Effects of an axial magnetic field on the current distribution in a Z-pinch implosion with preembedded magnetic field

Mikitchuk, D.; Cvejic, M.; Doron, R.; Kroupp, E.; Stollberg, C.; Maron, Y.; Velikovich, A. L.; Ouart, D.; Giuliani, J.L.; Mehlhorn, T. A.; Yu, E. P.; Fruchtman, A.

doi:10.1103/PhysRevLett.122.045001

Title: Effects of an axial magnetic field on the current distribution in a Z-pinch implosion with preembedded magnetic field

Journal Article · Tue Aug 07 00:00:00 EDT 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.122.045001· OSTI ID:1466736

Mikitchuk, D. ^[1]; Cvejic, M. ^[1]; Doron, R. ^[1]; Kroupp, E. ^[1]; Stollberg, C. ^[1]; Maron, Y. ^[1]; Velikovich, A. L. ^[2]; Ouart, D. ^[2]; Giuliani, J.L. ^[2]; Mehlhorn, T. A. ^[2]; Yu, E. P. ^[3]; Fruchtman, A. ^[4]

Weizmann Inst. of Science, Rehovot (Israel)
Naval Research Lab. (NRL), Washington, DC (United States). Plasma Physics Division
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Holon Institute of Technology (Israel)

In this study, the fundamental physics of the magnetic field distribution in a plasma implosion with a pre-embedded magnetic field is investigated within a gas puff Z-pinch. Time and space resolved spectroscopy of the polarized Zeeman effect, applied for the first time, reveals the impact of a pre-embedded axial field on the evolution of the current distribution driven by a pulsed-power generator. The measurements show that the azimuthal magnetic field in the imploding plasma, even in the presence of a weak axial magnetic field, is substantially smaller than expected from the ratio of the driving current to the plasma radius. Much of the current flows at large radii through a slowly-imploding, low-density plasma. The development of a force-free current configuration is suggested to explain this phenomenon. Finally, previously unpredicted observations in higher-power imploding-magnetized-plasma experiments, including recent unexplained structures observed in the Magnetized Liner Inertial Fusion experiment, may be explained by the present discovery.

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Research Organization:: Cornell Univ., Ithaca, NY (United States)

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

Grant/Contract Number:: NA0003764

OSTI ID:: 1466736

Journal Information:: Physical Review Letters, Vol. 122; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 14 works

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