Abstract
In the last several years, Kirkpatrick‐Baez (K‐B) mirror systems have been extensively applied as two‐dimensional x‐ray focusing elements on x‐ray beamlines at low emittance, third generation, synchrotron radiation facilities. The design of the two GM/CA CAT insertion device beamlines at the Advanced Photon Source at Argonne National Laboratory for macromolecular crystallography includes a K‐B mirror system situated in each of the experimental stations. Ray‐tracing studies have been performed using SHADOW (V2.3.2) to investigate the dependence of the focal distance on the surface figure error obtained from LTP metrology measurements. Additionally, a procedure has been developed to allow one to change the mirror focal positions to provide a beam of given dimensions at a fixed position before or after the focal position. The GM/CA CAT has been established by the National Institutes of Health’s (NIH) National Institute of General Medical Sciences (NIGMS), and the National Cancer Institute (NCI) to build and operate a national user facility for crystallographic structure determination of biological macromolecules by X‐ray diffraction.
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