Patent ID: 7507977
Filing Date: 2009-03-24
Classification: H01J

Abstract:
1. A method of quenching an arc in an ion implantation system and repainting the ion beam to recover any dose loss during such arcing using an arc quenching circuit associated with a high voltage supply for an electrode of the ion implantation system comprising: horizontally scanning a wafer in front of the ion beam; vertically scanning the wafer in front of the ion beam; detecting a current or voltage change associated with the arc at the electrode; monitoring horizontal and vertical scan motions to obtain initial and final scan positions associated with the detection of the arc; controlling a HV switch connected between the high voltage supply and the electrode to open when the arc is detected in order to interrupt the high voltage supply to the electrode and to quench the arc; controlling the HV switch to close when the arc is not detected in order to connect the high voltage supply to the electrode and to reestablish the ion beam; and repainting the ion beam after an arc, the repainting process comprising: