Patent ID: 7078712

Claim:
An ion implantation system suitable for use in implanting ions into one or more workpieces and for detecting particles on the workpieces comprising: an ion implanter for producing a beam of ions and directing the beam of ions downstream toward the one or more workpieces held within an end station, the end station comprising: a rotary scan transport for providing rotary motion to the workpieces and an encoder count of the radial scan position; and a linear scan transport for providing reciprocating linear motion to the workpieces and an encoder count of the linear scan position; and an in-situ monitoring system associated with the end station suitable for detecting the particles on the one or more workpieces during ion implantation comprising: a light source for providing a fixed beam of illumination to a portion of one of the workpieces; two detectors symmetrically affixed on either side of the light source and both oriented toward the illuminated portion of the workpiece for capturing scattered light from opposite viewing angles of the illuminated portion of the workpiece; and a processor configured to analyze the intensity of the scattered light detected from the illuminated workpiece, and for mapping the light detected to a unique position on a workpiece determined by the encoder counts associated with the rotary and linear transports.