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Measurements of “dark currents” in pressurized SF6 in high uniform electric field are carried out. To identify the mechanism involved, the influences of electric field, gas pressure and relative humidity are investigated. The experimental results support the hypothesis of emission of charged water clusters from electrodes. A simple model describing the above mechanism is developed, which allows accounting...
A simulation study at Ka-band window frequency at 35 GHz has been carried out to analyse and explore the DC and high frequency properties of cubic polytypic wide band gap semiconductor DDR impatts based on 3C-SiC and ZnB-GaN. The chosen structure is a flat profile p+pnn+ DDR impatt which is optimised at a particular bias current density with respect to efficiency and output power including the effect...
We demonstrate the InGaAsN PIN structures grown by MBE with photoresponse of approximately 1.3 μm and optimized by post growth annealing. The assessment of the annealing study was carried out by comparing the dark current density and photocurrent spectra of the as-grown and annealed samples. The dark current for an optimally annealed InGaAsN PIN is approximately 2 μAcm-2 at an electric field of 100...
The emission of excited neutrals and positive ions from the liquid metal surface in electric fields depends on thermal field processes. Such processes include interaction between the liquid metal surface and electron flux of high power density exceeding a threshold value P*, evaporation of neutrals activated by metal electron subsystem excitation, and lastly, field ionization of evaporating neutrals...
Summary form only given: The nanoparticle field extraction thruster (NanoFET) is an electrostatic micro/nano-particle accelerator technology that is being developed for use as an electric propulsion system. Conceptually, NanoFET employs micro/nano-electromechanical systems (MEMS/NEMS) to transport, charge, and accelerate conductive particles. The propellant, via piezoelectric actuations, is fed from...
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