Micropinch formation dynamics in X pinches

Elshafiey, A. T.; Chalmers, N. G.; Hammer, D. A.

doi:10.1103/physreve.110.l033202

Title: Micropinch formation dynamics in X pinches

Journal Article · 26 September 2024 · Physical Review. E

DOI: https://doi.org/10.1103/physreve.110.l033202 · OSTI ID:2448318

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Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Cornell Univ., Ithaca, NY (United States)
Cornell Univ., Ithaca, NY (United States)

High temporal resolution x-ray streak camera studies of micropinch formation in Cu hybrid x pinches reveal key plasma conditions. Analysis of Ne-like Cu lines indicate an average electron temperature of about 200 eV and 4.5×10²⁸m^-3 electron density. Here, the spectra suggest that the electron temperature jumps to about 1 keV, inferred from the continuum and the postcontinuum line emission that includes Li-like Cu lines. There is no sign of a rapid temperature change or a substantial surge in radiation emission during the 200 ps precontinuum x-ray burst, suggesting that the radiative collapse process does not play a major role in micropinch formation. Two-dimensional extended Magnetohydrodynamic (MHD) simulations, coupled to a collisional-radiative spectral analysis code, suggest the significance of the rapid radial implosion of high-temperature, low-density plasma, the axial outflow, and the dynamic plasma pressure in micropinch formation.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: 89233218CNA000001; NA0003764; NA0004027; SC0018088

OSTI ID:: 2448318

Report Number(s):: LA-UR--24-20891

Journal Information:: Physical Review. E, Journal Name: Physical Review. E Journal Issue: 3 Vol. 110; ISSN 2470-0045

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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