Patent ID: 9530614
Filing Date: 2016-12-27
CPC Classification: G01Q,H01J

Claim Text:
1. A charged particle beam device comprising: a charged particle source configured to emit a charged particle beam; a condenser lens configured to converge the charged particle beam; an aberration corrector having multiple stages of multiple poles and configured to correct an aberration of an optical unit; an aberration corrector power supply configured to generate power to be applied to the multiple poles according to the power supply control value; an aberration coefficients estimation unit configured to measure a plurality of aberration coefficients of the optical unit when the power supply control value is applied to the multiple poles from the aberration corrector power supply; an aberration correction target estimation unit configured to select an aberration coefficient from the plurality of aberration coefficients; an aberration correction amount estimation unit that determines a multipole control value, of a current or a voltage, to correct the selected aberration coefficient based on the selected aberration coefficient; an aberration corrector power output value measurement unit configured to measure the present value of the power supply control value applied to the multiple poles from the aberration corrector power supply; a parasitic aberration adjustment amount estimation unit that determines a parasitic aberration adjustment amount based on the measured value of the power supply control value applied to the multiple poles and the multipole control value to adjust an aberration resulting from applying power corresponding to the multipole control value to the aberration corrector; and an arithmetic device configured to compute a power supply control value for aberration correction to be applied to the multiple poles by adding the multipole control value to the parasitic aberration adjustment amount together, wherein the parasitic aberration adjustment amount estimation unit stores and holds data that indicates a correspondence between the multipole control value and the parasitic aberration adjustment amount that is necessary to adjust a parasitic dipole field or a parasitic quadrupole field generated when power corresponding to the multipole control value is applied to the aberration corrector.