(D). A movable tap on the inductor allowed for impedance matching with the amplifier. The output voltage was measured using a capacitive divider (E). There were two voltage sources used for the present experiments. The first voltage source was located at Arizona State University (ASU) and was used for the short gap experiments. The second source was located at the U.S. Navy's Edgar Beauchamp High Voltage Testing Facility (EBHVTF) and was used for the long gap experiments. The ASU source had a voltage limit of 18 kVrms while the EBHVTF source had a limit of 300 kVrms.