A5020839042- Superconducting Materials and Applications
- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- HVDC Systems and Fault Protection
- High-Voltage Power Transmission Systems
- Electromagnetic Launch and Propulsion Technology
- Antenna Design and Analysis
- Microwave Engineering and Waveguides
- Fusion materials and technologies
- Silicon Carbide Semiconductor Technologies
- Magnetic Field Sensors Techniques
- Advanced DC-DC Converters
- Smart Grid and Power Systems
- Power Systems and Technologies
- Advanced Antenna and Metasurface Technologies
- Multilevel Inverters and Converters
- Advanced Sensor and Control Systems
- Real-time simulation and control systems
- Antenna Design and Optimization
- Advanced Data Processing Techniques
- Electrical Contact Performance and Analysis
- Fault Detection and Control Systems
- Wireless Power Transfer Systems
- Sensor Technology and Measurement Systems
- Thermal Analysis in Power Transmission
Institute of Plasma Physics
2015-2024
Chinese Academy of Sciences
2015-2024
Zhengzhou University
2024
Hefei Institutes of Physical Science
2018-2024
Xinjiang Institute of Ecology and Geography
2024
Ministry of Natural Resources
2024
Dalian Maritime University
2024
Tsinghua University
2024
Xi'an Jiaotong University
2024
Yantai University
2024
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...
This paper introduces the preliminary design of poloidal field alternating-current/direct-current converter for coil power supply system applied in ITER project; it includes description inputs, topology optimization, analysis, electrical design, test procedure and criteria, related interface, control protection.
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...
Implicit neural networks have emerged as a crucial technology in 3D surface reconstruction. To reconstruct continuous surfaces from discrete point clouds, encoding the input points into regular grid features (plane or volume) has been commonly employed existing approaches. However, these methods typically use an index for uniformly scattering features. Compared with irregular features, may sacrifice some reconstruction details but improve efficiency. take full advantage of two types we...
In this paper, firstly, ITER power supply and its AC/DC converter in 2001 design have been introduced. Some import criteria such as FSC internal bypass are reviewed researched. The system overvoltage low frequency oscillation also studied. Then some proposals to improve the baseline presented, these validated supported by scientists experts from two Expert Groups organized IO.
Abstract This research focuses on solving the fault detection and health monitoring of high-power thyristor converter. In terms critical role converter in nuclear fusion system, a method based long short-term memory (LSTM) neural network model is proposed to monitor operational state accurately detect faults as they occur. By sampling processing large number operation data, LSTM trained identify abnormal state, power supply status monitored. Compared with traditional methods, shows higher...
Abstract This paper presents a grounding protection system of the central solenoid model coil (CSMC) Comprehensive Research Facility for Fusion Technology (CRAFT). The scheme neutral point voltage detections has been adopted in system. Compared with usual current acquisition, measurement data is accurate, there no redundant loop, and economic benefit high. In this paper, single-end double-ends fault superconducting magnet are analyzed, under different conditions calculated. simulation CSMC...
Abstract This study demonstrates AlGaN multifaceted multiple quantum wells (MQWs) with significantly enhanced localized emission, achieved through anisotropic growth control in migration-enhanced metal-organic chemical vapor deposition. By precisely regulating in-plane kinetics, pit-free semipolar sidewalls tailored microstructures MQWs were obtained, leading to optimized emission properties. Scanning Auger Nanoprobe analysis revealed Ga-rich apex regions within the microfacets, which...
The three-phase two-level pulsewidth modulation (PWM) converter operates in rectification state or active inverter according to the corresponding experimental requirements of Experimental Advanced Superconducting Tokamak. However, current fault diagnosis methods proposed for PWM converters usually deal with only state. To solve this problem, article proposes a method detect single and double open-circuit faults under both First, an inception-based neural network model is proposed, which 1 ×...
This paper gives a description of the poloidal field coil quench protection (QP) and control EAST power supplies. A configuration QP hardware an operating scenario are presented; design principle in tokamak is also introduced.
During excitation and demagnetization phase for the superconducting magnet, in dual-active-bridge (DAB) converter based power supply, a dc bias may occur high-frequency transformer thus lead to faults. In this paper, an improved transient extend-phase-shift (TEPS) control strategy is proposed suppress without any additional hardware. Unlike traditional (EPS) strategy, voltages of are asymmetrical half period after changing phase-shift then remain symmetrical. This makes it take switching...
EAST (Experimental Advanced Superconducting Tokamak) fast control power supply is a large capacity single phase inverter supply, which traces displacement signal of plasma, and excites four fast-control coils in vacuum chamber to produce magnetic field that realizes plasma stabilization elongate model. To meet the requirement current response, multi-inverters parallel presented. The technique carrier wave Phase-shift PWM applied decrease switching loss IGBT, raise equal switch-frequency...
Abstract Since the last IAEA-FEC in 2021, significant progress on development of long pulse steady state scenario and its related key physics technologies have been achieved, including reproducible 403 s long-pulse steady-state H-mode plasma with pure radio frequency (RF) power heating. A thousand-second time scale (∼1056 s) fully non-inductive high injected energy up to 1.73 GJ has also achieved. The EAST operational regime β P significantly extended ( H 98y2 > 1.3, ∼ 4.0, N 2.4 n e / GW...
Experimental Advanced Superconducting Tokamak (EAST), a National Mage project of Science Research China, is very important fusion experiment facility. The ability magnetic confinement to plasma can be improved by elongating cross section in EAST. However, elongated has vertical displacement instability; without control, will dash against wall vacuum vessel and disrupt, which cause failure discharge. Therefore, feedback control system needed restrain displacement. Fast power supply excites...
The experimental advanced superconducting tokamak (EAST) is a tokamak, which successfully achieved the first plasma discharge in 2006. major radius of EAST 1.9 m, and its central magnet field 3.5 T. In past few years, has made many achievements, such as 60-s double-null divertor configuration 1-MA plasma. 2012, 411-s long-pulse with 0.28-MA current 32-s H-mode operation was at seventh campaign. addition, various means for mitigating ELMs have also been demonstrated to facilitate operation....
A novel wideband cavity-backed slot antenna operating at X-band is proposed. Compared to conventional antennas, both the bandwidth and gain of proposed are significantly increased by adding a multilayer dielectric cover. This offers 40% (|S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> | <; -10 dB) impedance bandwidth. Meanwhile, single within this band 6-9.5 dBi, 2-3 dB higher than those without that cover most To further validate...
the paper gives a description and key design features for EAST power supply system consisting of superconducting coil supply, inner vessel additional heating including microwave supplies neutral beam injection supply. These are all realized by AC/DC converter, H Bridge IGBT chopper.
A novel current transducer based on rectangular array of magnetic sensors is proposed. It a valid alternative to traditional transformers in high power dc busbar systems for fusion applications. Since measured fields along closed integral path fluctuate violently, sum-average algorithm, which most commonly used by circular arrangement sensor array, does not fulfill the accuracy requirement any more. Numerical quadrature algorithms orders are applied improve array's accuracy. The algorithm...
The required peak current and voltage of ITER in-vessel vertical stability (VS) coil power supply are up to 80 kA 2.4 kV, so VS needs a pulse width modulation (PWM) rectifier achieve high factor operation under the highly transient demand value 144 MW. A new maximum control method for three-phase source PWM based on its mathematical model in d-q frame improved by dual-closed-loop has been presented. This meets fast charging dc-side stabilization supply, achieves unity or operation;...
The EAST superconducting tokamak is an advanced steady-state experimental device built at the Institute of Plasma Physics, Chinese Academy Sciences between 2000 and 2006. This paper describes poloidal field power supply. configuration design supply its operation scenario are presented. A unit test whole results also discussed in detail.