A5037708125- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Ionosphere and magnetosphere dynamics
- Laser-Plasma Interactions and Diagnostics
- Fusion materials and technologies
- Plasma Diagnostics and Applications
- Superconducting Materials and Applications
- Nuclear reactor physics and engineering
- International Development and Aid
- Gyrotron and Vacuum Electronics Research
- Big Data Technologies and Applications
University of South China
2015-2024
Southwestern Institute of Physics
2023
Huangshi Central Hospital
2023
Abstract According to the physics of tokamak start-up, this study constructs a zero-dimensional (0D) model applicable electron cyclotron (EC) wave assisted start-up in NCST spherical torus (spherical tokamak) and CN-H1 stellarators. Using constructed 0D model, results obtained under same conditions are compared validated against reference for pure hydrogen plasma tokamak. The good agreement, especially regarding temperature, ion temperature current. In presence finite Ohmic electric field...
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...
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...
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,...
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 Large-amplitude edge-localized modes (ELMs) are a major concern in the development of tokamak fusion energy. According to peeling–ballooning theoretical model, effective current drive pedestal region high-confinement (H-mode) plasmas can alter profile this and hence affect ELM instabilities. Using ray-tracing Fokker–Planck quasilinear codes, localized by electron cyclotron (EC) waves H-mode is studied paper. Numerical investigations performed under present-day medium-sized tokamaks...
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 With the increasing demand for electricity and wide use of renewable energy, power system is facing higher complexity challenges. In order to meet these challenges, cloud-side collaborative architecture has become an innovative solution with great potential. Firstly, this paper discusses basic concept architecture, which integrates cloud computing, edge computing terminal devices achieve more efficient data processing analysis. This provides real-time collection monitoring...
Ion cyclotron resonance heating is a reliable tool for high-power and long-pulse operation in fusion reactors. However, sudden increase the reflected radio-frequency (RF) power poses serious problems such as L- to H-mode transition or edge-localized modes that must be solved future It necessary place an impedance matching system between RF generator antenna mitigate adverse effects of variations. The idea fast-response ferrite stub tuner was developed trace load variation antenna. This study...
A theoretical study on a ferrite stub tuner antenna system for ion cyclotron resonance frequency (ICRF) heating is discussed in this paper. High amounts of radio power can be reflected at the as result impedance mismatches arising from large changes plasma resistance during L- to H-mode transitions or edge localized modes. fast-response network has been proposed mitigate these reflections by rapidly varying match rapid load ICRF antenna. This numerically shows influence relationship...