Global to push GA events into
skip to main content

Title: System for tomographic determination of the power distribution in electron beams

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-dimensional 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)
Issue Date:
OSTI Identifier:
869713
Assignee:
Regents of University of California (Oakland, CA) LLNL
Patent Number(s):
US 5382895
Contract Number:
W-7405-ENG-48
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
tomographic; determination; power; distribution; electron; beams; technique; measuring; current; density; beam; profile; data; acquired; modified; faraday; cup; create; image; narrow; slit; rotated; stepper; motor; moved; z; directions; swept; perpendicular; thereto; controlled; deflection; coils; waveforms; degrees; form; degree; 360; recorded; digitizing; storage; oscilloscope; two-dimensional; 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; power distribution; beam profile; modified faraday; z directions; storage oscilloscope; providing quantitative; slit perpendicular; slit rotated; computer tomography; narrow slit; deflection coils; tomographic determination; beam focus; power beams; dimensional image; degrees form; digitizing storage; deflection coil; three-dimensional image; z direction; dimensional images; /324/250/