A5008635583- Plasma Diagnostics and Applications
- Plasma Applications and Diagnostics
- Vacuum and Plasma Arcs
- Nuclear physics research studies
- Atomic and Molecular Physics
- Electrohydrodynamics and Fluid Dynamics
- Medical Research and Treatments
- Advanced Sensor Technologies Research
- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Radiation Detection and Scintillator Technologies
- Advanced Data Storage Technologies
- Semiconductor materials and devices
- Neutrino Physics Research
- Dust and Plasma Wave Phenomena
- Metal and Thin Film Mechanics
- Astronomical and nuclear sciences
Beihang University
2023
Yunnan University
2021
Institute of Modern Physics
2021
Chinese Academy of Sciences
2021
University of Pennsylvania
2019
Abstract Hall thruster is a type of electric propulsion system used for spacecraft. The study the plume, which plasma, reveals thruster’s performance. Images operating can be found from various online sources, plumes are typically transparent with slight blue or green hue. However, some colorful instead being monochromatic, distinguishable regions. In this study, we investigated xenon plasma color using collisional radiative model and explained appearance plumes. We show that atoms ions...
Abstract Hall thruster clusters or arrays are a flexible option for controlling thrust vector, extending lifetime, enhancing power of the propulsion system. However, coupling relationship between thrusters and hollow cathodes becomes more complicated due to intersected plasma plumes multiple thrusters. In this study, probes were utilized experimentally investigate discharge characteristics plume structure cluster under different cathode position conditions. Experiments have shown that...
The $\ensuremath{\beta}$-delayed two-proton ($\ensuremath{\beta}2p$) decay of $^{27}\mathrm{S}$ was studied using a state-of-the-art silicon array and Clover-type HPGe detectors. An energy peak at 6372(15) keV with branching ratio 2.4(5)% in the decay-energy spectrum identified as transition via isobaric-analog state $^{27}\mathrm{P}$ to ground $^{25}\mathrm{Al}$ $\ensuremath{\beta}$ $^{27}\mathrm{S}$. Two-proton angular correlations were measured by study mechanism emission. Based on...
A detailed $\ensuremath{\beta}$-decay spectroscopic study of $^{22}\mathrm{Al}$ was performed at the Radioactive Ion Beam Line in Lanzhou. With $\ensuremath{\beta}\text{\ensuremath{-}}\ensuremath{\gamma}$-particle coincidence measurement by a high-resolution DSSD particle detection array and high efficiency $\ensuremath{\gamma}$-ray array, total eight excited states $^{22}\mathrm{Mg}$ fed Gamow-Teller transitions newly identified. The one-proton, two-proton, $\ensuremath{\alpha}$ decays IAS...
Abstract A fully kinetic axisymmetric particle-in-cell model is employed to simulate and study the detachment processes of electrons in propulsive magnetic nozzle. The ratio adopted evaluate extent which detach from field. theoretical expression for electron derived indicates that driven by two mechanisms: inertia effect gyro-viscous effect. simulation results show direction are outward upstream inward downstream. In addition, dominating mechanisms effect, while equally, if not more,...
Abstract Vacuum arc thruster (VAT) is a type of pulsed electric propulsion device that generates thrust based on vacuum discharges, it has great candidate for micro-newton force applications in orbit. To improve both the and longevity VAT, novel dual-anode structure, comprising central anode ring anode, was developed. We conducted an investigation into plasma discharge acceleration process within influence magnetic nozzle. The architecture resulted reduction initial impedance, thereby...
Abstract A 2-D axisymmetric transient coupled plasma-thermal model is developed to simulate the plasma behavior during self-sustained discharge of hollow cathodes, which presents a complete cathode structure and energy transfer processes in multiphysics fields. The has been validated by quantitative agreement between simulation results experimental data on emitter temperature at NSTAR cathode. effects thermal protection design, operating conditions, geometric design performance are analysed...
Abstract The high specific impulse and efficiency of the applied-field magnetoplasmadynamic thruster (AF-MPDT) make it one most promising electric thrusters in deep space exploration. However, crucial electromagnetic acceleration mechanisms are still not clearly investigated, which limits performance improvement. mechanism is closely related to current path magnetic field distribution plume. Experiments conducted using a water-cooled Hall probe steady-state AF-MPDT radial, azimuthal axial...
Abstract Hollow cathodes serve as the electron source for thrusters and are critical elements of electric propulsion system. To overcome limitations small orifice blockage in discharge path conventional hollow cathode on ignition performance, a dual trigger electrode heater-based with sub-millimeter columnar bias inserted into emitter cavity is proposed. Both experiments simulations indicate that provides faster time self-healing ability from poisoning. A coupled plasma-thermal model reveals...
Cytokines are molecular messengers that mediate cell-to-cell communication in an autocrine and paracrine fashion.Development of cytokine-based drugs requires a deep understanding cytokine biology continuous engineering effort to fine-tune pharmacological properties elicit potent antitumor response while keeping toxicity minimum.To date, high dose bolus IL-2 for metastatic melanoma INF-α renal carcinoma have been approved as single agents cancer therapy.In additions, immune cytokines,...