A5003520691- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Fusion materials and technologies
- Physics of Superconductivity and Magnetism
- Solar and Space Plasma Dynamics
- Robotics and Sensor-Based Localization
- Atomic and Molecular Physics
- Laser-Plasma Interactions and Diagnostics
- Nuclear reactor physics and engineering
- Metallurgical Processes and Thermodynamics
- Magneto-Optical Properties and Applications
- Millimeter-Wave Propagation and Modeling
- Optical Wireless Communication Technologies
- Nanoplatforms for cancer theranostics
- Medical Imaging and Analysis
- Visual Attention and Saliency Detection
- Dust and Plasma Wave Phenomena
- Advanced Optical Sensing Technologies
- Advanced Nanomaterials in Catalysis
- Laser Design and Applications
- Advanced machining processes and optimization
- Mosquito-borne diseases and control
- Wind and Air Flow Studies
Forschungszentrum Jülich
2022-2024
Wenzhou Medical University
2024
Chongqing University
2024
Brunel University of London
2024
Shenzhen University
2016-2023
Chinese Academy of Sciences
2016-2023
Chang'an University
2023
Jangan University
2023
University of Science and Technology of China
2018-2021
Institute of Plasma Physics
2016-2021
Abstract The estimation of the poloidal velocity turbulence and mean flow are important quantities for study sheared flows on transport. depends underlying model turbulence. Beside propagation time turbulence, its decay with fading must be considered. For description propagation, elliptical approach is applied, which takes into account has been applied successfully in experimental fluid dynamics confirmed by direct numerical simulations, also.
In this paper, analysis density...
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...
A coherent mode (CM) in the edge pedestal region has been observed on different fluctuation quantities, including density fluctuation, electron temperature and magnetic H plasma Experimental Advanced Superconducting Tokamak (EAST) tokamak. Measurements at poloidal positions show that local wavenumber is smallest outboard midplane will increase with angle. This asymmetry consistent flute-like assumption (i.e. k// ~ 0) from which toroidal number of estimated as between 12 17. It was further...
Imitating the visual characteristics of human eyes is one important tasks digital image processing and computer vision. Feature correspondence humanoid-eye binocular images a prerequisite for obtaining fused image. Human are more sensitive to edge, because it contains much information. However, existing matching methods usually fail in producing enough edge corresponding pairs viewpoint view direction differences. To this end, we propose novel effective feature algorithm based on points. The...
An ordinary-mode polarized multi-channel correlation reflectometer has been developed on the Experimental Advanced Superconducting Tokamak (EAST). The system with four different probing frequencies (i.e., 20.4 GHz, 24.8 33 and 40 GHz) two poloidally spaced receiving antennas can realize both radial measurement poloidal measurement. These diagnostics focus of density fluctuation in pedestal region to investigate turbulence transport H-mode physics EAST. In this article, hardware design, key...
The double tearing mode (DTM) in a high βN (βN > 1.5) discharge with internal transport barrier on EAST was investigated. A 15 kHz (TM) (m ≥ 3, n = 3) appears at outer q 2 surface first, which is stable the phase. Then TM 2, 1) occurs inner surface. Soon after, collapsed crash of ELM, and DTM formed during collapse βN. positions two islands are consistent temperature fluctuations strongest between magnetic islands. statistical analysis discharges operating reversed shear configuration...
Abstract The localized coupling among geodesic acoustic mode (GAM), tearing modes (TMs) and twin counter-propagating beta-induced Alfvén eigenmodes (BAEs) waves has been investigated in the experimental advanced superconducting tokamak. Before appearance of TMs, typical continuous GAM is observed through multi-channel Doppler backscattering (DBS) diagnostic. BAEs can be excited after burst magnetic islands, which are to q = 4 rational surface that confirmed by measurement DBS array, where...
The dependence of ELM frequency on heating power has been studied the Experimental Advanced Superconducting Tokamak (EAST). It is found that (fELM) generally increases with through separatrix (Psep), indicating type-I in these plasmas. However, there are two data points, named 'abnormal ELM' present paper, which have much lower fELM than 'normal ELM', while both types similar energy losses. occurs at a phase increased radiation due to metal impurity influx events. cannot explain for since...
Abstract The pedestal structure of the high-confinement mode (H-mode) operation strongly impacts global confinement and fusion performance in tokamak devices. Studies also play an important role better understanding characterization H-mode plasma discharges with type-I edge localized modes on Experimental Advanced Superconducting Tokamak (EAST). EPED model has been widely validated to predict several mean width <?CDATA ${{{\Delta }}_\psi }$?> <mml:math...
Abstract The dynamics of electron-internal transport barrier (e-ITB) formation is studied in the hybrid plasma neutral beam injection and lower wave heating on EAST. e-ITB observed to be repetitively formed at H–L transition, where relaxation process core radiation triggers an increase neutron yield electron temperature. A reversed q -profile beneficial for generating barrier, identified by appearance shear Alfvén eigenmodes (RSAEs). dimensionless parameter normalized Larmor radius <?CDATA...
A high frequency (HF) density fluctuation, ranging from 100 kHz to 400 kHz, is locally destabilized with an m/n = 1/1 internal kink mode before a sawtooth crash in the experimental advanced superconducting tokamak (EAST). The location just around region electron pressure gradient due flux compression mode. And this HF fluctuation can be triggered at both low field side and side. This has poloidal wave number (kθ) 3 5 cm−1, corresponding (m) of 36–60. threshold local (|∇p e|) exists for...
A new multi-channel poloidal correlation reflectometry is developed at Experimental Advanced Superconducting Tokamak. Eight dielectric resonator oscillators with frequencies of 12.5 GHz, 13.5 14.5 15 15.5 16 17 and 18 GHz are used as sources. Signals from the sources up-converted to V band using active quadruplers then coupled together. The output waves launched by one single antenna after passing through a 20 dB directional coupler which can provide reference signal. Two poloidally...
Abstract The influence of plasma beta effects on the edge transport in Wendelstein 7-X standard configuration is studied systematically by using EMC3-EIRENE combined with a 3D equilibrium code named HINT. magnetic topology changes induced are significantly reflected behaviors and heat flux patterns divertor targets. After validating modeling strategy comparisons experimental data, extended simulations for high performance plasmas show that threshold separatrix density accessing power...
The reflectometry on Experimental Advanced Superconducting Tokamak (EAST) is undergoing an upgrade for more comprehensive measurement of plasma density profile and fluctuation. Data Acquisition Control System (DACS) has been redeveloped to satisfy the requirements upgraded reflectometry. works in 30-110 GHz (X-mode) 40-90GHz (O-mode), when fluctuation operates at 20 fixed frequency points 50-110GHz 20-60GHz (O-mode). PXIe-based DACS includes two 8-channel 14-bit 250MSPS digitizers ten 12-bit...
Abstract An eight-channel poloidal correlation reflectometer (PCR) with O-mode polarization has been installed in the EAST tokamak to measure fluctuations from core edge. The PCR launches eight different frequency microwaves (20.4, 24.8, 33, 40, 42.4, 48, 52.6, 57.2 GHz) into plasma low field side and two poloidally separated antennae are used receive reflected waves. As a result, diagnostic can (radial)× (poloidal) spatial positions. applied study edge pedestal during an inter-ELM phase...
An X-mode polarized W-band multi-channel correlation reflectometry is installed on the Experimental Advanced Superconducting Tokamak (EAST). The with two poloidally spaced receiving antennas works at four different probing frequencies (i.e. 79.2 GHz, 85.2 91.8 96 GHz), which enables measurement of density fluctuation 4 (radial) × 2 (poloidal) spatial points. diagnostics applied to observe and turbulence perpendicular velocity in plasma core EAST. detailed description initial experimental...
Abstract Experiments conducted on the J-TEXT tokamak have provided first evidence that Beta-induced Alfvén Eigenmode (BAE) is localized inside isolated helical flux tube of its edge m / n = 3/1 magnetic island. The observations show BAE forms a standing wave island, with nodes located at X- and O-points When island cut open by contact limiter plates, found to remain remnant closed in Scrape-Off Layer, but amplitude decreases as width becomes smaller.
A cross-scale interaction between a kink instability with toroidal mode number (n) of 1 and background microturbulence (mainly coherent n = 12–17) has been observed in the H-mode edge pedestal region EAST tokamak. The frequency ~3.5 kHz is localized region. amplitude evidently modulated at mode. This modulation mainly for fluctuation component less than 100 kHz, while no by larger kHz. implies that not due to Doppler shift effect. further analysis shows could be attributed local temperature...
Edge localized mode (ELM) mitigation accompanied by density pump-out has been achieved during the application of resonant magnetic perturbation (RMP) with a toroidal number n = 4 on EAST recently. The mean ELM frequency increases factor 2.7 from 86 to 235 Hz decreased reduction in loss. evolution pedestal electron measured profile reflectometer before and after turning RMP current is presented. Both gradient show decrease RMP. fluctuation region an O-mode reflectometer. broadband range...
Poloidally localized density fluctuation with applied and spontaneous 3-D fields in high-confinement mode (H-mode) plasma is observed by using poloidally distributed multichannel interferometer diagnostics the experimental advanced superconducting tokamak. With application of an n = 1 rotating nonaxisymmetric magnetic perturbation (NAMP) field, a appears on different channels sequentially. Evidence shows that this located at edge. When static NAMP field applied, amplitude increases parts but...
Abstract The extraordinary mode (X-mode) lower cut-off frequency is proposed for use in the reflectometry diagnostic on ITER electron density profile measurement, which a trade-off between extreme plasma parameters and accessible probing frequency. In contemporary experiments, can be identified at below cyclotron ( f ce ) under certain conditions. We provide here, first time, experimental validation of profiles via measurement EAST. corresponding group delay evolves continuously with upper...