Evolution of sausage and helical modes in magnetized thin-foil cylindrical liners driven by a Z-pinch

Yager-Elorriaga, David Alexander; Lau, Y. Y.; Zhang, Peng; Campbell, Paul C.; Steiner, Adam M.; Jordan, Nicholas M.; McBride, Ryan D.; Gilgenbach, Ronald M.

doi:10.1063/1.5017849

Title: Evolution of sausage and helical modes in magnetized thin-foil cylindrical liners driven by a Z-pinch

Journal Article · Mon Mar 26 00:00:00 EDT 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5017849· OSTI ID:1485836

Yager-Elorriaga, David Alexander ^[1]; Lau, Y. Y. ^[2];

^[2]; Campbell, Paul C. ^[2];

^[2];

^[2]; McBride, Ryan D. ^[2];

^[2]

Univ. of Michigan, Ann Arbor, MI (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Univ. of Michigan, Ann Arbor, MI (United States)

Here, we present experimental results on axially magnetized (B_z = 0.5 – 2.0 T), thin-foil (400 nm-thick) cylindrical liner-plasmas driven with ~600 kA by the Michigan Accelerator for Inductive Z-Pinch Experiments, which is a linear transformer driver at the University of Michigan. We show that: (1) the applied axial magnetic field, irrespective of its direction (e.g., parallel or anti-parallel to the flow of current), reduces the instability amplitude for pure magnetohydrodynamic (MHD) modes [defined as modes devoid of the acceleration-driven magneto-Rayleigh-Taylor (MRT) instability]; (2) axially magnetized, imploding liners (where MHD modes couple to MRT) generate m = 1 or m = 2 helical modes that persist from the implosion to the subsequent explosion stage; (3) the merging of instability structures is a mechanism that enables the appearance of an exponential instability growth rate for a longer than expected time-period; and (4) an inverse cascade in both the axial and azimuthal wavenumbers, k and m, may be responsible for the final m = 2 helical structure observed in our experiments. Laslty, these experiments are particularly relevant to the magnetized liner inertial fusion program pursued at Sandia National Laboratories, where helical instabilities have been observed.

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Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

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

Grant/Contract Number:: AC04-94AL85000; SC0012328; NA0003525

OSTI ID:: 1485836

Alternate ID(s):: OSTI ID: 1429580

Report Number(s):: SAND-2018-11188J; 669582

Journal Information:: Physics of Plasmas, Vol. 25, Issue 5; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 27 works

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