Parameters which influence the performance of practical magnetic switches

In a number of pulsed power applications requiring operation at high repetition rates and high average power levels, magnetic pulse compression networks may be considered as alternatives to high pressure gas discharge switches. Magnetic pulse compression networks are typically passive circuits which take advantage of the nonlinear characteristics of inductors wound upon cores consisting of ferro- or ferri-magnetic material to effect large changes in the impedances of the circuit. As a result, these nonlinear inductors, often referred to as magnetic switches, can effectively mirror the operation of high power switching devices. Since magnetic switches are passive devices, they do not suffer from many of the limitations associated with discharge switching devices. The performance of a magnetic pulse compression network is, to a large extent, determined by that of each individual magnetic switch. In order to maximize the efficiency of the compression network, it is necessary to recognize the physical parameters which can significantly influence the electrical performance of a practical magnetic switch. In this paper, the performance criteria of a magnetic switch functioning in a Melville-type line is defined, i.e., in general, "what makes a good magnetic switch." In addition, relationships are derived between the physical layout of a magnetic switch and its overall electrical performance. In particular, the relationship between geometry of the magnetic switch core and that of the electrical current paths which surround the core are discussed.