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

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 is disclosed. 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. 12 figs.
Inventors:
;
Issue Date:
OSTI Identifier:
170473
Assignee:
Sandia Corp., Albuquerque, NM (United States) SNL; SCA: 360101; PA: EDB-96:027576; SN: 96001517574
Patent Number(s):
US 5,483,036/A/
Application Number:
PAN: 8-142,077
Contract Number:
AC04-76DP00789
Resource Relation:
Other Information: PBD: 9 Jan 1996
Research Org:
AT&T Corporation
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ELECTRON BEAM WELDING; PROCESS CONTROL; ELECTRON BEAMS; FOCUSING; BEAM MONITORS; BEAM PROFILES; AUTOMATION