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Charge and fluence lifetime measurements of a dc high voltage GaAs photogun at high average current

Description: GaAs-based dc high voltage photoguns used at accelerators with extensive user programs must exhibit long photocathode operating lifetime. Achieving this goal represents a significant challenge for proposed high average current facilities that must operate at tens of milliamperes or more. This paper describes techniques to maintain good vacuum while delivering beam, and techniques that minimize the ill effects of ion bombardment, the dominant mechanism that reduces photocathode yield of a GaAs-b… more
Date: April 1, 2011
Creator: J. Grames, R. Suleiman, P.A. Adderley, J. Clark, J. Hansknecht, D. Machie, M. Poelker, M.L. Stutzman
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Pulsed X-ray Characterization of Stripline Micro-Channel Plate Gated Imager

Description: We report on characterization of x-ray imaging arrays developed by National Security Technologies, LLC. These devices are based on a microchannel plate (MCP) with a conventional glass microchannel structure, but the top and bottom conductive coatings, rather than covering the entire area, are configured into several (4 to 8) parallel strips. Since the bias voltage is a pulse launched from one end, these operate as striplines; relative delays between these pulses give different active exposure t… more
Date: March 30, 2011
Creator: F. J. Goldin, D. V. Morgan, K. J. Moy
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Mixed Stream Test Rig (MISTER) Startup Report

Description: This report describes the work accomplished to date to design, procure, assemble, authorize, and startup the Mixed Stream Test Rig (MISTER) at the Idaho National Laboratory (INL). It describes the reasons for establishing this capability, physical configuration of the test equipment, operations methodology, initial success, and plans for completing the initial 1,000 hour test.
Date: February 1, 2011
Creator: Park, Charles
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Six Thousand Electrochemical Cycles of Double-Walled Silicon Nanotube Anodes for Lithium Ion Batteries

Description: Despite remarkable progress, lithium ion batteries still need higher energy density and better cycle life for consumer electronics, electric drive vehicles and large-scale renewable energy storage applications. Silicon has recently been explored as a promising anode material for high energy batteries; however, attaining long cycle life remains a significant challenge due to materials pulverization during cycling and an unstable solid-electrolyte interphase. Here, we report double-walled silicon… more
Date: August 18, 2011
Creator: Wu, H
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Calibration and performance of a secondary emission chamber as a beam intensity monitor

Description: We report on a study of the behavior of a secondary emission chamber (SEC). We show the dependence of the SEC signal on the charge and velocity of the primary beam for beams of protons, and heavy ions including Helium, Neon, Chlorine and Iron. We fill the SEC with a selection of different gases including Hydrogen, Helium, Nitrogen, Argon, and air, studying the SEC response when it is acting as an ion chamber. We also investigate the behavior of the SEC at intermediate pressures between 10{sup -… more
Date: March 28, 2011
Creator: Sivertz, M.; Chiang, I-H, & Rusek, A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Final Technical Report: Effects of Impurities on Fuel Cell Performance and Durability

Description: The main objectives of this project were to investigate the effect of a series of potential impurities on fuel cell operation and on the particular components of the fuel cell MEA, to propose (where possible) mechanism(s) by which these impurities affected fuel cell performance, and to suggest strategies for minimizing these impurity effects. The negative effect on Pt/C was to decrease hydrogen surface coverage and hydrogen activation at fuel cell conditions. The negative effect on Nafion compo… more
Date: November 11, 2011
Creator: Goodwin, James G., Jr.; Colon-Mercado, Hector; Hongsirikarn, Kitiya & Zhang, Jack Z.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

THE EFFECT OF VARIOUS DETECTOR GEOMETRIES ON THE PERFORMANCE OF CZT USING ONE CRYSTAL

Description: CdZnTe (CZT) continues to be a major thrust interest mainly due to its potential application as a room temperature radiation detector. The performance of CZT detectors is directly related to the charge collection ability which can be affected by the configuration of the electrical contact. The charge collection efficiency is determined in part by the specific geometry of the anode contact which serves as the readout electrode. In this report, contact geometries including single pixel, planar, c… more
Date: June 21, 2011
Creator: Washington, A.; Duff, M. & Teague, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

On the preparation of TiAl alloy by direct reduction of the oxide mixtures in calcium chloride melt

Description: In recent years, TiAl-based intermetallic alloys are being increasingly considered for application in areas such as (i) automobile/transport sector (passenger cars, trucks and ships) (ii) aerospace industry (jet engines and High Speed Civil Transport propulsion system) and (iii) industrial gas turbines. These materials offer excellent (i) high temperature properties (at higher than 6000C) (ii) mechanical strength and (iii) resistance to corrosion and as a result have raised renewed interest. Th… more
Date: November 1, 2011
Creator: Tripathy, Prabhat K. & Fray, Derek J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Development of Cdznte Radiation Detectors

Description: Cadmium Zinc Telluride (CdZnTe or CZT) is a very attractive material for room-temperature semiconductor detectors because of its wide band-gap and high atomic number. Despite these advantages, CZT still presents some material limitations and poor hole mobility. In the past decade most of the developing CZT detectors focused on designing different electrode configurations, mainly to minimize the deleterious effect due to the poor hole mobility. A few different electrode geometries were designed … more
Date: October 23, 2011
Creator: Bolotnikov, A.; Camarda, G.; Hossain, A.; Kim, K. H.; Yang, G.; Gul, R. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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