Direct comparison of wire, foil, and hybrid X-pinches on a 200 kA, 150 ns current driver
2022
unknown
Zugriff:
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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Direct comparison of wire, foil, and hybrid X-pinches on a 200 kA, 150 ns current driver
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Autor/in / Beteiligte Person: | Collins, G. W. ; Valdivia, M. P. ; Hansen, S. B. ; Conti, F. ; Carlson, L. C. ; Hammer, D. A. ; Elshafiey, A. ; Narkis, J. ; Beg, F. N. |
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Veröffentlichung: | 2022 |
Medientyp: | unknown |
DOI: | 10.1063/5.0035587 |
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