×

Ion flow forming method and apparatus

  • US 6,136,387 A
  • Filed: 07/27/1998
  • Issued: 10/24/2000
  • Est. Priority Date: 06/25/1998
  • Status: Expired due to Term
First Claim
Patent Images

1. An ion flow forming method of attracting ions from a plasma generated in a plasma generation chamber and forming a flow of the ions, comprising the steps of:

  • (a) generating the plasma in said plasma generation chamber having a plasma diffusion outlet port;

    (b) moving at least a portion of the plasma, generated in said plasma generation chamber, outside said plasma generation chamber through said plasma diffusion outlet port by diffusion;

    (c) extracting the ions by applying, to the plasma which has moved outside said plasma generation chamber, an electric field in a first direction to repel electrons in the plasma toward said plasma diffusion outlet port and to attract the ions in the plasma in a second direction opposite to the electrons, by applying in a pulsed manner first and second voltages to respective of first and second electrodes, wherein the first voltage is higher than the second voltage, and the first electrode and the second electrode are sequentially arranged between respective of the plasma diffusion outlet port of the plasma generation chamber and a target object; and

    (d) directing the attracted ions toward the target object.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×