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High-frequency ion source

  • US 5,017,835 A
  • Filed: 11/20/1989
  • Issued: 05/21/1991
  • Est. Priority Date: 03/18/1987
  • Status: Expired due to Term
First Claim
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1. High-frequency ion source for the generation of large-area ion beams, the ion source having a vessel for substances, particularly gases, to be ionized, high-frequency energy being capable of being inductively coupled into a plasma and a d.c. magnetic field being superimposed on the plasma, characterized in that a plasma excitation at gas pressures in a high-vacuum can be carried out in a tubular plasma vessel (1) by electron cyclotron waves which are resonant with respect to the dimensions of the plasma vessel, the plasma vessel (1) being matched to the shape of the desired ion beam and being clamped between a carrier plate (7) and a closure plate (8), and an intermediate circuit (5) capable of being resonated being arranged between a high-frequency generator (4) and a load circuit coil (2), a weak, d.c. magnetic field, which is directed perpendicular to the axis of the load circuit coil (2) based on the theory of electron cyclotron wave resonance and has a magnitude given by the theory, being generated by a Helmholtz coil pair (6) whose geometric configuration is matched to the shape of the plasma vessel (1), and an ion-optical system for ion extraction (9), consisting of a plurality of electrodes and matched to the geometry of the desired ion beam, being arranged in the carrier plate (7).

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