Ferrite Kicker Magnet for the LAMPF Switchyard Upgrade

The new LAMPF switchyard requires a kicker magnet as the first element in the transport line leading to the Proton Storage Ring (PSR). The magnet must produce 1-ms-long pulses with 40-ps rise time and <0.3% flat-top regulation to deflect the 800-MeV H- beam by 1.2°. We have constructed two 1-m-long, single-turn ferrite magnets, each powered by a modulator supplying up to 2400 A at a maximum rate of 24 Hz. The modulators use a transistor amplifier/regulator, a dual pulse-forming-network (PFN), and a compensating circuit driven by a function generator to achieve a total 0.1% current variation in the pulse. The system also produces an alternate kicking mode consisting of 150-¿s-long pulses at a maximum rate of 120 Hz; the two modes can be multiplexed within the charging power-supply limitations.