Patent ID: 8027812
Filing Date: 2011-09-27
Classification: G06F

Abstract:
1. A charge trajectory calculating method of calculating, by simulation, trajectories of charges scattered by irradiating a target object with a charged beam, the method comprising: setting a simulation region, which corresponds to an existence region of the target object; dividing the simulation region into a plurality of segment regions; calculating, by a Monte Carlo calculation, the trajectories of charges scattered by irradiating an inside of a predetermined segment region with the charged beam; calculating, based on the Monte Carlo calculation, a charge distribution which occurs in the simulation region by irradiating the inside of the predetermined segment region with the charged beam; calculating, based on the charge distribution, a potential distribution which occurs in the simulation region by irradiating the inside of the predetermined segment region with the charged beam; calculating, based on the potential distribution or the charge distribution, function values of an approximate function of the potential distribution or the charge distribution; calculating, based on the function values of the approximate function, the potential distribution which occurs in the simulation region by irradiating an outside of the predetermined segment region with the charged beam; and calculating, by the Monte Carlo calculation, and based on the potential distribution calculated based on the function values of the approximate function, the trajectories of charges scattered by irradiating the outside of the predetermined segment region with the charged beam.