Abstract
A set of precision horizontal and vertical white-beam slits has been designed for the Advanced Photon Source x-ray undulator beamlines at Argonne National Laboratory. There are several new design concepts applied in this slit set, including a grazing-incidence knife-edge configuration to minimize the scattering of x rays downstream, enhanced heat transfer tubing to provide water cooling, and a secondary slit to eliminate the thermal distortion on the slit knife edge. The novel aspect of this design is the use of two L-shaped knife-edge assemblies, which are manipulated by two precision X-Z stepping linear actuators. The principal and structural details of the design for this slit set are presented in this paper.
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