Development of a high quality kicker magnet system

As part of the Fermilab Tevatron upgrade, a 6.25 Ω ferrite loaded traveling wave kicker magnet has been designed. The critical parameters are the field rise time and flatness during and after the pulse. A picture frame pole piece configuration was chosen which requires two pulses of equal amplitude but opposite polarity. Low inductance, high voltage capacitors placed between each of the pole pieces provide the shunt reactance necessary to achieve the 6.25 Ω impedance. Cross coupling adjacent cells is used to improve the transient response of the magnet. The compensated termination resistors are built into the magnet to minimize reflections. Two spark gap pulsers provide the two 4800 A fast rise time current pulses necessary to drive this magnet. The field in this 2.4 m long magnet rises to 1055 G in less than 400 ns. This paper describes the design choices involved with this system and preliminary test results