Carter, J.A. Billett, B. Brajuskovic, B. Lale, M.A. McElderry, A. Noonan, J. R. O'Neill, M.M. Wakefield, K. Walters, D.R. Wiemerslage, G.E. Zientek, J. JACoW Publishing Geneva, Switzerland 978-3-95450-207-3 10.18429/JACoW-MEDSI2018-TUPH04 English 30-32 TUPH04 vacuum storage-ring photon interface electron Contribution to a conference proceedings 2018 2018-12 https://doi.org/10.18429/JACoW-MEDSI2018-TUPH04 http://jacow.org/medsi2018/papers/tuph04.pdf The final design phase is underway for the APS-Upgrade project's storage ring vacuum system. Many aspects of the design are being worked on to address challenging interfaces and to optimize vacuum system performance. Examples of recent work include updates to ray tracing and vacuum analysis, new developments in vacuum chamber and photon absorber design, and further refinement of vacuum pumping plans to achieve the best possible pressure distributions. Recent R&D work and results from a vacuum system sector mockup have also informed designs and installation plans. An overview of progress in these areas and remaining challenges is pre-sented.