LATTICE STUDIES FOR A POTENTIAL SOFT X-RAY DIFFRACTION LIMITED UPGRADE OF THE ALS

The Advanced Light Source (ALS) at Berkeley Lab has seen many upgrades over the years, keeping it one of the brightest sources for soft x-rays worldwide. Recent developments in magnet and vacuum technology, as well as lattice design (multi bend achromat lattices) appear to open the door for very large further increases in brightness [1]. This could be achieved by reducing the horizontal emittance, with the new ring remaining within the space constraints of the existing tunnel. Initial studies yielded candidate lattices which approach the soft x-ray diffraction limit in both planes within the ALS footprint (diffraction limit around 2 keV, compare projected brightness in Fig. 1).