Schmidt, O.A. Benda, E. Capatina, D. Clute, T.K. Collins, J.T. Erdmann, M. Graber, T. Haeffner, D. Jaski, Y. Knopp, J.J. Navrotski, G. Winarski, R. JACoW Publishing Geneva, Switzerland 978-3-95450-207-3 10.18429/JACoW-MEDSI2018-THOPMA02 English 324-326 THOPMA02 photon storage-ring optics vacuum brightness Contribution to a conference proceedings 2018 2018-12 https://doi.org/10.18429/JACoW-MEDSI2018-THOPMA02 http://jacow.org/medsi2018/papers/thopma02.pdf The Advanced Photon Source (APS) is currently in the process of upgrading to a 4th generation high-energy light source. A new multi-bend achromat storage ring will provide increased brightness and an orders-of-magnitude improvement in coherent flux over the current facility. To take advantage of these new capabilities, we will be building nine new feature beamlines and implementing numerous additional beamline enhancements, all while ensuring the compatibility of existing programs. Clear challenges exist in advancing state-of-the-art optics and developing nano-resolution instrumentation. We also need to recognize and address project scheduling, labor resources, existing infrastructure, bending magnet param-eters, and possible modifications to radiation shielding in order to achieve project success.