FRONT-END SUPPORT SYSTEMS FOR THE ADVANCED-PHOTON-SOURCE

The support-system designs for the Advanced Photon Source (APS) front ends are complete and will be installed in 1994. These designs satisfy the positioning and alignment requirements of the front-end components to be installed inside the storage-ring tunnel, including the photon beam position monitors, fixed masks, photon and safety shutters, fitters, windows, and differential pumps. Other components include beam transport pipes and ion pumps. The designs comprise 3-point kinematic mounts and single-axis supports to satisfy various multi-direction positioning requirements from coarse to ultra-precise. The confined space inside the storage-ring tunnel has posed engineering challenges in the design of these devices, in view of the fact that some components weigh as much as 500 kg. These challenges include designing for mobility during commissioning and initial alignment, mechanical and thermal stability, and precise low-profile vertical and horizontal positioning. As a result, novel stages and kinematic mounts have been constructed using modular and standard designs. This paper will discuss the diverse group of support systems, including specifications and performance data of the prototypes.