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The upgrade of the Advanced Photon Source (APS) to a Multi-Bend Achromat (MBA) will increase the brightness of the APS by between two and three orders of magnitude. The APS upgrade (APS-U) project includes a list of feature beamlines that will take full advantage of the new machine. Many of the existing beamlines will be also upgraded to profit from this significant machine enhancement. Optics simulations are essential in the design and optimization of these new and existing beamlines. In this contribution, the simulation tools used and developed at APS, ranging from analytical to numerical methods, are summarized. Three general optical layouts are compared in terms of their coherence control and focusing capabilities. The concept of zoom optics, where two sets of focusing elements (e.g., CRLs and KB mirrors) are used to provide variable beam sizes at a fixed focal plane, is optimized analytically. The effects of figure errors on the vertical spot size and on the local coherence along the vertical direction of the optimized design are investigated.

The Fourth Diffraction Limited Storage Ring (DLSR) Workshop was held at Argonne National Laboratory's Advanced Photon Source from November 19 to 21, 2014. The three-day meeting was attended by 120 participants from 22 different institutions. Local organizers of the workshop were Lahsen Assoufid, Herman Cease, Glenn Decker, Kathy Harkay, Dean Haeffner, Dennis Mills, Connie Vanni, and Diane Wilkinson (all Advanced Photon Source). The workshop website is http://dlsr-workshop-2014.aps.anl.gov/.