Patent ID: 8680479
Filing Date: 2014-03-25
Classification: H01J

Abstract:
1. A charged particle analyzer having a charged particle optical system including an electrode in which an outer electrode and an inner electrode are paired for forming a sector-shaped electrostatic field for making a charged particle fly on an arc orbit, and having an opening for allowing a charged particle to pass through or for allowing electromagnetic wave or a particle beam to pass through for monitoring a status of a charged particle, the opening being formed in the outer electrode and positioned on a straight line extending from an optical axis, the charged particle, the electromagnetic wave, or the particle beam entering or exiting from the arc orbit through the opening along the straight line, the charged particle analyzer comprising: an electric field correction electrode placed around the opening, arranged along the straight line, and fronting a space between the outer electrode and the inner electrode; and a voltage applier for applying a predetermined direct-current voltage to the electric field correction electrode, wherein a disturbance in the sector-shaped electric field due to the opening is corrected by the electric field correction electrode.