Measurement of the current and symmetry of the impact liner on the NTLX experiments

Summary form only given, as follows. Recent experiments were conducted on the Shiva Star capacitor bank at the AFRL. These Near Term Liner Experiments (NTLX) magnetically imploded an aluminum liner onto a central target. Measurements of the driving currents in these experiments are required for the initial conditions needed in modeling calculations of the experiments conducted in the target cylinders. A Faraday rotation measurement was fielded on Shiva Star to measure the current and compare with the current measured by a Rogowski coil technique. The Faraday rotation technique easily measured the 16 MA currents in these experiments. In addition, six B-dot probes were fielded at equal angles around a circle in the powerflow channel to measure the symmetry of the liner impact on the target cylinder. The B-dot probes measured the I-dot of the system, which has a jump when the liner impacts the target cylinder. A high-pass filter allows one to measure this jump more accurately and from the timing of this jump the symmetry of the impact was measured.