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

Patent · Mon Jan 01 00:00:00 EST 1996

OSTI ID:870248

Giedt, Warren H ^[1]; Campiotti, Richard ^[2]

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1. San Jose, CA
2. Livermore, CA

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.

• Research Organization: Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
• DOE Contract Number: AC04-76DP00789
• Assignee: Sandia Corporation (Albuquerque, NM)
• Patent Number(s): US 5483036
• OSTI ID: 870248
• Country of Publication: United States
• Language: English

Related Subjects

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
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