Patent ID: 6262425
Filing Date: 2001-07-17
Classification: B82Y,H01J

Abstract:
A method of aligning a charged particle beam system having a plurality of deflectors arranged along a path of a charged particle beam, said method comprising the steps ofpositioning a slit aperture along said path of said charged particle beam at a position corresponding to at least one of said plurality of deflectors, said slit having a width corresponding to a desired deflected trajectory of said charged particle beam,statically deflecting said charged particle beam to a maximum deflection in a first direction using said at least one of said plurality of deflectors and all deflectors prior to said at least one of said plurality of deflectors along said path of said charged particle beam,scanning said charged particle beam over edges of said slit aperture,recording current of said charged particle beam intercepted by said slit aperture,statically deflecting said charged particle beam to a maximum deflection in a direction opposite to said first direction using said at least one of said plurality of deflectors and all deflectors prior to said at least one of said plurality of deflectors along said path of said charged particle beam,scanning said charged particle beam over edges of said slit aperture,recording current of said charged particle beam intercepted by said slit aperture during said scanning steps, andcorrecting said deflected trajectory of said charged particle beam in accordance with said current recorded in said recording steps.