A5044266197- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Ionosphere and magnetosphere dynamics
- Fusion materials and technologies
- Laser-Plasma Interactions and Diagnostics
- Plasma Diagnostics and Applications
- Superconducting Materials and Applications
- Nuclear Physics and Applications
- Seismic Imaging and Inversion Techniques
- Statistical Distribution Estimation and Applications
- Nuclear reactor physics and engineering
- Solar and Space Plasma Dynamics
- Gyrotron and Vacuum Electronics Research
- X-ray Spectroscopy and Fluorescence Analysis
- Astronomical Observations and Instrumentation
- Dust and Plasma Wave Phenomena
- Scientific Measurement and Uncertainty Evaluation
- Supercapacitor Materials and Fabrication
- Tribology and Lubrication Engineering
- Ion-surface interactions and analysis
- Image Processing and 3D Reconstruction
- Advanced Battery Materials and Technologies
- Geological Modeling and Analysis
- Extraction and Separation Processes
- Mechanical Engineering and Vibrations Research
University of South China
2015-2024
South China Normal University
2024
China University of Geosciences
2023
Southwestern Institute of Physics
2023
Huangshi Central Hospital
2023
Northeastern University
2023
South China University of Technology
2022
Institute of Plasma Physics
2020
Chinese Academy of Sciences
2020
Abstract The three-dimensional (3D) magnetohydrodynamic (MHD) code JOREK was utilized to perform a linear study on the HL-2A device. primary objective of this investigation is gain insight into how Resonant Magnetic Perturbation (RMP) influences plasma equilibrium and, consequently, behavior Edge Localized Modes (ELMs). A scan n=1 (n toroidal mode number) RMP coil current from 1 4.9 kAt reveals transition n=4 n=3 for dominant number, after field exceeds certain threshold. By comparing...
The effect of toroidal plasma rotation on q = 3 double tearing modes (DTMs) was studied numerically in cylindrical geometry using the method reduced magnetohydrodynamic simulation. results indicate that can reduce growth rate DTMs, but magnitude velocity has weak effect, especially without shear. When shear exists, suppression becomes better. Whether flow or not, DTMs decreases as increases. With increase shear, grow slowly. And early and transition stage is better, which means suppress...
Abstract Based on OMFIT framework and HL-2M parameters, this paper comprehensively considers the changes in plasma density, temperature, other transport quantities caused by interaction of neutral beam injection (NBI) electron cyclotron wave (ECW) with plasma. The Shafranov shift magnetic surface center are also evaluated. Theoretically, influence NBI deposition location current drive efficiency ECW is studied. According to findings, affected position (ECCD) deposited both high field side...
Localized current drive by electron cyclotron (EC) waves is of significant importance in the outer half region tokamak plasmas. Using coupled GENRAY/CQL3D suite codes, a systematic comparative study between Ohkawa (OKCD) and (ECCD) performed. The results show that OKCD has more advantages than ECCD for far off-axis localized tokamaks with large inverse aspect ratios, while efficient low ratios. local driving on q = 2 rational surface both are effective control m 2/n 1 tearing mode or...
The collisionless trapped electron modes in the short wavelength region k⊥ρs>1 (SWTEMs) are studied with gyrokinetic integral eigenmode equation tokamak plasmas. Here, we present a systematic study of correlation between SWTEMs and ion temperature gradient (SWITG) modes. kθρs spectra TEM have double humps long regions, respectively. SWITG effects taking into account broader spectra. Dependences growth rate real frequency on various parameters, such as (ηi), electrons (ηe), toroidicity...
A localized and efficient current drive method in the outer-half region of tokamak with a large inverse aspect ratio is proposed via Ohkawa mechanism electron cyclotron (EC) waves. Further off-axis (OKCD) EC waves was investigated high beta βe HL-2M-like tokamaks ratio, EAST-like low ratio. OKCD can be driven efficiently, profile spatially radial region, ranging from 0.62 to 0.85, where fraction trapped electrons provides an excellent advantage for OKCD. Furthermore, efficiency increases...
Abstract For a fusion device, plasma pre-heating is required before the self-sustaining burning-state reactions of deuterium (D) and tritium (T) commence. Plasma heating with waves in ion-cyclotron range frequencies (ICRF) effective tokamaks. A new three-ion ICRF scheme for plasmas Chinese Fusion Engineering Test Reactor (CFETR) that require an increase bulk ion temperature via lithium impurities D–T plasmas, was studied numerically. Our simulations show radio-frequency wave power strongly...
The enhanced transport of passing energetic ions (PEIs) in presence the resonant interactions with a rotating magnetic island is investigated within drift kinetic framework. When rotation plays role interaction, we find that velocities PEIs satisfy constraint relation flux surface phase space. surfaces overlap real A new channel responsible for moving across surfaces, i.e., continuously overlapping, found. Two kinds radial motions can be induced by overlapping: one arises from coupling...
Abstract On the basis of OMFIT integrated simulation platform and parameters HL-2M device, a hybrid scenario with typical safety factor q profile is simulated using joint injection method neutral beam electron cyclotron wave normalized toroidal beta ( β N ) 2.39. At same time, by analyzing effect impurity concentration Z eff pedestal density n e,ped on confinement, higher obtained, reaching 3.118. The research results indicate that turbulent stabilization caused gradually decreases from...
Impurity seeding is the major technology for divertor power exhaust. In this work, impact of N and Ne impurity on behavior neutrals in region was systematically studied based HL-2A tokamak. The results demonstrated a strong correlation between target deuterium molecular density electron temperature after N/Ne seeding. addition, it found that atoms played more important role reducing injection at Te <15 eV than Moreover, radiation atom excitation channel stronger impurity. It also can...
The bootstrap current of fast ions produced by neutral beam injection (NBI) is investigated in a large-aspect-ratio tokamak with circular cross-section under specific parameters. density distribution and the total are reported. In addition, always accompanies electron return due to parallel momentum transfer from ions. With taken into consideration, net obviously decreases; at same time, peak moves towards central plasma. Numerical results show that value depends sensitively not only on...
Abstract Following an upgrade of the neutral beam injection (NBI) system, obvious synergy between combined NBI and ion cyclotron resonance frequency (ICRF) heating was observed in recent experiments conducted at EAST. To investigate effects beam-ions accelerated by radiofrequency (RF) wave, analyses are performed using TRANSP code based on experimental results. The calculated results argue that only a small fraction ICRF power is absorbed ions + synergistic (H)D plasma. enhance beam–RF...
A new synergy mechanism between the Ohkawa current drive (OKCD) of electron cyclotron (EC) waves and lower hybrid (LHCD) is discovered discussed. The methodology to achieve this effect also introduced. Improvement OKCD efficiency can be achieved by up a factor ~2.5 in far off-axis radial region (ρ > 0.6) tokamak plasma. By making EC wave heating electrons have parallel velocity co-Ip direction counter-Ip direction, comes from results trapping detrapping processes. makes low-speed,...
Heating with the wave in ion cyclotron range of frequencies (ICRF) has been used development high-performance H-mode operations EAST. A different resonance heating scenario three-ion component plasma real experimental parameters on EAST was investigated using a numerical tool. Excellent radio frequency absorption found an extremely low 3He concentration (0.1%–0.4%) D-H-(3He) plasma, by adjusting composition appropriately our simulation. In this case, fundamental layer is located between two...
Abstract The combined drive current of the lower hybrid wave (LHW) and high harmonic fast (HHFW) was studied theoretically for first time, based on use low higher β e operational parameters in EAST. Broad significant synergistic effects are found simulation, (CD) efficiency is greatly improved, profile modified as a result synergy between two types waves. LHW interacted with resonant electrons parallel velocity region pushes them into adjacent resonance phase (HHFW), thus number HHFW...
Abstract Divertor detachment has significant potential for reducing the divertor target thermal load, and impurity seeding is primary method achieving detachment. In this study, different scenarios (N, Ne, Ar) at boundary region of HL-2A were simulated using SOLPS-ITER code. Density scans revealed that when electron temperature dropped below 5 eV, a rollover in radiation from core edge regions Ar, N, Ne occurred, impurities started to increase concurrently, indicating correlation between...
Abstract The loss of ion cyclotron resonance frequencies (ICRF)-heated neutral beam injection ions in experimental advanced superconducting tokamak was numerically investigated by ORBIT code simulations. effects collisions and ripples on particle losses were taken into account, the distributions fast generated different beams combination with ICRF heating calculated using TRANSP code. Results showed that waves altered orbital ions, causing an increase trapped losses. Additionally, for...
Abstract Focusing on the impact of hot plasma effects electron cyclotron current drive (ECCD), this paper presents numerical results top launch ECCD (TL-ECCD) and outside midplane or equatorial-plane (EL-ECCD) in HL-3-like tokamak plasmas. For EL-ECCD, there is little difference calculated under cold propagation models, are not affected by dominant mechanism EC waves. In cases TL-ECCD, large initial parallel refraction makes influence become significant. range toroidal magnetic fields B T...
Abstract Divertor asymmetry is a major challenge in achieving high-power, long-pulse discharges future fusion reactors. Impurity seeding the most common method for divertor detachment devices. In this study, SOLPS-ITER code used to investigate impact mechanisms of nitrogen (N) and neon (Ne) impurity on between inner outer HL-2A under attached detached conditions. Results indicate that N Ne can increase energy particle flux targets. The trend ratio targets consistent with ratio. Research...
Abstract The coupling asymmetry characteristics of an ion cyclotron resonance heating (ICRH) antenna consisting two poloidal aligned straps are studied for a JET‐type tokamak. model used combines three‐dimensional (3‐D) planar, cold‐plasma, single pass antenna‐plasma code with any phase difference between the current straps, which takes into account feeders' and effects. result shows that radiated energy in direction can be controlled through changing when equals to π , tends become most...