Patent ID: 9704687
Date: 2017-07-11
CPC Classifications: H01J

Claim:
1. A charged particle beam application device for converging a charged particle beam generated by a charged particle source on a sample by using an objective lens, the device comprising: an aberration generating element installed between the charged particle beam source and the objective lens; a tilt-use deflector installed between the aberration generating element and the objective lens; a deflection aberration control unit for controlling the aberration generating element; a first electromagnetic field superposing multipole installed between the aberration generating element and the objective lens; and an electromagnetic field superposing multipole control unit for controlling the first electromagnetic field superposing multipole, wherein the first electromagnetic field superposing multipole is controlled to deflect respective orbits of a low speed electron beam and a high speed electron beam such that a controlled distance between said orbits within the objective lens is less than an uncontrolled distance between said orbits within the objective lens, thereby controlling a high-order chromatic aberration, and wherein the first electromagnetic field superposing multipole is controlled to cause no orbit change in a main electron beam, the main electron beam being disposed between the low speed electron beam and the high speed electron, and wherein the first electromagnetic field superposing multipole is controlled to cause the low speed electron beam and the high speed electron beam to maintain a substantially constant distance with respect to each other until reaching the objective lens.