Patent ID: 8035080

Claim:
A method of operating a high energy ion implanter comprising: generating an ion beam of a beam species from an ion source; mass analyzing the generated ion beam; selecting positive ions of a first positive charge state into an accelerator; accelerating the positive ions of the first positive charge state through at least one of a first plurality of accelerator stages located within the accelerator to a first kinetic energy level; stripping the accelerated positive ions with a charge stripper located within the accelerator, thereby converting the positive ions of the first positive charge state to positive ions of a second positive charge state, wherein the first positive charge state is different from the second positive charge state and wherein stripping is performed with a stripping efficiency that is based upon the first kinetic energy level and provides more positive ions of the second positive charge state than at the ion source to increase beam current at a second energy higher than the first kinetic energy level obtained with positive ions of the first charge state; and accelerating the positive ions of the second positive charge state through at least one of a second plurality of accelerator stages located within the accelerator.