Direct comparison of wire, foil, and hybrid X-pinches on a 200 kA, 150 ns current driver

Collins, G. W.; Valdivia, M. P.; Hansen, S. B.; Conti, F.; Carlson, L. C.; Hammer, D. A.; Elshafiey, A.; Narkis, J.; Beg, F. N.

doi:10.1063/5.0035587

Title: Direct comparison of wire, foil, and hybrid X-pinches on a 200 kA, 150 ns current driver

Journal Article · Sun Feb 21 00:00:00 EST 2021 · Journal of Applied Physics

DOI:https://doi.org/10.1063/5.0035587· OSTI ID:1772030

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Univ. of California, San Diego, CA (United States)
Johns Hopkins Univ., Baltimore, MD (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
General Atomics, La Jolla, California 92121, USA
Cornell Univ., Ithaca, NY (United States)

Wire X-pinches (WXPs) have been studied comprehensively as fast (~1 ns pulse width), small (~1 μm) x-ray sources, created by twisting two or more fine wires into an “X” to produce a localized region of extreme magnetic pressure at the cross-point. Recently, two alternatives to the traditional WXP have arisen: the hybrid X-pinch (HXP), composed of two conical electrodes bridged by a thin wire or capillary, and the laser-cut foil X-pinch (LCXP), cut from a thin foil using a laser. Here, we present a comparison of copper wire, hybrid, and laser-cut foil X-pinches on a single experimental platform: UC San Diego’s ~200 kA, 150 ns rise time GenASIS driver. All configurations produced 1–2 ns pulse width, ≤5 μm soft x-ray (Cu L-shell, ~1 keV) sources (resolutions diagnostically limited) with comparable fluxes. WXP results varied with linear mass and wire count, but consistently showed separate pinch and electron-beam-driven sources. LCXPs produced the brightest (~1 MW), smallest (≤5 μm) Cu K-shell sources, and spectroscopic data showed both H-like Cu K_α lines indicative of source temperatures ≥2 keV, and cold K_α (~8050 eV) characteristic of electron beam generated sources, which were not separately resolved on other diagnostics (within 1–2 ns and ≤200 μm). HXPs produced minimal K-shell emission and reliably single, bright, and small L-shell sources after modifications to shape the early current pulse through them. Benefits and drawbacks for each configuration are discussed to provide potential X-pinch users with the information required to choose the configuration best suited to their needs.

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Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of California, San Diego, CA (United States); Johns Hopkins Univ., Baltimore, MD (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; NA0003842; NA0003882; NA0003525; NA0004028

OSTI ID:: 1772030

Alternate ID(s):: OSTI ID: 1766332; OSTI ID: 1784740; OSTI ID: 1837684; OSTI ID: 1887290

Report Number(s):: SAND-2021-2848J; 694673

Journal Information:: Journal of Applied Physics, Vol. 129, Issue 7; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Direct comparison of wire, foil, and hybrid X-pinches on a 200 kA, 150 ns current driver

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