Pulsed multipole injection for ALS upgrade

The pulsed multipole injection scheme is shown to be compatible with the ALS in combination with a magnet lattice that has a low β-function in the injection straight. Since traditional injection schemes are not compatible with such optimized low-β lattices, implementing the new injection scheme opens up several new possibilities. For instance, the adoption of a low-β lattice can greatly increase brightness due to the better matching of photon and electron beam emittances. This document explains the principles of the injection and the calculations we performed to show that the concept is sound. An analysis is carried out to optimize the location and strength of the injection kicker, the required acceptance of the storage ring and the matched Twiss parameters of the transfer line.