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ELECTRON BEAM SOURCE INCLUDING A PILOT NONTHERMIONIC, ELECTRON SOURCE

  • US 3,610,986 A
  • Filed: 05/01/1970
  • Issued: 10/05/1971
  • Est. Priority Date: 05/01/1970
  • Status: Expired due to Term
First Claim
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1. An electron beam gun comprising:

  • (A) a pilot gun having (i) An enclosure provided with a relatively low-pressure ionizable gaseous medium providing the source of electrons from said pilot gun;

    (ii) A pilot cathode positioned in one wall of said enclosure, said pilot cathode having a concave surface to give a convergent beam of electrons having a focal point beyond the Faraday dark space;

    (iii) A pilot anode positioned in said wall around and spaced from said pilot cathode the potential difference between said pilot cathode and pilot anode providing the electron accelerating voltage for the electrons generated from said gaseous medium. (B) A main cathode at the same potential as said pilot anode positioned in the wall opposite said pilot cathode and at a distance from said pilot cathode beyond the Faraday dark space such that said main cathode is bombarded by electrons from said pilot gun and thereby itself emits electrons. (C) A main anode spaced from said main cathode and having a high electron accelerating voltage therebetween to accelerate the electrons emitted from said main cathode toward a workpiece.

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