A5016424822- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Laser-Plasma Interactions and Diagnostics
- Fusion materials and technologies
- Superconducting Materials and Applications
- Solar and Space Plasma Dynamics
- Particle accelerators and beam dynamics
- Plasma Diagnostics and Applications
- Atomic and Molecular Physics
- Neuroscience and Neural Engineering
- Advanced Image Processing Techniques
- High-pressure geophysics and materials
- Intermetallics and Advanced Alloy Properties
- Advanced Neural Network Applications
- Atomic and Subatomic Physics Research
- Magnetic Field Sensors Techniques
- Rare-earth and actinide compounds
- Advanced Materials Characterization Techniques
- Ferroelectric and Negative Capacitance Devices
- Laser-induced spectroscopy and plasma
- Dust and Plasma Wave Phenomena
- Advanced Memory and Neural Computing
Chinese Academy of Sciences
2015-2025
Hefei Institutes of Physical Science
2021-2025
Institute of Plasma Physics
2015-2025
Centre of Plasma Physics - Institute for Plasma Research
2025
Czech Academy of Sciences, Institute of Plasma Physics
2025
Southwestern Institute of Physics
2013-2018
National Institute for Fusion Science
2013
Recent Experimental Advanced Superconducting Tokamak (EAST) experiments have successfully demonstrated a long-pulse steady-state scenario with improved plasma performance through integrated operation since the last IAEA FEC in 2016. A discharge duration over 100 s using pure radio frequency (RF) power heating and current drive has been obtained required characteristics for future tokamak reactors such as good energy confinement quality (H98y2 ~ 1.1) electron internal transport barrier inside...
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...
Abstract We report observations of strong electron temperature profile stiffness in high poloidal beta (β_p~2) plasmas on EAST for the first time. Key features this regime include: (1) Negligible contributions to stored energy and from additional auxilliary heating power; (2) a rapid increase core broad-band turbulence (k_θ ρ_s~1-5,f~0-2000kHz) monitored by Collective Thomson Scatteing (CTS) diagnostic system. Notably, no significant impurities or MHD activities are observed during process....
Understanding the self-organized behaviour of particle confinement is critical for density control in magnetically confined thermonuclear fusion devices. This paper investigates spontaneous evolution peaking factor TEM turbulence-dominated ([Formula: see text]) H-mode plasma discharge, and relationship between broadband turbulence text] kHz) experimentally reported first time. In core region with higher pressure gradient lower collisionality text]), suppressed by [Formula: flow, which causes...
A pioneering 4-channel, high-k poloidal, millimeter-wave collective scattering system has been successfully developed for the Experimental Advanced Superconducting Tokamak (EAST). Engineered to explore electron density fluctuations, this innovative deploys a 270 GHz mm-wave probe beam launched from Port K and directed toward P (both ports lie on midplane are 110° part), where large aperture optics capture radiation across four simultaneous angles. Tailored measure fluctuations with poloidal...
A quasi-coherent mode (QCM) was measured by the tangential CO2 laser collective scattering diagnostic at high plasma electron density during both enhanced Dα/small edge-localized (ELM) and ELM-free H phases in Experimental Advanced Superconducting Tokamak (EAST). results from only local oscillator prove that QCM is far-forward mode. The driven fluctuation (k⊥<3 cm−1) magnetic suggest an electromagnetic typical frequency of f ≈ 26.5 kHz. combination analysis signals Mirnov suggests has...
Abstract Plasma boundary detection and reconstruction are important not only for plasma operation but also facing materials. Traditional methods, example, EFIT code, which is constrained by electromagnetic measurement, very challenging detecting the in long-pulse burning devices such as ITER. A novel algorithm of using one visible camera has been developed on experimental advanced superconducting tokamak (EAST) fusion reactors. U-Net convolutional neural network was used to identify pixel...
In this paper, we present clear experimental evidence of core region nonlinear coupling between (intermediate, small)-scale microturbulence and an magnetohydrodynamics (MHD) mode during the current ramp-down phase in a set L-mode plasma discharges advanced superconducting tokamak (EAST, Wan et al (2006 Plasma Sci. Technol. 8 253)). Density fluctuations broadband () MHD (toroidal number , poloidal ) are measured simultaneously, using four-channel tangential laser collective scattering...
Abstract One of the key challenges for future fusion research is to mitigate high steady-state heat load on divertor target plates, and detachment offers a promising solution. The Experimental Advanced Superconducting Tokamak (EAST) has developed several feedback control methods detachment. However, when an off-normal event momentarily disturbs main plasma, impurity seeding may still be conducted by these detachment, which probably drives plasma further away from its stable equilibrium or...
The tungsten spectrum in the extreme ultraviolet (EUV) wavelength range has been investigated tokamak HL-2A to find line emissions from low-ionized ions which can be used for transport study plasma edge. For this purpose, is injected using laser blow-off (LBO) technique with a newly developed double-layer target. total number of particles accurately controlled by adjusting distance focal lens A quasi-continuum called an unresolved transition array (UTA), consisting many several ionization...
Correlations between the edge fluctuations and pedestal evolution during relatively large localized mode (ELM) cycles at high normalized electron collisionality (νe,ped* > 1) on EAST tokamak are investigated. Not only electrostatic coherent (ECM, ∼50 kHz) low frequency magnetic (MCM, ∼32 but also a electromagnetic (HFM, >150 observed to be coexisting ELMs. After ELM crash, temperature recovered faster than density. It is found that saturation of ECM coincides more with density,...
High-k turbulence (1 < kθρs 5) spectrograms have been directly measured in density modulation experiments of the EAST tokamak using collective Thomson scattering diagnostic system. Density-peaking is achieved Lower Hybrid Wave (LHW) experiments, revealing that broadband sensitive to power LHW and concomitant variation density-peaking. Additionally, contributions 2.45/4.6 GHz peaking differ when Neutral Beam Injection (NBI) on/off, displaying distinct responses low/high frequency...
In this paper, we present a study on D?H (7Li) plasmas with moderate hydrogen concentration (?15%) the HT-7 tokamak. Enhanced density fluctuation induced by ion cyclotron range of frequencies (ICRF) at centre plasma is observed continuous wave CO2 (??=?10.6??m) collective scattering system. At same time, Doppler shift VD due to rotation in mode-converted ICRF experimentally for first time tokamak, and approximately linear versus change stored energy ?W.
Abstract The precise plasma boundary gap identification at the midplane is a prerequisite for achieving controlled positioning and holds significant importance stable operation of tokamak devices. This study proposes recognition algorithm based on visual endoscopy diagnostic. model an end-to-end one that uses convolutional neural network does not require manual data labeling. performance improved by experimentally comparing different layers input image sizes. validated using testing dataset...
The core microturbulence (, ) provided by a tangential CO2 laser collective scattering system on the EAST tokamak, in low (L) and high (H) confinement mode regimes respectively, are presented. We report change of characteristics from L-mode to H-mode: firstly, spectrograms show redistribution frequency domain after L–H transition; secondly, time evolution integrated spectral power displays that amplitude H-mode is much larger than L-mode; thirdly, cross-correlation time-frequency spectrum...
Abstract A broadband (BB) mode is observed by collective Thomson scattering diagnostics in repeatable shots of EAST and analyzed for the first time. This BB usually grows during L–H transitions, featuring a quasi-coherent with increasing frequency. During H-mode operations, it characterized steady-state high-frequency range ( f ∼ 200–2000 kHz), at electron scale k θ ρ s = 1‒2), mainly driven density gradient, sensitive to value η e region interest 0.4‒0.8), where <?CDATA ${\eta...
Since Alfvén activity and turbulence are ubiquitous in magnetically confined plasma, it is important to understand the possible roles have nonlinear evolution of turbulence. The designed experiments low collisionality dedicated studying dynamics between toroidal eigenmodes (TAEs), assessing multi-scale physics on long-term scale behavior fusion plasma. In TAEs (f ∼ 200 kHz, n = 1) mitigation under resonant magnetic perturbations (RMP, nupper 2 nlower 3), there a (∼500 ms) quasi-stationary...
Abstract A new multi-band and high-speed endoscope diagnostic for the observation of visible light has been successfully developed on Experimental Advanced Superconducting Tokamak. The mirror with an aperture is designed at head optical system. Based two dichroic mirrors, system divided into three imaging groups different bands, i.e. B (380–500 nm), G (500–580 nm) R (580–750 its focal length 16 mm a relatively large D / f = 1:4. spatial resolution less than 5 near object distance <?CDATA...
In this paper, we present experimental studies of both high-kr (k⊥ = 10,18,26 cm-1, and k⊥ρs 2,3.6,5.2, respectively; kr ≈ 0.87 k⊥) high-kθ 8,20 ≤ 0.73,1.86, kθ turbulence behavior during a ohmic energy confinement degradation phase in Experimental Advanced Superconducting Tokamak (EAST). High-kr from density fluctuation at r/a 0.5 high- 0.7-0.97 were measured by tangential poloidal CO2 laser collective scattering diagnostics, respectively. Note that kr, kθ, k⊥ ρs are radial wavenumber,...
The formation of radial electric field Er in the tokamak edge region is calculated based on collisionless ion orbit loss. loss generates a negative Er, which turn affects As result, can saturate at either low or high value, depending plasma parameters. When temperature higher than threshold, self-sustaining growth both and found, leading to saturation value milliseconds. This mechanism provides possible explanation for strong during transition from (L) (H) confinement regime observed plasmas.