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Title: Modified Faraday cup

Abstract

A tomographic technique for measuring the current density distribution in electron beams using electron beam profile data acquired from a modified Faraday cup to create an image of the current density in high and low power beams. The modified Faraday cup includes a narrow slit and is rotated by a stepper motor and can be moved in the x, y and z directions. The beam is swept across the slit perpendicular thereto and controlled by deflection coils, and the slit rotated such that waveforms are taken every few degrees form 0.degree. to 360.degree. and the waveforms are recorded by a digitizing storage oscilloscope. Two-din-tensional and three-dimensional images of the current density distribution in the beam can be reconstructed by computer tomography from this information, providing quantitative information about the beam focus and alignment.

Inventors:
 [1];  [2];  [2]
  1. (Pleasanton, CA)
  2. (Livermore, CA)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
870599
Patent Number(s):
US 5554926
Application Number:
08/509552
Assignee:
Regents of University of California (Oakland, CA) LLNL
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
modified; faraday; cup; tomographic; technique; measuring; current; density; distribution; electron; beams; beam; profile; data; acquired; create; image; power; narrow; slit; rotated; stepper; motor; moved; z; directions; swept; perpendicular; thereto; controlled; deflection; coils; waveforms; degrees; form; degree; 360; recorded; digitizing; storage; oscilloscope; two-din-tensional; three-dimensional; images; reconstructed; computer; tomography; information; providing; quantitative; focus; alignment; perpendicular thereto; profile data; data acquired; quantitative information; tomographic technique; three-dimensional images; stepper motor; current density; electron beam; electron beams; faraday cup; density distribution; beam profile; modified faraday; z directions; storage oscilloscope; providing quantitative; slit perpendicular; slit rotated; computer tomography; narrow slit; deflection coils; beam focus; power beams; dimensional image; degrees form; digitizing storage; deflection coil; three-dimensional image; z direction; dimensional images; /324/250/

Citation Formats

Elmer, John W., Teruya, Alan T., and O'Brien, Dennis W.. Modified Faraday cup. United States: N. p., 1996. Web.
Elmer, John W., Teruya, Alan T., & O'Brien, Dennis W.. Modified Faraday cup. United States.
Elmer, John W., Teruya, Alan T., and O'Brien, Dennis W.. Mon . "Modified Faraday cup". United States. doi:. https://www.osti.gov/servlets/purl/870599.
@article{osti_870599,
title = {Modified Faraday cup},
author = {Elmer, John W. and Teruya, Alan T. and O'Brien, Dennis W.},
abstractNote = {A tomographic technique for measuring the current density distribution in electron beams using electron beam profile data acquired from a modified Faraday cup to create an image of the current density in high and low power beams. The modified Faraday cup includes a narrow slit and is rotated by a stepper motor and can be moved in the x, y and z directions. The beam is swept across the slit perpendicular thereto and controlled by deflection coils, and the slit rotated such that waveforms are taken every few degrees form 0.degree. to 360.degree. and the waveforms are recorded by a digitizing storage oscilloscope. Two-din-tensional and three-dimensional images of the current density distribution in the beam can be reconstructed by computer tomography from this information, providing quantitative information about the beam focus and alignment.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 1996},
month = {Mon Jan 01 00:00:00 EST 1996}
}

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