Design of mixed KB-KBA microscope for multi-keV dynamic imaging diagnostics

A type of mixed KB-KBA microscope for dynamic imaging diagnostics at multi-keV was proposed to obtain large field, high spatial resolution, high light efficiency and spectral resolution. It consists of two spherical mirrors with single-layer in tangential direction to obtain high spatial resolution and a spherical mirror with periodic multilayer in sagittal direction to ensure high light efficiency and spectral resolution. The problems of low effective solid angle, uneven brightness and limited effective object field existing in traditional single-layer and periodic multilayer KBA microscope for dynamic imaging diagnostics at multi-keV were solved. The optical design of mixed KB-KBA microscope at 2.5 keV and 4.3 keV was carried out by the ray-tracing model under the consideration of thin-films reflectance, and the spatial resolution better than 5 m within 1.4 mm object field in tangential direction and effective solid angle larger than 210-7 sr were achieved.