Making HPM practical

Summary form only given, as follows. The transition from HPM source research to useful HPM systems is constrained by requirements for (1) continuous or burst operation at high repetition rates, (2) reduction of overall system size, weight and electrical power consumption, (3) extensive tunability or frequency agility and (4) long life robust maintainable hardware. Each of these constraints drive certain critical technology elements. Progress in these areas has occurred at PI in the development of outdoor test systems and advanced technology demonstrations. As an example, tunable relativistic magnetrons now provide continuously variable frequency and high repetition rates in increasingly compact packages. Future HPM device progress and performance goals are discussed.