Patent ID: 8097866
Filing Date: 2012-01-17
Classification: H01J

Abstract:
1. A method for measuring properties of a particle beam having a plurality of particles, the method comprising: generating the particle beam and directing the particle beam along a beam path; disposing at least one particle beam detecting system on at least a portion of the beam path to receive at least a portion of the generated particles, the particle beam detecting system comprising an entrance aperture, an exit aperture, and at least one detector defining a channel in communication with the entrance aperture and the exit aperture, and wherein at least one particle pass through the at least one particle beam detecting system via the entrance aperture, the channel and the exit aperture of the at least one particle beam detecting system; rotating the particle beam detecting system from a first position to a second position during receiving the at least portion of the generated particles; and detecting at least a portion of the received particles during the rotating with the at least one detector, wherein less particles pass through the at least one particle beam detecting system, via the exit aperture, during the first position than during the second position, and wherein more particles are detected by the detector of the particle beam detecting system during the second position than by the detector during the first position.