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:
-
- San Jose, CA
- Livermore, CA
- Issue Date:
- Research Org.:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- OSTI Identifier:
- 870248
- Patent Number(s):
- 5483036
- Assignee:
- Sandia Corporation (Albuquerque, NM)
- Patent Classifications (CPCs):
-
B - PERFORMING OPERATIONS B23 - MACHINE TOOLS B23K - SOLDERING OR UNSOLDERING
G - PHYSICS G01 - MEASURING G01T - MEASUREMENT OF NUCLEAR OR X-RADIATION
- 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}
}
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