Design of an AC magnetic biasing circuit for the KAON factory booster RF cavity

The resonant frequency of an rf cavity to be used in the booster ring of the TRIUMF KAON factory, is determined by the state of magnetization of a set of 6 rings of G810 aluminium doped yttrium-iron garnet ferrite. The design of an ac magnet which performs the required magnetization is presented. The results of the ac magnet code PE2D to predict eddy current induced power losses walls of the rf circuit, support structure and the G810 cooling jacket are presented.