Patent ID: 8476589
Filing Date: 2013-07-02
Classification: G21K,H01J

Abstract:
1. A particle beam microscope having a beam path, the microscope comprising: a magnetic lens having an optical axis and at least one front pole piece arranged in the beam path along the optical axis at a distance upstream of an object plane; an object holder, which is configured for mounting an object to be inspected at a point of intersection between the optical axis and the object plane; a vacuum enclosure defining a vacuum space and having an opening, wherein the front pole piece of the magnetic lens and the object are located within the vacuum space; and an X-ray detection unit; wherein the X-ray detection unit comprises: a detector mount; a first X-ray detector mounted on the detector mount and having a first radiation-sensitive substrate; a second X-ray detector mounted on a detector mount and having a second radiation-sensitive substrate; a flange mounted on and sealed against the vacuum enclosure, wherein the flange carries the detector mount such that at least one of a portion of the flange and the detector mount extend through the opening of the vacuum enclosure; wherein the first and second X-ray detectors are arranged such that a first elevation angle between a first straight line extending through the point of intersection and a center of the first substrate and the object plane differs from a second elevation angle between a second straight line extending through the point of intersection and a center of the second substrate and the object plane by more than 14°; and wherein the flange and the opening have a diameter such that the X-ray detection unit can be removed from the particle beam microscope without dismantling the vacuum enclosure.