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Title: Method of automatic measurement and focus of an electron beam and apparatus therefor

Abstract

An electron beam focusing system, including a plural slit-type Faraday beam trap, for measuring the diameter of an electron beam and automatically focusing the beam for welding. Beam size is determined from profiles of the current measured as the beam is swept over at least two narrow slits of the beam trap. An automated procedure changes the focus coil current until the focal point location is just below a workpiece surface. A parabolic equation is fitted to the calculated beam sizes from which optimal focus coil current and optimal beam diameter are determined.

Inventors:
 [1];  [2]
  1. San Jose, CA
  2. Livermore, CA
Publication Date:
Research Org.:
Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
OSTI Identifier:
870248
Patent Number(s):
US 5483036
Assignee:
Sandia Corporation (Albuquerque, NM)
DOE Contract Number:  
AC04-76DP00789
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; automatic; measurement; focus; electron; beam; apparatus; focusing; including; plural; slit-type; faraday; trap; measuring; diameter; automatically; welding; size; determined; profiles; current; measured; swept; narrow; slits; automated; procedure; changes; coil; focal; location; below; workpiece; surface; parabolic; equation; fitted; calculated; sizes; optimal; workpiece surface; electron beam; beam trap; narrow slit; beam focus; beam focusing; /219/250/324/

Citation Formats

Giedt, Warren H, and Campiotti, Richard. Method of automatic measurement and focus of an electron beam and apparatus therefor. United States: N. p., 1996. Web.
Giedt, Warren H, & Campiotti, Richard. Method of automatic measurement and focus of an electron beam and apparatus therefor. United States.
Giedt, Warren H, and Campiotti, Richard. Mon . "Method of automatic measurement and focus of an electron beam and apparatus therefor". United States. https://www.osti.gov/servlets/purl/870248.
@article{osti_870248,
title = {Method of automatic measurement and focus of an electron beam and apparatus therefor},
author = {Giedt, Warren H and Campiotti, Richard},
abstractNote = {An electron beam focusing system, including a plural slit-type Faraday beam trap, for measuring the diameter of an electron beam and automatically focusing the beam for welding. Beam size is determined from profiles of the current measured as the beam is swept over at least two narrow slits of the beam trap. An automated procedure changes the focus coil current until the focal point location is just below a workpiece surface. A parabolic equation is fitted to the calculated beam sizes from which optimal focus coil current and optimal beam diameter are determined.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {1}
}

Patent:

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