Problems and prospects for microsecond pulsed power above ten megamperes

Systems, such as Shiva Star, Atlas, and magnetic-flux compression generator s (MCGs), that can deliver several mega joules at currents above 10 MA offe r the opportunity for many interesting experiments in controlled fusion tec hnology and basic material dynamics. Typical current rise-times of a few mi croseconds result, even with low inductance (<20 nH) circuitry, because sev eral megajoules are delivered at less than 200 kV. This means that conducto r surfaces can move significantly relative to the skin-layer thickness, and surface plasmas can interfere with power flow. Success with such multimega mpere technology, therefore, requires considerable attention to the detaile d design of joints and conductor surfaces. This paper discusses these and o ther design considerations. It also describes opportunities enabled by oper ation above 10 MA.