A Simple Real-time Beam Tuning Program for the Kekb Injector Linac

A simple real-time beam tuning program has been developed for use at the KEK B-Factory injector linac. The program features the ability to adjust an arbitrary combination of parameters (e.g. magnet currents and RF phases) in order to optimize an arbitrary combination of monitor values (e.g. the ratio of a downstream beam current to gun current). Based on the downhill-simplex method[2][?], it requires no knowledge of beamline details. An additional ”persistence” parameter is used to adjust the treatment of pulse-to-pulse variations of monitor values while mapping the parameter-space terrain, and controls the peak-holding performance in the presence of both statistical fluctuations and long-term drift. Preliminary results from the commissioning of the KEKB injector linac and plans for the future are discussed.