Patent ID: 9574984
Date: 2017-02-21
CPC Classifications: G01N,H01J

Claim:
1. A particle beam forming device for forming either a linear or conical particle beam from a particle source in which particles are dispersed in a gas, the particle beam forming device comprising: a reduced-pressure vessel in which a pressure is reduced; a particle beam generating unit, which has a first end arranged outside of the reduced-pressure vessel and a second end arranged inside the reduced-pressure vessel, and which captures the particle source from outside the reduced-pressure vessel and introduces the particle beam into the reduced-pressure vessel; and a particle beam evaluating unit for evaluating a spatial distribution of the particle beam inside the reduced-pressure vessel, wherein the particle beam evaluating unit comprises: wherein the signal processing unit calculates a spatial spread of the particle beam based on at least one of an intensity-spanning frequency distribution and a pulse width-spanning frequency distribution of the scattered light, and based on a relationship between a predetermined spatial intensity distribution of the light and the spatial spread of the particle beam, and wherein the signal processing unit calculates the spatial spread of the particle beam at a plurality of locations following a direction of travel of the particle beam based on signals from the plurality of locations, and calculates a spread angle of the particle beam from the spatial spread at each location.