A5030861207- Gyrotron and Vacuum Electronics Research
- Ionosphere and magnetosphere dynamics
- Plasma Diagnostics and Applications
- Pulsed Power Technology Applications
- Millimeter-Wave Propagation and Modeling
- Terahertz technology and applications
- Astrophysics and Cosmic Phenomena
- Particle accelerators and beam dynamics
- Astro and Planetary Science
- Electronic Packaging and Soldering Technologies
- Atomic and Molecular Physics
- Radiation Therapy and Dosimetry
- Material Properties and Applications
- UAV Applications and Optimization
- Solar and Space Plasma Dynamics
- Diamond and Carbon-based Materials Research
- Energy Harvesting in Wireless Networks
- Radiation Detection and Scintillator Technologies
- Radiation Effects and Dosimetry
- Induction Heating and Inverter Technology
- Laser-induced spectroscopy and plasma
- Radiation Effects in Electronics
- Luminescence Properties of Advanced Materials
- Laser-Plasma Interactions and Diagnostics
Institute of Applied Physics and Computational Mathematics
2020-2024
North China Electric Power University
2020-2022
The actual working environment of spacecraft in space is highly harsh, among which radiation the primary harmful environmental factor leading to failure orbit. This study investigates field emission, multipacting, and outgassing ionization as effects electromagnetic on thermal control layer (TCL) spacecraft. Based particle-in-cell (PIC) simulation method coupled with Monte Carlo collisions (MCCs), a 2-D model particle motion vacuum created evolution point discharge process irradiation...
It is known that Earth's atmosphere and geomagnetic field affect the propagation of an artificial electron beam; many previous studies have neglected effect their variation on dynamics. In this article, parameters in envelope equations were modified according to International Geomagnetic Reference Field (IGRF) model MSIS-90 model; then, was constructed study beam atmosphere. Calculation beam's energy loss radial expansion showed intensity can be main reason for pinch altitudes above 150 km,...
Research on the location and shape of a beam spot at target altitude can lay foundation for understanding diagnosing long-range propagation relativistic electron beams. Only few studies have focused this approach. In study, terrestrial atmosphere with 3-D geomagnetic field was constructed in accordance International Geomagnetic Reference Field model relevant model. Monte Carlo simulations were applied to (1-10 MeV) beams range 200-300 km. The results showed that when various parameters...
It is known that ion-focused regime (IFR) can effectively suppress expansion of a relativistic electron beam (REB). Using the particle-in-cell Monte Carlo collision (PIC-MCC) method, we numerically investigate propagation an REB in neutral gas. The results demonstrate body charge neutralization and stable IFR be established. As result, transverse dimensions longitudinal velocities keep close to initial parameters. We also calculate current factors REB. Combined with envelope equations,...
In this article, the influence of plasma induced by alpha particles distributed on surface aircraft reflection characteristics incident electromagnetic waves is studied, spatial distribution electron density under different atmospheric densities simulated, reflectance to radar and terahertz at radioactive activity flight altitude calculated, anti-stealth are analyzed. The results show that 1 mCi/cm <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Spacecraft operate in complex space environments filled with a variety of natural or anthropogenic particles and fields, which may trigger outgassing breakdown on their surfaces thus lead to spacecraft failures orbit. The physical process the atmosphere is more than vacuum, requires consideration electron–neutral collisions electron attachment effects addition field emission secondary multiplication. In this article, based particle-in-cell (PIC), 2-D simulation model electromagnetically...
In this paper, the propagation loss of 0.14 THz signal propagating for 27 km at sea is measured experimentally and compared with simulation results model in International Telecommunication Union-Radiocommunication Sector (ITU-R). The show that average difference between simulated experimental values received power -5.2 dB, all overestimate loss. Considering evaporation duct ubiquitous marine atmosphere may affect characteristics terahertz wave, a new computational proposed. More than half...
Abstract In geostationary orbits and other quasi-vacuum environments, relativistic electron beams are affected by the initial emittance space charge effects during propagation process, resulting in beam quality degradation. Furthermore, axial energy distribution change transient electromagnetic effect caused current changes head tail regions of also cause to expand affect its quality. this study, particle-in-cell method was used construct a long-range model vacuum environment. By calculating...
Abstract Active sounding experiments, including tracing magnetic field lines and magnetospheric sounding, may be accomplished in the GEO environment by active emission of high-power electron beams. The continual beam pulses during such experiments result accumulation positive charges on spacecraft surface a rise potential, which might prohibit normal succeeding pulses. plasma contactor has been shown to reliable method for neutralizing potential. But as charging effect brought high-current...
Abstract The emission of artificial electron beams causes an active spacecraft charging effect that poses challenges for beam sounding experiments. Plasma contactors have been suggested as a potential solution to this issue based on theoretical and simulation studies, but the impact these potentials in complex space environments remains unexplored. This paper investigates fast under action plasma geostationary Earth orbit environment by using two‐dimensional Particle‐in‐Cell model. We...