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 component s to be installed inside the storage-ring tunnel, including the photon beam position monitors, fixed masks, photon and safety shutters, fitt ers, windows, and differential pumps. Other components include beam tr ansport pipes and ion pumps. The designs comprise 3-point kinematic mo unts and single-axis supports to satisfy various multi-direction posit ioning requirements from coarse to ultra-precise. The confined space i nside the storage-ring tunnel has posed engineering challenges in the design of these devices, in view of the fact that some components weig h as much as 500 kg. These challenges include designing for mobility d uring commissioning and initial alignment, mechanical and thermal stab ility, and precise low-profile vertical and horizontal positioning. As a result, novel stages and kinematic mounts have been constructed usi ng modular and standard designs. This paper will discuss the diverse g roup of support systems, including specifications and performance data of the prototypes.