Patent ID: 8987680
Filing Date: 2015-03-24
Classification: G21K,H01J

Abstract:
1. A multipole measurement apparatus comprising: a radiation optical system operable to radiate a primary charged particle beam; a two-dimensional position detector operable to detect a position coordinate on a surface onto which the primary charged particle beam is radiated; a condenser lens operable to converge the primary charged particle beam onto the detection surface of the two-dimensional position detector; a space between the condenser lens and the two-dimensional position detector, for allowing insertion of an aberration corrector having multipoles of multiple stages therein; deflection coils operable to control a position of incidence and a convergence angle of the primary charged particle beam to the aberration corrector when the aberration corrector is inserted in the space; an aberration-corrector controller operable to control an intensity and a type of a multipole excited in the aberration corrector; and a memory operable to store a relationship between the position of incidence and the convergence angle of the primary charged particle beam to the aberration corrector of the deflection coils in a state where a given multipole is excited by the aberration-corrector controller and a radiation position detected by the two-dimensional position detector, wherein the incidence of the primary charged particle beam to the aberration corrector by deflection is performed at a plurality of points, and a relationship among the position of incidence and the convergence angle of the primary charged particle beam to the aberration corrector performed at the plurality of points, the radiation position, and the multipole is measured in a state in which a multipole field is excited and in a state in which no multipole field is excited, thereby multipole components included in the state in which the multipole field is excited are extracted.