Patent ID: 9595417
Date: 2017-03-14
CPC Classifications: H01J

Claim:
1. A charged particle beam device, comprising: a primary beam source device adapted for generating a primary charged particle beam; a mirror corrector device adapted for providing compensation of at least one of spherical or chromatic aberrations; a first beam separator adapted for transmitting the primary charged particle beam to the mirror corrector device and for separating the primary charged particle beam from a compensating primary charged particle beam reflected by the mirror corrector device, wherein the first beam separator has at least a magnetic deflector configured to generate at least one dipole magnetic field; a transfer lens adapted for focusing the primary charged particle beam emitted from the primary beam source device into a center of the first beam separator; an objective lens adapted for focusing the compensating primary charged particle beam onto a specimen, wherein the objective lens is a retarding field lens configured for decelerating the charged particles of the compensating primary charged particle beam to a landing energy of approximately 1 keV or less; and a second beam separator adapted for transmitting the compensating primary charged particle beam to the specimen and for separating the compensating primary charged particle beam from a secondary charged particle beam originating from the specimen, wherein the first beam separator and the second beam separator are dispersion free combined magnetic-electrostatic deflection units.