Experiments on MA linear transformer drivers

Abstract

Linear Transformer Drivers (LTDs) represent the most compact, high-current accelerators. LTDs have numerous advantages over Marx PFL systems: a) fast risetime (100 ns) without additional pulse forming, b) high efficiency (∼70%), c) inductive voltage adder and d) repetitively pulsed operation. LTDs have been utilized in a patented Sandia design for a PW pulsed power driver for fusion.[1] MYKONOS, a 1-MV, 1-MA LTD system is being constructed at Sandia. The 1-MA, 100 kV LTD at UM was designed and developed at the IHCE under Sandia sponsorship. Initial tests were performed at IHCE in an inductive-adder with 5 LTD modules at 1-MA and 0.5 MV. At UM, the LTD was coupled to a Magnetically Insulated Transmission Line (MITL) to drive a load in the MAIZE z-pinch facility. Resistive load tests agreed well with PSPICE simulations. Modifications have been made to the UM LTD to improve its serviceability in an experimental system. Magneto-Rayleigh-Taylor plasma instability experiments have been performed on the UM LTD facility in a low-inductance, planar-foil plasma load, located between two planar anode plates.[2] Laser shadowgraphy was performed by a 100-sps doubled-YAG laser. Instability growth rate have been compared to MRT theory (Lau et al., this conference). PSPICE simulations of LTD component voltages and currents have been performed, accounting for calculated foil motion. UM LTD convolute experiments were performed.[3]