Examination of X-pinch dynamics using a low current (25kA) and slower rising (400ns) pulse

Le résumé fourni par la source

Summary form only given. We present results examining the dynamics of low current (25kA), long rise-time (400 ns) X-pinches. These are the lowest parameters yet used for X-pinch experiments. The X-pinches comprised either 2 or 4 wires of 5μm tungsten. We analyze coronal and axial plasma dynamics, cross-point evolution, X-ray emission, and post-pinching dissipation of the structure. Data shows that the pinch dynamics produced here is akin to those in X-pinches driven by 0.1-1 MA and at rise-rates from 0.25-10kA/ns. Silicon PIN diodes detected X-rays (~1-2keV range) emitted from the cross point in both the two-wire and four-wire configurations near peak current. These results suggest that compact pulsed power drivers consisting of 2-4 small capacitors in a simple capacitive discharge circuit can produce good quality pinches for a variety of possible applications including point-projection radiography, Thompson X-ray scattering, and laboratory astrophysical modeling. Additionally, we will present a model for determining the emission time of harder x-rays due to the onset of anomalous resistivity.

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