Patent ID: 9058957
Filing Date: 2015-06-16
Classification: H01J

Abstract:
1. A charged particle beam apparatus which requires a focus adjustment and a stigma adjustment when observing a sample, comprising: a lens system that focuses a charged particle beam on the sample; an X-stigmator that adjusts an X-stigma; a Y-stigmator that adjusts a Y-stigma; a control unit that controls a focus adjustment of the lens system, an X-stigma adjustment of the X-stigmator and a Y-stigma adjustment of the Y-stigmator; a storage unit that stores a practice-purpose image corresponding to each group of the focus adjustment, the X-stigma adjustment and the Y-stigma adjustment which are determined in advance; an operation unit that sets the focus adjustment, the X-stigma adjustment and the Y-stigma adjustment according to a user's operation; a display unit that displays the practice-purpose image read out from the storage unit corresponding to the group of the focus adjustment, the X-stigma adjustment and the Y-stigma adjustment which are set by the operation unit; and an evaluation unit that evaluates deviation from an optimum condition by comparing a predetermined set of optimum parameters with the focus adjustment, the X-stigma adjustment and the Y-stigma adjustment which are set by the user's operation.