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Title: Electron beam machining using rotating and shaped beam power distribution

An apparatus and method for electron beam (EB) machining (drilling, cutting and welding) that uses conventional EB guns, power supplies, and welding machine technology without the need for fast bias pulsing technology. The invention involves a magnetic lensing (EB optics) system and electronic controls to: 1) concurrently bend, focus, shape, scan, and rotate the beam to protect the EB gun and to create a desired effective power-density distribution, and 2) rotate or scan this shaped beam in a controlled way. The shaped beam power-density distribution can be measured using a tomographic imaging system. For example, the EB apparatus of this invention has the ability to drill holes in metal having a diameter up to 1000 .mu.m (1 mm or larger), compared to the 250 .mu.m diameter of laser drilling.
 [1];  [2]
  1. (Pleasanton, CA)
  2. (Livermore, CA)
Issue Date:
OSTI Identifier:
Regents of University of California (Oakland, CA) LLNL
Patent Number(s):
US 5534677
Contract Number:
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
electron; beam; machining; rotating; shaped; power; distribution; apparatus; method; drilling; cutting; welding; conventional; guns; supplies; machine; technology; fast; bias; pulsing; involves; magnetic; lensing; optics; electronic; controls; concurrently; bend; focus; shape; scan; rotate; protect; gun; create; desired; effective; power-density; controlled; measured; tomographic; imaging; example; ability; drill; holes; metal; diameter; 1000; larger; compared; 250; laser; magnetic lens; electron beam; density distribution; beam power; power distribution; power supplies; tomographic imaging; laser drilling; welding machine; /219/250/