A set of precision horizontal and vertical white-beam slits has been designed for t h e Advanced Photon Source (APS) X-ray undulator beamlines a t Argonne National Laboratory. There are several new design concepts applied in this slit set, including: grazing-incidence knife-edge configuration

The Advanced Photon Source (APS) has initiated a design standardization and modularization activity for the APS synchrotron radiation beamline components. These standard components are included in components library, sub-components library and experimental station library. This paper briefly describes these standard components using both technical specifications and side view drawings. DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. by a contractor of the U. S. Government under contract No. W-31-104ENG-38. Accordingly, the U. S. Government retains a nonexclusive. royalty-free license to publish or reproduce the published form of this contribution, or allow others to do SO, for DISCLAIMER Portions of this document may be illegible in electronic image products. Images are produced from the best available original document.

A new filter has been designed at Argonne National Laboratory that is intended for the use in undulator/wiggler beamlines at the Advanced Photon Source. The water-cooled frame allows up to four individual filter foil banks simultaneously in the beam path. Additionally, the bottom of each frame holds two thin (20 pm) uncooled carbon filters in tandem for low-energy filtering. Therefore, a maximum of 625 filter selection combinations is theoretically possible. The design is intelligent, compact and modular, with great flexibility for the users. To prevent accidental movement of the filter, effort has been taken to provide a mechanically locked, fail-safe actuator system. Programming aspects are under development as part of our general personnel and equipment protection system. Aspects of the design and operational principles of the filter are presented in this paper. Conceptual Design The effective use of filters in a general experimental beamline requires a large variety of different filters to cover the entire beam spectrum. The filter assembly described is designed to provide filtering with cutoffs up to 30 keV and above. To provide additional flexibility to the experimenters, a modular design was required. This allows the option of adding or exchanging individual filters with minimum effort. In addition, this Esembly earl be build as a double filter bank assembly or a quadruple filter bank assembly, depending on the needs of the individual beamline. The design had to be UHV compatible. Water cooling was requited for each filter foil (Fig.l and Fig.2). Finally, the requirements called for individual motor controlled actuators for each filter bank. These actuators are to be linked to the APS equipment protection system.

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