ABERRATION EVALUATION PATTERN, ABERRATION EVALUATION METHOD, ABERRATION CORRECTION METHOD, ELECTRON BEAM DRAWING APPARATUS, ELECTRON MICROSCOPE, MASTER, STAMPER, RECORDING MEDIUM, AND STRUCTURE

摘要

A method of evaluating astigmatism of an irradiation system irradiating an electron beam is disclosed. In this method, a figure pattern consisting of plural (for example, four) concentric circles is formed on a reference sample“WP”and an image (scanned image) is formed based on an electron signal obtained by scanning the electron beam onto the reference sample“WP”. In the scanned image, the image has a blur in a region with its longitudinal direction parallel to the generating direction of the astigmatism and the size of the blur depends on magnitude of the astigmatism. Therefore, the direction and the magnitude of the astigmatism of the irradiation system of an irradiation apparatus can be detected based on the obtained scanned image.