Patent Number: 
Section: claims

1. A method for conducting uniform dose ion implantation of a target with an ion beam, the method comprising the steps of:providing an ion beam;determining an ion beam profile of the ion beam;determining a scan velocity profile based on the ion beam profile, the scan velocity profile dictating a non-uniform scan velocity across the target to provide a uniform dose;implanting the target using the ion beam including varying a scan velocity according to the scan velocity profile;rotating the target from a rotationally-fixed orientation about a location substantially at a center of the target to a subsequent rotationally-fixed orientation; andrepeating the implanting step. 2. The method of claim 1, further comprising the steps of:repeating the rotating step after the repeated implanting step;determining whether to change the scan velocity profile after the repeated rotating step for the subsequent rotationally-fixed orientation; andrepeating the scan velocity profile determining step in the case that the scan velocity profile is to be changed such that the scan velocity profile is different for a subsequent implanting step. 3. The method of claim 2, wherein the scan velocity profile is also based on the rotationally-fixed orientation of the target. 4. The method of claim 2, wherein the scan velocity profile change determination includes determining whether an average current density exceeds a threshold. 5. The method of claim 1, wherein the rotation is about 90°. 6. The method of claim 1, wherein the ion beam profile determining step includes measuring the ion beam using a multi-pixel Faraday detector. 7. The method of claim 1, wherein the ion beam is at least partially un-tuned. 8. The method of claim 1, wherein the ion beam profile includes a current density. 9. The method of claim 1, wherein the scan velocity profile determining step includes:identifying a starting scan velocity profile;computing a dose on the target at each position for the scan velocity profile combined with the ion beam profile, and computing a standard deviation of the dose;determining whether the standard deviation meets a target criterion;in the case that the standard deviation meets the target criterion, proceeding with the implanting step, otherwise determining whether a number of allowed attempts to find a satisfactory scan velocity profile has been exceeded; andin the case that the number of allowed attempts has been exceeded, indicating an error, otherwise computing a new scan velocity profile. 10. The method of claim 9, further comprising the step of determining whether the new scan velocity profile is acceptable and corralling the new scan velocity profile if the new scan velocity profile is unacceptable. 11. The method of claim 10, further comprising the steps of repeating the scan velocity determining step in the case that the new scan velocity profile is corralled or acceptable. 12. The method of claim 9, wherein the new scan velocity profile computing step includes one of making a systematic modification of the starting scan velocity profile, and computing a multi-dimensional search algorithm. 13. An apparatus for conducting uniform dose ion implantation of a target with an ion beam, the apparatus comprising:a source of an ion beam for implanting the target, the ion beam having an ion beam profile;a target scan translator configured to move the target through the ion beam according to a scan velocity profile that is based on the ion beam profile, the scan velocity profile dictating a non-uniform scan velocity across the target;a target rotator configured to rotate the target from the rotationally-fixed orientation about a location substantially at a center of the target to a subsequent rotationally-fixed orientation between at least two implanting scans; anda processor configured to operate the target scan translator and the target rotator to provide a substantially uniform dose of ions across the target. 14. The apparatus of claim 13, wherein the processor further operates to determine whether to change the scan velocity profile after the target rotator rotates the target to the subsequent rotationally-fixed orientation. 15. The apparatus of claim 13, wherein the scan velocity profile is also based on the rotationally-fixed orientation of the target. 16. The apparatus of claim 13, wherein the target rotator rotates the target about 90°. 17. The apparatus of claim 13, wherein the ion beam is at least partially un-tuned. 18. The apparatus of claim 13, wherein the ion beam profile includes a current density. 19. The apparatus of claim 13, further comprising means for determining the scan velocity profile including:means for identifying a starting scan velocity profile;means for computing a dose on the target at each position for the scan velocity profile combined with the ion beam profile, and computing a standard deviation of the dose;means for determining whether the standard deviation meets a target criterion;means for determining whether a number of allowed attempts to find a satisfactory scan velocity profile has been exceeded in the case that the standard deviation does not meet the target criterion, and otherwise proceeding with implanting; andmeans for computing a new scan velocity profile in the case that the number of allowed attempts has not been exceeded, and otherwise indicating an error. 20. The apparatus of claim 19, further comprising means for determining whether the new scan velocity profile is acceptable and corralling the new scan velocity profile if the new scan velocity profile is unacceptable. 21. The apparatus of claim 19, wherein the new scan velocity profile computing means includes one of: means for making a systematic modification of the starting scan velocity profile, and means for computing a multi-dimensional search algorithm. 22. A computer program product comprising a computer useable medium having computer readable program code embodied therein for controlling an ion implanter system to provide a substantially uniform dose to a target, the ion implanter system including a target translator configured to move the target through the ion beam and a target rotator configured to rotate the target about a location substantially at a center of the target, the program product comprising:program code configured to determine an ion beam profile of the ion beam;program code configured to determine a scan velocity profile based on the ion beam profile, the scan velocity profile dictating a non-uniform scan velocity across the target to be used by the target translator to provide a substantially uniform dose to the target; andprogram code configured to determine whether to rotate the target using the target rotator between ion implant procedures from a rotationally-fixed orientation about a location substantially at a center of the target to a subsequent rotationally-fixed orientation.