A5027842915- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Superconducting Materials and Applications
- Ionosphere and magnetosphere dynamics
- Plasma Diagnostics and Applications
- Fusion materials and technologies
- Nuclear Physics and Applications
- Laser-Plasma Interactions and Diagnostics
- Solar and Space Plasma Dynamics
- Gyrotron and Vacuum Electronics Research
- Electromagnetic Simulation and Numerical Methods
- High-Voltage Power Transmission Systems
- Advanced Power Amplifier Design
- Electromagnetic Scattering and Analysis
- Radiation Detection and Scintillator Technologies
- Lightning and Electromagnetic Phenomena
- Silicon Carbide Semiconductor Technologies
- Optimal Power Flow Distribution
- Atomic and Subatomic Physics Research
- Laser-induced spectroscopy and plasma
- Nuclear reactor physics and engineering
- earthquake and tectonic studies
- Power Systems and Renewable Energy
- Antenna Design and Optimization
- GaN-based semiconductor devices and materials
Institute of Plasma Physics
2015-2024
Chinese Academy of Sciences
2015-2024
Hefei Institutes of Physical Science
2023-2024
Shanghai Electric (China)
2021
Southeast University
2015
CEA Cadarache
2007
Centre National de la Recherche Scientifique
2007
Université de Lorraine
2007
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...
Deuterium high-confinement (H-mode) plasmas, lasting up to 3.45 s, have been generated in the EAST by ion cyclotron range of frequency (ICRF) heating. H-mode access was achieved coating molybdenum-tiled first wall with lithium reduce hydrogen recycling from wall. plasmas plasma currents between 0.4 and 0.6 MA axial toroidal magnetic fields 1.85 1.95 T were 27 MHz ICRF heating deuterium minority. The input power required 1.6–1.8 MW. line-averaged density (1.83–2.3) × 1019 m−3. 200–500 Hz...
Abstract Ion cyclotron resonance heating (ICRH) plays a crucial role in magnetic confinement nuclear fusion, enhancing plasma temperature and enabling sustained fusion reactions. Full wave simulations the ion range of frequency (ICRF) are essential for exploring mechanisms guiding experiments. This paper focuses on development application finite element method (FEM) based full simulation code, INTFLUK, which incorporates poloidal field to account up down shift effect parallel number. The...
Abstract As part of ITPA-Integrated Operational Scenario activities, this contribution reviews recent experimental characterizations radio-frequency (RF)-induced scrape-off layer (SOL) modifications various tokamaks worldwide and the LArge Plasma Device at UCLA. The phenomenology, as observed using a large variety measurement techniques, is consistent with expectations from RF sheath rectification. Emphasis then put on complex three-dimensional (3D) spatial patterns RF–SOL interaction, in...
Radio frequency (RF) heating in the ion cyclotron range of frequencies (ICRF) is one primary auxiliary methods for EAST. The ICRF system provides 6 MW power phase and will be capable 10 later. Three 1.5 systems a 25 MHz to 70 have already been operation. launchers are designed two current straps with each driven by RF source MW. In this paper brief introduction capability EAST preliminary results presented.
The experiments were carried out to study the coupling characteristics of I-port antenna in ion cyclotron range frequencies (ICRF) EAST. dependencies resistance on various parameters including position, central electron density, gas injection and phasing have been studied. results obtained show that experimental data are consistent with theoretical simulations. We find loading decreases sharply at L-H transition due change plasma density profiles scrape-off layer (SOL). effect low hybrid...
Abstract Several experiments on different machines and in fast wave (FW) heating regimes, such as hydrogen minority high harmonic waves (HHFW), have found strong interaction between radio-frequency (RF) the scrape-off layer (SOL) region. This paper examines propagation power loss SOL by using full code AORSA, which edge plasma beyond last closed flux surface (LCFS) is included solution domain a collisional damping parameter used proxy to represent real, most likely nonlinear, processes. 2D...
A new ICRF antenna has been designed in EAST, whose aims are to reduce the parallel RF electric fields E|| and investigate current drive using fast magnetosonic wave. This consists of four toroidally spaced radiating straps. The electrical characteristics estimated by a three-dimensional electromagnetic commercial code. S-parameters, distribution field on near 4-strap analyzed, potentials influenced phasing radial position investigated.
A passive and noninvasive diagnostic system based on high-frequency B-dot probes (HFBs) has been designed developed for the measurement identification of ion cyclotron emission (ICE) in Experimental Advanced Superconducting Tokamak (EAST). Details hardware components this including HFBs, direct current blockers, radio frequency splitters, filters, power detectors as well data acquisition systems are presented. spectrum analyzer is used addition to ordinary speed card registration analysis....
Waves in the ion-cyclotron range of frequencies (ICRF) used for tokamak heating are known to interact strongly with scrape-off layer (SOL) plasma, potentially limiting ICRF performance. We present effect on triple-probe signals Experimental Advanced Superconducting Tokamak (EAST) experiment, an advanced superconducting two antennas and 12 MW source power support high-power long-pulse operation. Applying time-resolved magnetic mapping divertor probe arrays enables detailed sensing spatial...
Ion cyclotron emissions (ICE) driven by high energy ions in the Experimental Advanced Superconducting Tokamak (EAST) are reported. The classic edge energetic neutral beam injection (NBI) deuterium at low magnetic field side, near plasma pedestal region, often observed. In addition, ICE, spectral peaks of which match frequencies fusion and NBI axis also detected. ICE experiments, is heated with NBI, without any ion resonance heating. H-mode discharges, localized mode can not only increase...
Recent ion cyclotron range of frequency (ICRF) experiments combined with lower hybrid wave (LHW) on EAST show that LHW coupling can be strongly modified when the launcher is connected magnetically to a powered ICRF antenna. Using Langmuir probes, investigation radio (RF)-enhanced potential and local plasma parameters under an applied pulse carried out EAST. When antenna probe powered, localized high positive peaks appear floating potential. The dependence modifications various investigated....
Abstract Quasi-periodic pedestal burst instabilities (PBIs), featuring alternative turbulence suppression and bursts, have been clearly identified by various edge diagnostics during I-mode to H-mode transition in the EAST Tokamak. The radial distribution of phase perturbation caused PBI shows that is localized pedestal. Prior each PBI, a significant increase density gradient close top can be distinguished, then generated, accompanied relaxation profile, induces an outward particle flux....
Ion cyclotron resonance heating (ICRH), one of the main auxiliary methods, for high-power and long-pulse plasma had been developed in Experimental Advanced Superconducting Tokamak (EAST). An impedance matching system, important part ICRH, injection transmitter protection by reducing reflected power from antenna. The input outlet stub tuner can be measured voltage-current probes installed on coaxial transmission line between antenna triple liquid tuners, optimum levels tuners calculated based...
The Ion Cyclotron Range of Frequency (ICRF) heating system the China Fusion Engineering Test Reactor (CFETR) is intended to provide plasma with a minimum power output 20 MW, which demands Radio (RF) window possess higher performance requirement. This paper presents design an RF for CFETR ICRF and focuses primarily on confirmation its electromagnetic performance. can be effectively matched in operating frequency range has S11 under −59 dB. geometry cone type ceramics was optimized reduce...
Abstract Two new ICRF antennas operating in the ion cyclotron radio frequency (ICRF) range have been developed for EAST to overcome low coupling problem of original antennas. The were limited their power capacity due insufficient coupling. antenna design takes into account both wave and absorption processes through comprehensive codes, with dominant parallel number 7.5 m −1 at dipole phasing. Through use these antennas, we are able achieve 3.8 MW output 360 s operation, respectively. initial...
In view of improving ion cyclotron range frequencies (ICRF) wave coupling in EAST (experimental advanced superconducting tokamak) necessary to obtain high-power discharges, two series experiments L-mode were devoted the use local gas injection as a tool increase density front antennas. During first session, quantity deuterium simultaneously puffed from five different poloidal positions on each side one ICRF antenna was gradually increased. Steady puffing this (~8.1020 e s−1) increased...
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Spectral intensities emitted from high-<inline-formula> <tex-math notation="LaTeX">$Z$ </tex-math></inline-formula> metal impurity ions of Fe<sup>22+</sup> at 132.91 Å, Mo<sup>30+</sup> 115.999 Mo<sup>31+</sup> 127.868 W<sup>42+</sup> 129.41 W<sup>43+</sup> 126.29 and W<sup>45+</sup> 126.998 Å their radial profiles have been observed in EAST plasmas using a space-resolved extreme ultraviolet (EUV) spectrometer. Local emissivity the...
High-Z impurities production is often observed during Ion Cyclotron Range of Frequencies (ICRF) waves' injection, which are likely due to RF sheath formation on solid materials. Based Extreme UV (EUV) spectrometry data, this study in EAST consists extracting information plasma-surface interactions ICRH. Intensities the different spectral lines normalized line-integrated plasma density, exhibit parametric dependencies over scans ICRH and LH power for toroidal phasing between straps. Materials...
Effective coupling for lower hybrid waves (LHWs) is achieved by adjusting the launcher position and optimizing plasma configuration in L-mode EAST. It found that, compared with other divertor shapes, double null shows better performance at same of (LH) grill, especially case a large safety factor near separatrix (q95) edge recycling (Dα) intensity. The ion cyclotron range frequency (ICRF) power has significant impact on LH wave when ICRF antenna magnetically connected to grill. asymmetry...