Patent ID: 7023003

Claim:
An ion implanter for implanting ions into a target wafer comprising: an ion source; an atomic mass unit (AMU) analyzing magnet having a fixed radius R am ; an ion extraction voltage source, a communication interface adapted to monitor implantation parameters including an extraction voltage V E of the source of implanting ions and a real-time magnetic flux density B of a magnetic field of the AMU analyzing magnet generated by a beam current flowing through the analyzing magnet, an equipment server having a data log, wherein the equipment server is in communication with the ion implanter and is in further communication with the communication interface for monitoring parameters communicated from the ion implanter to the equipment server data log during operation of the ion implanter, wherein the parameters are the B and the V E of the source of implanting ions from the ion implanter, wherein the ion implanter uses a plurality of implantation data to ensure that an AMU of an ion being implanted has less than a 0.5 AMU difference from an AMU of a desired ion to be implanted, wherein the plurality of implantation data is selected from data relating to a plurality of ions each having predefined AMUs, each of the plurality of ions associated with a monitored B and a monitored V E ; means for calculating an estimated radius R e of ions being implanted by the ion implanter; means for determining an offset value between R am and R e ; and means for signaling an alarm if the absolute value of the offset, |R am −R e |, is larger than a predetermined radius tolerance level L.