A5088471190- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Fusion materials and technologies
- Ionosphere and magnetosphere dynamics
- Laser-Plasma Interactions and Diagnostics
- Superconducting Materials and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Atomic and Molecular Physics
- Nuclear Physics and Applications
- Laser-induced spectroscopy and plasma
- Nuclear reactor physics and engineering
- Atomic and Subatomic Physics Research
- Solar and Space Plasma Dynamics
- Physics of Superconductivity and Magnetism
- Plasma Diagnostics and Applications
- Hematopoietic Stem Cell Transplantation
- Fault Detection and Control Systems
- Spectroscopy and Chemometric Analyses
- Robotics and Sensor-Based Localization
- Laser Design and Applications
- Respiratory viral infections research
- Control Systems and Identification
- Hemoglobinopathies and Related Disorders
- Topic Modeling
- Mass Spectrometry Techniques and Applications
Institute of Plasma Physics
2016-2025
Chinese Academy of Sciences
2016-2025
Zhejiang Lab
2025
Hefei Institutes of Physical Science
2016-2024
University of Science and Technology of China
2016-2024
Institute of Intelligent Machines
2024
Shanxi Jincheng Anthracite Mining Group (China)
2024
Yankuang Energy Group Company Limited (China)
2024
Shenyang Ligong University
2024
Beijing Wuzi University
2023
Evidence of a nonlinear transition from mitigation to suppression the edge localized mode (ELM) by using resonant magnetic perturbations (RMPs) in EAST tokamak is presented. This first demonstration ELM with RMPs slowly rotating plasmas dominant radio-frequency wave heating. Changes topology after are indicated gradual phase shift plasma response field linear magneto hydro dynamics modeling result vacuum one and sudden increase three-dimensional particle flux divertor. The threshold depends...
Mastering nuclear fusion, which is an abundant, safe, and environmentally competitive energy, a great challenge for humanity. Tokamak represents one of the most promising paths toward controlled fusion. Obtaining high-performance, steady-state, long-pulse plasma regime remains critical issue. Recently, big breakthrough in steady-state operation was made on Experimental Advanced Superconducting (EAST). A with world-record pulse length 1056 s obtained, where density divertor peak heat flux...
The EAST research program aims to demonstrate steady-state long-pulse advanced high-performance H-mode operations with ITER-like poloidal configuration and RF-dominated heating schemes. Since the 2014 IAEA FEC, has been upgraded all ITER-relevant auxiliary current drive systems, enabling investigation of plasma profile control by coupling/integration various combinations. Fully non-inductive (H 98,y2 > 1.1) was extended over 60 s for first time sole RF plus good power coupling impurity...
Since the last IAEA-FEC in 2016, EAST physics experiments have been developed further support of high-performance steady-state operation for ITER and CFETR.First demonstration >100 seconds time scale long-pulse scenario with a good plasma performance (H98(y2) ~ 1.1) control impurity heat exhaust upper tungsten divertor has achieved on using pure radio frequency (RF) power heating current drive.The operational domain significantly extended towards more CFETR related high beta regime (βP ~2.5...
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...
Charge eXchange Recombination Spectroscopy (CXRS) and Beam Emission (BES) diagnostics based on a heating neutral beam have recently been installed EAST to provide local measurements of ion temperature, velocity, density. The system design features common light collection optics for CXRS BES, background channels the toroidal views, multi-chord viewing sightlines, high throughput lens-based spectrometers with good signal noise ratio time resolution measurements. Additionally, two each has...
A set of in-vessel resonant magnetic perturbation (RMP) coil has been recently installed in EAST. It can generate a range spectrum, and there is relatively large window for edge localized mode (ELM) control according to the vacuum field modeling island overlapping area. Observation mitigation suppression ELM slow rotating plasmas during application an n = 1 RMP presented this paper. Strong effect observed neutral beam injection heating plasmas. The frequency increases by factor 5, crash...
A 4.6 GHz lower-hybrid current drive (LHCD) system has been firstly commissioned in EAST the 2014 campaign. The first LHCD results with show that LHW can be coupled to plasma a low reflection coefficient, and rotation, modify profile, heat effectively. By means of configuration optimization local gas puffing near antenna, good LHW–plasma coupling coefficient less than 5% is obtained. maximum power up 3.5 MW. (CD) efficiency 1.1 × 1019 m−2 W−1 central electron temperature above 4 keV,...
Recent experiments on EAST have achieved the first long pulse H-mode (61 s) with zero loop voltage and an ITER-like tungsten divertor, demonstrated access to broad plasma current profiles by increasing density in fully-noninductive lower hybrid current-driven discharges. These discharges reach wall thermal particle balance, exhibit stationary good confinement (H98y2 ~ 1.1) low core electron transport, are only possible optimal active cooling of armors. In separate experiments, was...
Abstract Since the last IAEA-Fusion Energy Conference, Experimental Advanced Superconducting Tokamak (EAST) research program has been, in support of ITER and CFETR, focused on development terms long-pulse steady-state (fully noninductive) high beta H-mode scenario with active controls stationary transient divertor heat particle fluxes. The operational domain plasma been significantly extended ITER-like tungsten mono-block divertor, control heating schemes. EAST achieved several important...
Upgrade of the imaging X-ray crystal spectrometers continues in order to fulfill high-performance diagnostics requirements on EAST. For tangential spectrometer, a new large pixelated two-dimensional detector was deployed tokamaks for time-resolved imaging. This vacuum-compatible has an area 83.8 × 325.3 mm(2), framing rate over 150 Hz, and water-cooling capability long-pulse discharges. To effectively extend temperature limit, double-crystal assembly designed replace previous single crystals...
The internal transport barrier (ITB) has been obtained in ELMy H-mode plasmas by neutron beam injection and lower hybrid wave heating on the Experimental Advanced Superconducting Tokamak (EAST). ITB structure observed profiles of ion temperature, electron density within ρ < 0.5. It was also that formation is stepwise. Due to formation, confinement quality H98y2 increases from 1 1.1 normalized beta, βN, 1.5 near 2. fishbone activity during phase suggests central safety factor q(0) ∼ 1....
Abstract A recent EAST experiment has successfully demonstrated long pulse steady-state high plasma performance scenario and core-edge integration since the last IAEA in 2018. discharge with a duration over 60 s β P ∼ 2.0, N 1.6, H 98y2 1.3 an internal transport barrier on electron temperature channel is obtained multi-RF power heating current drive. higher ( 1.8, p 1.3, n e / GW 0.75) of 20 achieved by using modulated neutral beam power, where several normalized parameters are close or even...
The use of Highly Oriented Pyrolytic Graphite (HOPG) reflectors is often proposed in the design X-ray Crystal Spectroscopy (XCS) diagnostic systems for next-generation tokamak devices, including ITER project. This study introduces an experimental based on X-Ray Diffractometry (XRD) method to evaluate performance HOPG reflectors. provides both angular responses and reflectivities A demonstrative XRD experiment conducted, details are introduced. enables precise studies reflectors, facilitating...
The droplet size distribution typically decays exponentially in solutions formed by liquid-liquid phase separation. Nevertheless, a power-law of nucleoli volumes has been observed amphibian oocytes, which appears similar to the cluster reaction-limited aggregation. In this work, we study mechanism distributed sizes and unveil self-organized criticality driven influx random fusion between droplets. Surprisingly, dynamics is governed Smoluchowski equation as aggregation systems. system reaches...
Large language models (LLMs) have demonstrated remarkable capabilities in code-related tasks, such as code understanding and generation. However, an equally important yet underexplored question is whether LLMs can serve general-purpose surrogate executors, to predict the output behavior of a program without actually running it. To systematically investigate this capability, we introduce SURGE, comprehensive benchmark covering eight key aspects: multi-language programming competition-level...
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....
Abstract The formation of a static 3-Dimensional (3D) helically localized perturbation structure the Toroidal Alfv'en Eigenmode (TAE) is observed for first time under magnetic islands induced by Resonant Magnetic Perturbations (RMP) in tokamak plasmas. Before application RMP, TAE around 200 kHz excited Electron Cyclotron Resonance Heating (ECRH) Energetic Electrons (EEs). After n = 1 mode into helical area on flux surface, where toroidal number. We find strengthened near X points m/n=-3/1...
Abstract Charge eXchange Recombination Spectroscopy (CXRS) diagnostics are widely deployed in fusion experimental devices for the local measurement of key parameters: ion temperature, rotation velocity and density low-Z impurities. Russian Federation Domestic Agency (RF-DA) developed High-Etendue Spectrometer (HES) designed to fulfill requirements International Thermonuclear Experimental Reactor (ITER) CXRS-edge diagnostics. The HES employs three holographic diffraction gratings that operate...
The Motional Stark Effect (MSE) diagnostic is one of the key methods for measuring current density distribution in magnetically confined fusion plasmas. On Experimental Advanced Superconducting Tokamak, a calibration system based on collaborative robot has been developed to enhance accuracy work during maintenance period. This robotic uses camera automatically capture observation sightlines and generates polarized light with an ∼0.5 mdeg. Additionally, it records MSE response at each angle...
This paper targets on the regularization effect of momentum-based methods in regression settings and analyzes popular diagonal linear networks to precisely characterize implicit bias continuous versions heavy-ball (HB) Nesterov's method accelerated gradients (NAG). We show that, HB NAG exhibit different compared GD for networks, which is from one classic problem where share same with GD. Specifically, role momentum twofold: (a) induce extra initialization mitigation effects similar SGD that...
In recent years, EAST has achieved a 60-s scale steady-state plasma operation (SSO), which is electron dominant heated by the cyclotron wave and low hybrid wave. Substantial progresses have been made in development of long-pulse operation, such as active control radiative divertor, edge localized mode (ELM) suppression, He experiment. To further develop scenario study related critical physical issues, upgrade completed 2020. The auxiliary heating systems were rearranged upgraded with total...
Controlling the steady state particle and heat flux impinging on plasma facing components, as one of main concerns future fusion reactors, is still necessary when transient power loads induced by edge localized modes (ELMs) have been eliminated resonant magnetic perturbations (RMPs) in high confinement tokamak experiments. This especially true for long pulse operation. One promising solution to use rotating perturbed field. Recently differential phase scans n = 1 2 RMP fields operated first...