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Summary form only given. Electrical contact is an important issue for high power microwave sources, wire-array Z pinches, field emitters, and metal-insulator-vacuum junctions. Because of the surface roughness on a microscopic scale, true contact between two pieces of metal occurs only on the asperities of the two contacting surfaces. Current flows only through these asperities, which occupy a small...
Summary form only given. Post-hole convolutes are commonly used in large scale pulsed power devices to combine the current from several sources. The primary examples of convolute use are Load Current Multipliers (LCMs) and current combination from multiple Self-Magnetically Insulated Transmission Lines (MITLs). Sandia National Laboratory's Z-Machine utilizes a double post-hole convolute to combine...
We present designs, resistive-load test results and experimental plans of the first 1 MA z-pinch in the USA to be driven by a Linear Transformer Driver (LTD). The Michigan Accelerator for Inductive Z-pinch Experiments, (MAIZE), is based on the LTD developed at the Institute for High Current Electronics in collaboration with Sandia National Labs. This LTD utilizes 80 capacitors and 40 spark gap switches...
The contact resistance in a wire array z-pinch has a significant affect on both the level and uniformity of energy deposition in the wires. Typically wires are held taut against the electrodes by wire weights (-1-10 g depending on wire material and diameter). This can lead to contact resistance values of -90-99% of the load resistance. Previous techniques to reduce the contact resistance (i.e. soldering)...
Summary form only given. We have recently developed an analytic theory on the linear and nonlinear evolution of the most unstable azimuthal clumping mode (the pi mode, in which neighboring wires pair up) in a discrete wire array. This azimuthal instability is violent and dominates over the radial motion of the wire array, both in the linear and nonlinear regimes. Thus, the lack of wire-pairing provides...
Summary form only given. A self-magnetically insulated transmission line (MITL) has been designed to transmit a 1 MA 100 kV pulse with a 70 ns rise-time from a Linear Transformer Driver (LTD) to a wire array z-pinch load. The transmission line has three stages: a coaxial line, followed by a radial line, and finally a conical line to the load. The transmission line geometry was chosen to ease construction...
Summary form only given. Investigations of the effect of initial wire contact-resistance on wire ablation dynamics are being conducted. Experiments utilize a 120 kV, 20 kA pulser with 140 ns rise-time, which drives a two-wire z-pinch load. Diagnostics for the experiment include laser shadowgraphv, streak camera images, and time-gated ICCD visible-UV wavelength spectroscopy. Both aluminum and stainless...
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