| AVS 66th International Symposium & Exhibition | |
| Vacuum Technology Division | Tuesday Sessions |
| Session VT-TuM |
| Session: | Accelerators and Large Vacuum Systems |
| Presenter: | Jason Lerch, Argonne National Laboratory |
| Authors: | J.E. Lerch, Argonne National Laboratory M.E. Szubert, Argonne National Laboratory E. Anliker, Argonne National Laboratory T. Bender, Argonne National Laboratory |
| Correspondent: | Click to Email |
There are 35 straight sections in the APS-U, requiring 30 planar vacuum chambers (IDVC) and 5 superconducting vacuum systems (SCU VC). These vacuum systems provide Ultra-High Vacuum (UHV) continuity between storage ring (SR) sectors. The IDVC, nominally 5.363 meters long, requires bake-out before operation and expands 10mm on both ends. The SCU vacuum chambers, nominally 5.383 meters long, are cooled cryogenically and contract 14 mm on both ends. The APS-U straight sections are identical around the SR but require bellows on both ends to accommodate the change in length of both systems. The aluminum planar vacuum chamber operates in UHV with a 600 thick wall over a length of 5050 mm and requires the use of 1 ion pump and 7 NEG cartridges for pumping down the system. The SCU is comprised of two copper “warm” vacuum systems, operating at room temperature outside the cryostat, and one aluminum “cold” vacuum system (4.8m long), operating at 20K inside the cryostat. The “warm” chambers have a minimum wall thickness of 1 mm and operate as photon absorbers at either end of the system, one protecting the cryogenically pumped chamber and one protecting downstream equipment. The “cold” chamber has a minimum wall thickness of 400 and operates at UHV at 20 Kelvin. The internal geometries of these various systems are optimized to reduce dissipated heat on the chamber walls where possible and allow for seamless transitions for various apertures. Both vacuum systems require the ability to align the apertures ±50 microns along their lengths.