Patent ID: 9624570
Date: 2017-04-18
CPC Classifications: C23C,H01J

Claim:
1. A filtered ion source comprising: a first end and a second end, wherein the first end is closed and the second end is open to a work area; a consumable electrode source material comprising an evaporation surface facing the second end, the consumable electrode source material having a cross-sectional length; a first permanent magnet disposed between the consumable electrode source material and the work area a first persistent magnetic field between the evaporation surface and the work area a shielding surface having a first end and a second end and positioned to leave a first space adjacent to said first end of the shielding surface and a second space adjacent to said second end of the shielding surface, the first space and the second space sized to permit the passage of at least one macroparticle, the shielding surface disposed between the first permanent magnet and the consumable electrode source material, the shielding surface facing the evaporation surface and having a cross-sectional length that is equal to or greater than the cross-sectional length of the consumable source material; a second permanent magnet disposed concentrically around the first permanent magnet a second persistent magnetic field between the evaporation surface and the work area, wherein the magnetic moment of the first permanent magnet and the magnetic moment of the second permanent magnet are aligned; a third permanent magnet disposed underneath the evaporation surface, the third permanent magnet having a reverse polarity relative to the first persistent magnetic field and the second persistent magnetic field; and a null point disposed between the evaporation surface and the first permanent magnet.