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The availability of high current, (several thousand amperes) silicon controlled rectifiers and high current, low loss capacitors make it practical to design a direct coupled energy discharge power supply for the neutrino horns in the proposed NuMI facility at Fermilab. The neutrino horns require a continuous pulse train of 200,000 A and 1 msec duration at a pulse period of 1.5 seconds. This high current pulse train yields a system load current of about 9,000 A rms. Using a high power coupling transformer between the energy stored in a capacitor bank and the horns is very expensive because the transformer secondary winding would have to be rated for 9,000 A rms at about 1,400 Vpk. The transformer would also add leakage inductance to the discharge circuit, take up a substantial amount of floor space and make stored energy recovery from the horns less effective or maybe even impractical. The transformer would need a reset winding to remove the high remnant magnet field in the transformer steel which is caused by the unipolar discharge pulses. A coupling transformer is practical for high voltage loads, but the horns operate at a relatively low voltage of about 1,400 V, which makes direct coupling very attractive. This note describes a preliminary design for a direct coupled system. From the design notes the authors can conclude that direct coupling is economical, practical, relatively simple, can use energy recovery and does not require materials or equipment that is hard to obtain. The charging power supply could be two standard (Fermilab) 240 kW beamline power supplies connected in series and grounded at the midpoint. The capacitor bank, switches, transmission line and controls can be most economically assembled in house. They may conclude that it is desirable to build a direct coupled neutrino horn power supply system and to connect both horns in series

Preliminary design note for a direct coupled 200,000 amp neutrino horn power supply with energy recovery