To verify the process of laser-cleaning on metal cathodes we performed a combined photoemission (PE) and scanning electron microscope (SEM) study. We followed the laser-cleaning procedure on thin Lead films arc-deposited on Mo-substrates by means of photoemission in the photon energy range of 16 – 140 eV and determined the surface roughness before and after laser irradiationwith whitelight-inte...

Charge neutralization of an In-FEEP thruster was demonstrated with three different electron sources by zeroing the floating potential of the thruster and neutralizer system. The three cathodes used in the investigation include a mixed metal thermionic cathode, a carbon nanotube field emission cathode, and a Spindt-type Mo field emission array cathode. The field emission cathodes significantly i...

in this study the characteristics of two different kinds of la0.6sr0.4co0.2fe0.8o3 (lscf) powders, one in-house synthesized powder by a co-precipitation method and another one purchased from fuel cell materials co. (fcm co., usa), were compared. the co-precipitated powder was prepared by using ammonium carbonate as precipitant with a nh4+/no3- molar ratio of 2 and calcination at 1000c for 1 h....

This research aim to optimize two kinds of cathode material, LNCA and lithium manganese rich materials (LNMC), which are potential cathodes of EV since their high theoretical specific capacity. However several drawbacks need to be improved such as their low cycling performance, unstable structure, and fast voltage fading. In this project doping other ions (Na, K, Al, Sn) replacing Ni and Mn ion...

A sensitive open-type calorimeter was used to measure excess heat production during electrolysis in Li2SO4/H2O solution with Pt-anode and Pd-Ni thin film cathodes 9000 Å thick, sputtered on Al2O3 substrate. In order to estimate the actual performance and possible measurement errors during electrolysis in the calorimeter used, including heat convection, bubbling and possible H2+O2 recombination,...

Thin film photocathodes have been developed both for gas and vacuum based photodetectors. Over the last years we have gained experience in fabricating large area reflective CsI and semi-transparent monoand bialkali-cathodes, i.e. Rb2Te and K2CsSb: Today we are producing stable cathodes with excellent quantum efficiency for large MWPC based pad detectors and Hybrid Photodiodes on a routine basis...

Filaments 1 and 2 were coated with BaO 50%0, SrO 25%, CaO 25%, Filaments 3 and 4 with BaO 50%0, SrO 50%, and Filaments 5 and 6 with CaO alone. It appears that for Wehnelt cathodes the values 0 and bR/e show a good correspondence. This is a strong point in favor of the view that the emission of electrons from Wehnelt cathodes is due to a similar mechanism to that causing the emission from heated...

The scope of the current research is to characterize aging mechanisms in LiFePO4 battery cathodes at the nanometer length scale. For this purpose, we wish to use Electron Energy Loss Spectroscopy (EELS) in the low loss regime in the Transmission Electron Microscope (TEM) to identify and quantify the phases formed in the cathode as the battery is discharged. The above phase identification and qu...

A formal implementation of the Fowler-Nodheim equation to emission characteristics of diamond coated cold cathodes gives values of the work function which depend on surface curvature of the coating, thus making it incorrect. Experiments with diamond coated Si tips having different coating radii have shown, that their emissivity depends on the radius of the Si tip rather than on the radius of th...

Electron injectors delivering relativistic electron beams with very high brightness are essential for a number of current and proposed electron accelerator applications. These high brightness beams are generally produced from photoemission cathodes. We formulate a limit on the electron beam brightness from such cathodes set by the transverse thermal energy of the electrons leaving the photocath...