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Title: Proposal for a High-Brightness Pulsed Electron Source

Abstract

We propose a novel scheme for a high-brightness pulsedelectron source, which has the potential for many useful applications inelectron microscopy, inverse photo-emission, low energy electronscattering experiments, and electron holography. A description of theproposed scheme is presented.

Authors:
; ; ;
Publication Date:
Research Org.:
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA (US)
Sponsoring Org.:
USDOE Director, Office of Science
OSTI Identifier:
890084
Report Number(s):
LBNL-60066
R&D Project: Z3THLE; BnR: YN0100000
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Conference
Resource Relation:
Conference: The Physics and Applications of High BrightnessElectron Beams, Erice, Italy, October 9-14, 2005
Country of Publication:
United States
Language:
English
Subject:
43; electron source high brightness

Citation Formats

Zolotorev, Max, Commins, Eugene D., Heifets, Sam, and Sannibale,Fernando. Proposal for a High-Brightness Pulsed Electron Source. United States: N. p., 2006. Web.
Zolotorev, Max, Commins, Eugene D., Heifets, Sam, & Sannibale,Fernando. Proposal for a High-Brightness Pulsed Electron Source. United States.
Zolotorev, Max, Commins, Eugene D., Heifets, Sam, and Sannibale,Fernando. Wed . "Proposal for a High-Brightness Pulsed Electron Source". United States. doi:. https://www.osti.gov/servlets/purl/890084.
@article{osti_890084,
title = {Proposal for a High-Brightness Pulsed Electron Source},
author = {Zolotorev, Max and Commins, Eugene D. and Heifets, Sam and Sannibale,Fernando},
abstractNote = {We propose a novel scheme for a high-brightness pulsedelectron source, which has the potential for many useful applications inelectron microscopy, inverse photo-emission, low energy electronscattering experiments, and electron holography. A description of theproposed scheme is presented.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Mar 15 00:00:00 EST 2006},
month = {Wed Mar 15 00:00:00 EST 2006}
}

Conference:
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  • We propose a novel scheme for a high-brightness pulsed electron source, which has the potential for many useful applications in electron microscopy, inverse photo-emission, low energy electron scattering experiments, and electron holography. A description of the proposed scheme is presented.
  • The Relativistic Electron-beam Experiment, or REX accelerator, is a pulsed-power source capable of driving a 100-ohm load at 5 MV, 50 kA, 45 ns (FWHM) with less than a 10-ns rise and 15-ns fall time. This paper describes the pulsed-power modifications, modelling, and extensive measurements on REX to allow it to drive high impedance (100s of ohms) diode loads with a shaped voltage pulse. A major component of REX is the 1.83-m-diam {times} 25.4-cm-thick Lucite insulator with embedded grading rings that separates the output oil transmission line from the vacuum vessel that contains the re-entrant anode and cathode assemblies. Amore » radially tailored, liquid-based resistor provides a stiff voltage source that is insensitive to small variations of the diode current and, in addition, optimizes the electric field stress across the vacuum side of the insulator. The high-current operation of REX employs both multichannel peaking and point-plane diverter switches. This mode reduces the prepulse to less than 2 kV and the postpulse to less than 5% of the energy delivered to the load. Pulse shaping for the present diode load is done through two L-C transmission line filters and a tapered, glycol-based line adjacent to the water PFL and output switch. This has allowed REX to drive a diode producing a 4-MV, 4.5-kA, 55-ns flat-top electron beam with a normalized Lapostolle emittance of 0.96 mm-rad corresponding to a beam brightness in excess of 4.4 {times} 10{sup 8} A/m{sup 2} {minus}rad{sup 2}. 6 refs., 13 figs.« less
  • The REX machine at Los Alamos is being used to generate a 4-MW, 5-kA, 50-ns electron beam. The beam is produced by a planar velvet cathode, accelerated through a foilless anode aperture, and transported by an air core magnetic lens. Extensive measurements of the time-resolved (<1 ns) properties of the beam using a streak camera and high speed electronic diagnostics have been made. These parameters include beam current voltage, current density, and emittance for a single cathode/anode configuration. Results indicate beam brightness in excess of 10/sup 8/A/m/sup 2/-rad/sup 2/. Numerical simulations of the experiment have been performed with ISIS, amore » time-dependent PIC code, and are in good agreement with the measurements. This electron beam source is being considered as an injector to a linear induction accelerator and can be operated at higher voltages and currents as a stand-alone flash x-ray machine. 7 refs., 8 figs.« less
  • An optically initiated hollow cathode electrode source has been demonstrated to produce high brightness electron beams in a low presssure background gas. Three phases of beam production have been identified, first a 3A, 20nsec, 45keV, 10[sup 10]A/m[sup 2]rad[sup 2] initial beam, second a 70A, 100nsec,20keV, 10[sup 11]A/m[sup 2]rad[sup 2] hollow cathode produced beam and third a 200A, steady state, 500eV superemissive cathode produced beam. A steady state hollow cathode produced beam of [similar to]100mA has also been observed. An experimental characterization of the electron beam source is presented.