A5103008853- Particle accelerators and beam dynamics
- Plasma Diagnostics and Applications
- Magnetic confinement fusion research
- Metal and Thin Film Mechanics
- Fusion materials and technologies
- Atomic and Molecular Physics
- Advanced materials and composites
- Nuclear Physics and Applications
- Ion-surface interactions and analysis
- Nuclear Materials and Properties
- Mass Spectrometry Techniques and Applications
- Welding Techniques and Residual Stresses
- Particle Accelerators and Free-Electron Lasers
- Intermetallics and Advanced Alloy Properties
- Electrostatic Discharge in Electronics
- Catalytic Processes in Materials Science
- Rare-earth and actinide compounds
- Superconducting Materials and Applications
- Membrane-based Ion Separation Techniques
- Ammonia Synthesis and Nitrogen Reduction
- High voltage insulation and dielectric phenomena
- Inorganic Fluorides and Related Compounds
- Nanomaterials for catalytic reactions
- Ionic liquids properties and applications
- Patient Safety and Medication Errors
Southwestern Institute of Physics
2012-2024
Second Affiliated Hospital of Nantong University
2024
Southwest Jiaotong University
2024
The Graduate University for Advanced Studies, SOKENDAI
2015-2017
National Institute for Fusion Science
2015
City University of Hong Kong
2013
Abstract This study used molecular dynamics software LAMMPS to simulate the surface binding energy of W1-xMox (x=0,0.9375,0.875,0.75,0.625,0.5) alloy (110) surface. The effect thermal vibration, model size, step size and temperature for comprehensively considered. Finally, reference values W-Mo alloys with different concentrations were obtained, it was found that, within simulation range, as Mo concentration increased, W atoms increased from 11.661±0.017 eV 12.058±0.047 eV, while decreased...
Recent research results on negative-ion-rich plasmas in a large negative ion source have been reviewed. Spatial density and flow distributions of hydrogen ions (H−) positive together with those electrons are investigated 4-pin probe photodetachment (PD) signal Langmuir probe. The PD is converted to local H− from calibration scanning cavity ring down measurement. Introduction Cs changes the slope plasma potential distribution depending upon grid bias. A higher electron H2 locally shields bias...
Abstract Since the first plasma realized in 2020, a series of key systems on HL-3 (known as HL-2M before) tokamak have been equipped/upgraded, including in-vessel components (the wall, lower divertor, and toroidal cryogenic/water-cooling/baking/glow discharge systems, etc.), auxiliary heating system 11 MW, 28 diagnostic (to measure density, electron temperature, radiation, magnetic field, etc.). Magnet field were commissioned firstly for divertor discharges. During 2nd experimental campaign...
The Cavity Ringdown Technique (CRD) is applied for negative hydrogen ion (H−) density measurement in H− source the neutral beam injector. CRD one of laser absorption techniques. Nd:YAG pulse was utilized negative-hydrogen-ion photodetachment. related to extracted successfully observed by a fixed position CRD. A two-dimensional movable has been developed measure profile. Measured profiles were consistent with expected from production area pure and cesium seeded plasmas. By applying saturation...
Based on the DFT method, effects of copper and tungsten impurities present in negative ion source neutral beams cesiated surface were studied, including their adsorption energy cesium work function. The results indicate that significantly increase average cesium, whereas has limited enhancement may even reduce it. function calculations show that, at coverages below 4/16 θ, cause a significant However, above 6/16 high-coverage lead to further decrease function, causing coverage corresponding...
Experiments by a four-pin probe and photodetachment technique were carried out to investigate the charged particle flows in beam extraction region of negative hydrogen ion source for neutral injector. Electron positive obtained from polar distribution saturation current. Negative flow velocity temperature comparing recovery times signals at opposite tips. ions are dominated crossed field drift ambipolar diffusion. is evaluated be 0.12 eV.
The impact of H atoms and O impurities on the adsorption stability work function cesiated Mo (001) surface are investigated in this paper through DFT calculations. 53 structures with different coverages constructed work. Two types co-deposition considered: Cs-O (or Cs-H) bonds (1) leaning towards (2) perpendicular to surface. Our results demonstrate that minimum corresponds a 0.5 ML coverage Cs for any O) when tilted. Compared pure deposition, increases at low or saturated coverage, while...
Abstract A radiofrequency (RF) ion source with a megawatt power extraction, thunder I, has been developed for the neutral beam injector (NBI) on HL-2A tokamak. full solid-state RF generator output of 80 kW and frequency 2 MHz was built by an combiner using 8 modules P = 10 kW. The line electric efficiency whole reaches 92% its voltage standing wave ratio (VSWR) is 1.01, thus no water-cooling system supplied. quartz vessel inner diameter 250 mm directly adopted resisting atmospheric pressure,...
The effects of increased magnetic field and pressure on electron transport with a rotating spoke in cylindrical anode layer Hall plasma accelerator are investigated by three-dimensional particle-in-cell numerical simulation. azimuthal rotation the has frequency 12.5 MHz. It propagates direction E × B drift at speed ∼1.0 106 m/s (about 37% speed). Local charge separation occurs because local density concentration is accompanied an almost uniform ion distribution. non-axisymmetrical...
Welding is essential to construction and safe operation of fusion reactors. Besides materials themselves, small specimen test technologies (SSTT) are also evaluate bonding properties the joints for application. In present study, flat indentation method based on energy–density equivalent principle was utilized evaluation an electron beam welded (EBW) joint a reduced-activation ferritic/martensitic (RAFM) steel, CLF-1. The describes relationships among material parameters Hollomon's power law,...
We studied the work function of cesium deposition and co-deposition with electronegative element on plasma grid (PG) using first-principles calculations. The impurity particles may exist in background vacuum chamber wall, PG will be affected. results indicate that minimum functions pure Mo (110), W (112) are reached at a partial monolayer. They 1.66 eV (σ = 0.56 θ), 1.69 0.75 1.75 0.88 respectively. An appropriate model consisting elements can further decrease function. coverage both 0.34 θ...
A current drop is found when the discharge voltage increased in cylindrical anode layer hall plasma accelerator and three-dimensional particle-in-cell simulation performed to investigate phenomenon. The results which agree with experiments show that ion density region does not always rise reaches a maximum value at appropriate voltage. This phenomenon considered be macroscopic ramification of change ionization cross section as electron energy varies. With regard Ar+, largest appears 45–110...
Characteristics of ionic plasmas, observed in a high-density hydrogen negative ion source, are investigated with multi-diagnostics system. The plasma, which consists positive- and negative-ions significantly low-density electrons, is generated the extraction region, from ions extracted through plasma grid. density, i.e., as high order 1×1017m−3, measured cavity ring-down spectroscopy, while electron density lower than 1×1016m−3, confirmed millimeter-wave interferometer. Reduction at...