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Controlling Charged Particle Beams

Sanderson, Allan, Ribton, Colin Nigel

A method and apparatus for causing a beam of charged particles (4) to impinge on a surface of a workpiece (1, 1A) along an impingement path (2) such as a weld joint line is described The apparatus comprises an electron beam source (3); a first control assembly (24) for guiding the beam along the joint line (2) and for deflecting the beam at successive positions onto the joint line; and a second control assembly (22) into which the beam (4) is launched for deflecting the beam at selected positions into the first control assembly.

EP 87300472 A

1989

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