Patent ID: 7947129
Filing Date: 2011-05-24
Classification: H01J

Abstract:
1. A cleaning optimized method for use with an ion source apparatus in which a plasma is formed by supplying an implantation ion source gas to a plasma chamber, and ion beams extracted from the plasma pass through an extraction electrode system comprising a plurality of electrodes for creating an electric field to which ion source materials from the ion beam accrete to form an insulation layer of ion source material, wherein the method comprising the steps of: supplying a rare gas instead of the ion source gas to the plasma chamber thus forming plasma based on the rare gas and extracting a rare gas ion beam from the plasma based on the rare gas; and changing a beam diameter of the rare gas ion beam colliding onto the insulation layer by adjusting an extraction voltage of the extraction electrode system or adjusting a supply amount of the rare gas to maximize removal of the insulation layer of the ion source material on the extraction electrode system as the rare gas ion beam collides with the insulation layer on the extraction electrode system.