Abstract
The ALS-U project consists in the upgrade of the existing Advanced Light Source at LBNL to a new ultra-low emittance lattice for production of diffraction-limited soft x-rays. In order to compensate for the reduced beam lifetime we intend to operate the machine in continuous topoff mode, where one of several bunch trains is extracted every 30-60 seconds and swapped with a fresh train from the accumulator ring, which is injected on axis without perturbing the circulating beam. In this paper we present our design for the injection/extraction kicker based on matched stripline electrodes. Such kicker has to provide the necessary deflection for simultaneously extracting a bunch train and injecting on-axis a fresh one from the accumulator ring. Rise and fall times must fit in the gap between bunch trains so that the injection/extraction process does not affect the remaining bunches. The main parameters of such a kicker are discussed with particular emphasis on the minimum gap length between trains, which also affects other machine subsystems.
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