Double and Single Planar Wire Arrays on University-Scale Low-Impedance LTD Generator

PROJECT TITLE :

Double and Single Planar Wire Arrays on University-Scale Low-Impedance LTD Generator

ABSTRACT:

Planar wire array (PWA) experiments were performed on Michigan Accelerator for Inductive Z-pinch Experiments, the University of Michigan’s low-impedance linear transformer driver (LTD)-driven generator (zero.1 Ω, 0.5-1 MA, and one hundred-200 ns), for the first time. It absolutely was demonstrated that Al wire arrays [each double PWA (DPWA) and single PWA (SPWA)] can be successfully imploded at LTD generator even at the relatively low current of zero.3-zero.5 MA. In specific, implosion characteristics and radiative properties of PWAs of different load configurations [for DPWA from Al and chrome steel wires with completely different wire diameters, interwire gaps, and interplanar gaps (IPGs) and for Al SPWA of various array widths and variety of wires] were studied. The key difference from the DPWA experiments on high-impedance Zebra accelerator was in the current rise time that was influenced by the load inductance and was increased up to regarding one hundred fifty ns during the first campaign (and was even longer in the second campaign). The implosion dynamics of DPWAs strongly depends on the crucial load parameter, the aspect ratio (the ratio of the array width to IPG) as for Al DPWAs on high-impedance Zebra, however some variations were observed, for low-aspect ratio hundreds in particular. Analysis of X-ray images and spectroscopy indicates that K-shell Al plasmas from Al PWAs reached the electron temperatures up to more than 450 eV and densities up to two × 1020 cm-3. Despite the low mass of the hundreds, opacity effects were observed in the most outstanding K-shell Al lines virtually in each shot.

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