A5085141196- Magnetic confinement fusion research
- Fusion materials and technologies
- Ionosphere and magnetosphere dynamics
- Laser-Plasma Interactions and Diagnostics
- Superconducting Materials and Applications
- Laser-induced spectroscopy and plasma
- Particle accelerators and beam dynamics
- Atomic and Molecular Physics
- Plasma Diagnostics and Applications
- Water Resources and Sustainability
- Physics of Superconductivity and Magnetism
- Software Engineering Research
- Tropical and Extratropical Cyclones Research
- Software Reliability and Analysis Research
- Regional Development and Environment
- Software System Performance and Reliability
- Nuclear reactor physics and engineering
- Sustainability and Ecological Systems Analysis
- Land Use and Ecosystem Services
Hebei Agricultural University
2024
Southeast University
2024
Southwestern Institute of Physics
2013-2020
National Institute for Fusion Science
2013
Logging, which aims to determine the position of logging statements, verbosity levels, and log messages, is a crucial process for software reliability enhancement. In recent years, numerous automatic tools have been designed assist developers in one tasks (e.g., providing suggestions on whether try-catch blocks). These are useful certain situations yet cannot provide comprehensive solution general. Moreover, although research has started explore end-to-end logging, it still largely...
A 2D electron cyclotron emission imaging (ECEI) system has been developed for measurement of temperature fluctuations in the HL-2A tokamak. It is comprised a front-end 24 channel heterodyne array with tunable RF range spanning 75-110 GHz, and set back-end ECEI electronics that together generate × 8 = 192 images 2nd harmonic X-mode from plasma. The simulated performance local oscillator (LO) optics radio frequency (RF) presented, laboratory characterization results. Gaussian beams LO are...
Edge impurity transport has been investigated in the stochastic layer of Large Helical Device (LHD) and scrape-off (SOL) Huan Liuqi-2A (HL-2A) tokamak, as a comparative analysis based on three-dimensional (3D) edge code EMC3-EIRENE carbon emission profile measurement.The 3D simulation predicts screening effect both devices, but also different behavior against collisionality source location between two devices.The difference is caused by geometrical structures magnetic field lines X-point...
The frequency modulated continuous wave reflectometer was developed for the first time on HL-2A tokamak. system utilizes a voltage controlled oscillator and an active multiplier broadband coverage detects as heterodyne mode. Three reflectometers have been installed operated in extraordinary mode polarization to measure density profiles at low field side, covering Q-band (33-50 GHz), V-band (50-75 W-band (75-110 GHz). For profile reconstruction from phase shift of probing wave, corrected...
Edge impurity transport is studied in electron cyclotron resonance heating (ECRH) L-mode plasmas of the HL-2A tokamak based on space-resolved vacuum ultraviolet spectroscopy with which radial profiles line emissions are measured from core region inside last closed flux surface (LCFS) and edge scrape-off layer, simultaneously. The profile carbon C V (2271 Å: 1s2s 3S–1s2p 3P) reconstructed into local emissivity analysed a one-dimensional code, diffusion coefficient convective velocity ions...
In HL-2A, an inverse sawtooth oscillation is observed with a long-lasting m/n = 1/1 mode during ECRH phase power deposition inside inversion radius (inner-deposited ECRH), while normal instead appears when the deposited outside (outer-deposited ECRH). Aluminum then injected as trace impurity laser blow-off (LBO) method into inner- and outer-deposited phases of HL-2A discharges to investigate effect on transport. Temporal behavior soft x-ray (SXR) array signals analyzed 1D transport code,...
In recent experiments at the HL-2A tokamak, dynamic features across low–intermediate–high (L–I–H) confinement transition have been investigated in detail. Experimental evidence shows two types of opposite limit cycles (dubbed type-Y and type-J) between radial electric field (Er) turbulence evolution during intermediate I-phase. Whereas for grows prior to change Er, type-J oscillation Er leads turbulence. It has found that usually appears first after an L–I transition, followed by before...
In recent experiments of the HL-2A tokamak, effect on pedestal dynamics by plasma fuelling with supersonic molecular beam injection (SMBI) has been intensively investigated. Experimental results in several tokamaks suggested that SMBI is a promising technique for ELM mitigation. addition to fuelling, impact impurities and instabilities investigated HL-2A. have shown during H-mode phase, broadband electromagnetic (EM) turbulence was driven peaked impurity density profile at edge region,...
Impurity transport in the scrape-off layer (SOL) has been studied ohmically heated discharges of HL-2A tokamak based on space-resolved vacuum ultraviolet spectroscopy. The vertical profile (from plasma center to lower X-point) carbon emissions CIII (977 Å: 2s2 1S0-2s2p ) and CIV (1548 2s 2S-2p 2P) as well ratio were measured investigate edge impurity with relation source locations sputtering characteristics. experimental result shows that SOL clearly changed against different locations....
Geodesic acoustic mode (GAM) and low-frequency zonal flow (LFZF) are both observed through Langmuir probe arrays during electron cyclotron resonance heating (ECRH) on the HL-2A tokamak edge. The radial distributions of amplitude peak frequency GAM in floating potential fluctuations investigated rake under different ECRH powers. It is that would decrease intensity carbon line emission increase as power exceeds a certain threshold. analyses suggest impurity ions may play an important role at...
Correlation Doppler reflectometers have been newly developed in the HL-2A Tokamak. Owing to flexibility of diagnostic arrangements, multi-channel systems allow us study, simultaneously, radial properties edge turbulence and its long-range correlation both poloidal toroidal direction. With these reflectometers, three-dimensional spatial structure Geodesic Acoustic Mode (GAM) is surveyed, including symmetric feature Er fluctuations directions, propagation GAMs. The bi-coherence analysis for...
Ecological importance evaluation can clearly identify the ecological service functions and values of a region. This paper takes Yanshan-Taihang Mountain area in Hebei Province as research area, utilizing 2020 land use data. With help various analytical models GIS spatial analysis methods, this selects water conservation, soil biodiversity, carbon sequestration oxygen release to evaluate ecosystem services, loss sensitivity desertification sensitivity, so important areas protection study...
Abstract Tungsten ion densities are determined by measuring radial profiles of line emissions in LHD. Zn-(W 44+ ) and Cu-like (W 45+ from emission at 60.9 Å 127.0 Å, respectively. Ion W 24+ , 25+ 26+ also tungsten pseudo-continuum (a so-called unresolved transition array (UTA)) 29-33 Å. Observations magnetic dipole (M1) forbidden lines 3377Å enable evaluation the density 27+ . In EAST tokamak concentration is estimated a combination UTA total radiation loss. HL-2A influx evaluated 6+ ions...