13 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Cathodes"  
Results: 1 - 13
open access

Oxide cathode lifetime improvements at RTNS-II

Description: Results are reported for an ongoing effort to optimize D/sup +/ beam production by the MATS-III ion source used at the RTNS-II. The oxide cathode assembly originally designed for lower power operation has been modified and redesigned for higher electron current yield, longer life and serviceability. A factor of 2.5 has been gained in cathode lifetime due to these changes. The details of the changes and results and benefits in operation and performance are given. In addition, the technique used … more
Date: September 29, 1986
Creator: Massoletti, D.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Chemical Processing Technology Quarterly Progress Report, January-March 1962

Description: The processing of Al fuel, principally of the MTR-ETR type, is reported. Processing rate averaged 90% of flow sheet values for the entire operating period, and a U recovery of 99.85% was achieved. Aqueous Zr fuel processing studles continued with the objective of adapting the HF process to continuous dissolution-complexing in order to increase the capacity of the ICPP process while using as much existing equipment as possible to minimize costs. Good results were indicated in a 190-hr run dissol… more
Date: June 29, 1962
Creator: Bower, J. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Bibliography and author index for electrical discharges in vacuum (1897 to 1980)

Description: This bibliography covers the field of electrical discharges in vacuum, comprising both electrical breakdown in vacuum and vacuum arcs. A brief review section lists some review papers which would be helpful to the novice in this field. The bulk of the paper consists of bibliographic listings, arranged by year of publication and within each year, alphabetically by first author. An author index refers one to all papers authored or coauthored by a particular person. There are 2450 papers listed thr… more
Date: January 29, 1982
Creator: Miller, H. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Origins of the Rate Enhancement in LiNi0.4Co0.2-yAlyMn0.4O2 (0<y<_0.2) Cathode Materials

Description: Recently, much research has been directed towards finding a replacement cathode material for LiCoO{sub 2} combining high performance with lower cost and toxicity. One promising candidate material is the mixed transition metal oxide LiNi{sub 0.4}Co{sub 0.2}Mn{sub 0.4}O{sub 2}, which delivers 180 mAh/g below 4.4 V versus Li/Li{sup +} (1, 2). However, in this material, there is 4% anti-site cation mixing, which hinders the mobility of lithium within the lattice, adversely affecting its rate perfor… more
Date: May 29, 2008
Creator: Doeff, Marca M; Wilcox, James & Doeff, Marca M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Final Scientific Report : Development of Transition Metal/ Chalcogen Based Cathode Catalysts for PEM Fuel Cells

Description: The aim of this project was to investigate the potential for using base metal sulfides and selenides as low cost replacements for precious metal catalysts, such as platinum, currently being used in PEM fuel cells. The approach was to deposit thin films of the materials to be evaluated onto inert electrodes and evaluate their activity for the cathode reaction (oxygen reduction) as well as ex-situ structural and compositional characterization. The most active materials identified are CoS2 and the… more
Date: February 29, 2008
Creator: Campbell, Stephen, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Using a Quasipotential Transformation for Modeling Diffusion Media inPolymer-Electrolyte Fuel Cells

Description: In this paper, a quasipotential approach along with conformal mapping is used to model the diffusion media of a polymer-electrolyte fuel cell. This method provides a series solution that is grid independent and only requires integration along a single boundary to solve the problem. The approach accounts for nonisothermal phenomena, two-phase flow, correct placement of the electronic potential boundary condition, and multilayer media. The method is applied to a cathode diffusion medium to explor… more
Date: August 29, 2008
Creator: Weber, Adam Z. & Newman, John
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Quarterly progress report for Q2 FY06 for Complex Transient Events in Materials Studied Using Ultrafast Electron Probes and Terascale Simulation (FWP SCW0289)

Description: In this quarter (Q2 FY06), the DTEM underwent a substantial reconfiguration of its laser systems. The cathode laser system was changed to provide greater numbers of electrons per pulse by lengthening the time duration of the pulse to 30 ns. The greater number of electrons per pulse has allowed us to acquire high quality pulsed images and diffraction patterns. The spatial resolution in the single pulsed image has been measured at better than 20 nm. The diffraction patterns are now more comparabl… more
Date: March 29, 2006
Creator: Campbell, G. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Ferroelectric Cathodes in Transverse Magnetic Fields

Description: Experimental investigations of a planar ferroelectric cathode in a transverse magnetic field up to 3 kGs are presented. It is shown that the transverse magnetic field affects differently the operation of ferroelectric plasma cathodes in ''bright'' and ''dark'' modes in vacuum. In the ''bright'' mode, when the surface plasma is formed, the application of the transverse magnetic field leads to an increase of the surface plasma density. In the ''dark'' mode, the magnetic field inhibits the develop… more
Date: July 29, 2002
Creator: Dunaevsky, Alexander; Raitses, Yevgeny & Fisch, Nathaniel J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Simulation, Generation, and Characterization of High Brightness Electron Source at 1 GV/m Gradient.

Description: This paper describes computer simulations and measurements on an electron bunch from a pulsed, high gradient gap. MAFIA and PBGUNS were used to calculate the emittance, brightness and energy spread of the electron beam for peak currents ranging from 10A to 1 kA and pulse durations ranging from 0.3 ps to 10 ps. Under optimum conditions, normalized emittance of 10{sup -7} {pi} m-rad, beam brightness of 3 x 10{sup 15} A/(m-rad){sup 2} and energy spread of 0.15% were obtained. A pulsed high voltage… more
Date: March 29, 1999
Creator: Srinivasan-Rao, T.; Schill, J.; Ben-Zvi, Ilan; Batchelor, K.; Farrell, J. P.; Smedley, J. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

In-Situ Cleaning of Metal Cathodes using a Hydrogen Ion Beam

Description: Metal photocathodes are commonly used in high-field RF guns because they are robust, straightforward to implement and tolerate relatively poor vacuum compared to semi-conductor cathodes. However these cathodes have low quantum efficiency (QE) even at UV wavelengths, and still require some form of cleaning after installation in the gun. A commonly used process for improving the QE is laser cleaning. In this technique the UV drive laser is focused to a small diameter close to the metal's damage t… more
Date: March 29, 2006
Creator: Dowell, D. H.; King, F. K.; Kirby, R. E. & Schmerge, J. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Recent developments at the cathode processor for spent fuel treatment.

Description: As part of the spent fuel treatment program at Argonne National Laboratory, a vacuum distillation process is being employed for the recovery of uranium following an electrorefining process. Distillation of a molten salt electrolyte, primarily consisting of a eutectic mixture of lithium and potassium chlorides with minor amounts of fission product chlorides, from uranium is achieved by a batch operation called cathode processing. Described in this paper are recent developments, both equipment an… more
Date: July 29, 2002
Creator: Westphal, B. R.; Vaden, D.; Hua, T. Q.; Willit, J. L. & Laug, D. V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
Back to Top of Screen