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TY - UNPB AU - Lindberg, R.R. ED - Yamazaki, Yoshishige ED - Raubenheimer, Tor ED - McCausey, Amy ED - Schaa, Volker RW TI - Physics of the MBA Lattice J2 - Proc. of NAPAC2019, Lansing, MI, USA, 01-06 September 2019 CY - Lansing, MI, USA T2 - North American Particle Accelerator Conference T3 - 4 LA - english AB - Multi-bend achromat (MBA) lattices were proposed more than 25 years ago as a way to reduce the emittance of third generation storage rings by 1-2 orders of magnitude, and thereby increase the x-ray brightness by a similar factor. However, it wasn’t until the recent advances in compact magnets and vacuum pumping, pioneered by MAX-IV and CERN, respectively, that MBA lattices could be considered as the basis for a light source. Now, there are many projects around the world that employ an MBA lattice to achieve an emittance well below 1 nm. I will begin by briefly reviewing how the MBA lattice can achieve an ultra-low emittance. Then, I will proceed to discuss how the essential physics of the MBA drives its design, and how that in turn impacts the physics. For example, its requirement for strong magnets leads to a small dynamic aperture and physically small vacuum chambers, which in turn impacts impedance and collective effects. I will try to illustrate this interplay with advances made by many other projects, but will inevitably favor the recent progress of the APS-Upgrade project, where we are targeting a 42-pm design for hard x-rays. PB - JACoW Publishing CP - Geneva, Switzerland ER -