics related to fast electrons in lower hybrid (LH) current drive (LHCD) plasma is a very important issue, since these particles will play an role runaway electron (RE) generation and wave (LHW)-related physics. Utilizing new hard X-ray (HXR) pinhole camera, recent HL-2A tokamak experiments have devoted enhancing the understanding of physics on LHW. The bremsstrahlung (FEB) emission HXR energy range between 20 200 keV was measured by camera. To study conversion LHW-produced into REs,...
A fast electron bremsstrahlung (FEB) diagnostic technique based on cadmium telluride (CdTe) detector has been developed recently in the HL-2A tokamak for measurements of temporal evolution FEB emission energy range 10-200 keV. With a perpendicular viewing into plasma equatorial plane, hard x-ray spectra with eight different channels are measured. The discrimination is implemented by an accurate spectrometry. system also makes use digitization and software signal processing technology. An...
Fishbone instability excited by energetic electrons during electron cyclotron resonant heating (ECRH) is identified on HL-2A. With high-power ECRH, periodic frequency jump phenomena are observed soft x-ray arrays. Soft tomography shows that the poloidal and toroidal mode numbers 1/1 2/2 with jump. There an ECRH power threshold for phenomena, which generally about 0.9 MW. The frequencies of two modes increase power. Experiments show trapped particles dominant in low-density plasma....
For the first time, edge-localized mode (ELM)-free H-mode was realized in HL-2A tokamak by using electron cyclotron resonance heating and co-current neutral beam injection (NBI) heating. This ELM-free is associated with formation of edge particle transport barrier, an increase density peaking a significant decrease turbulence. During stationary phase, magnetohydrodynamic identified, which has similar characteristics to harmonic oscillation (EHO), as observed other tokamaks. EHO-like enhances...
In order to provide more capability of physics study for high-performance plasma, such as current profile control, neoclassical tearing modes suppression, transport and so on, a new 2MW/140GHz/3s second-harmonic ECRH system with X-mode injection is on schedule HL-2A. The total power this 2MW the pulse duration 3 sec, which generated by two gyrotrons manufactured GYCOM. Two evacuated Φ63.5mm transmission lines were used propagate these 1MW/3s wave beams. A fast steerable launcher has been...
A hard X-ray pinhole camera system has been recently built at the HL-2A tokamak to measure evolution of space-time distribution fast electrons in energy range 20 200 keV. The is mainly composed a fan-shaped detector array, an observation window, mechanism, and data processing system. array consists 21 CdTe detectors that are arranged poloidal section. views plasma perpendicularly through window mounted horizontal port on equatorial plane. implemented by spectrometry based field-programmable...
The gas density of the supersonic molecular beam (SMB) is a crucial parameter for fueling or diagnostic process in tokamak experiments. Using microphone, one improved method measurement proposed, which can greatly improve capacity by about 3 orders magnitude studying pulsed signal characteristic microphone when it pushed SMB. SMB measured within axial range 20–2000 mm, and central at 2000 mm 100 times less than that 20 mm. It also found radial distribution follows Gaussian function both free...