Discrete helical modes in imploding and exploding cylindrical, magnetized liners

Yager-Elorriaga, D. A.; Zhang, P.; Steiner, A. M.; Jordan, N. M.; Campbell, P. C.; Lau, Y. Y.; Gilgenbach, R. M.

doi:10.1063/1.4969082

Title: Discrete helical modes in imploding and exploding cylindrical, magnetized liners

Journal Article · Tue Dec 06 00:00:00 EST 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4969082· OSTI ID:1465361

Yager-Elorriaga, D. A. ^[1]; Zhang, P. ^[1];

^[1];

^[1]; Campbell, P. C. ^[1]; Lau, Y. Y. ^[1];

^[1]

Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Nuclear Engineering and Radiological Sciences

Discrete helical modes have been experimentally observed from implosion to explosion in cylindrical, axially magnetized ultrathin foils (B_z = 0.2 - 2.0 T) using visible self-emission and laser shadowgraphy. The striation angle of the helices, phi, was found to increase during the implosion and decrease during the explosion, despite the large azimuthal magnetic field (>40 T). Here, these helical striations are interpreted as discrete, non-axisymmetric eigenmodes that persist from implosion to explosion, obeying the simple relation $$\phi$$ = m/kR, where m, k, and R are the azimuthal mode number, axial wavenumber, and radius, respectively. Experimentally, we found that (a) there is only one, or at the most two, dominant unstable eigenmode, (b) there does not appear to be a sharp threshold on the axial magnetic field for the emergence of the non-axisymmetric helical modes, and (c) higher axial magnetic fields yield higher azimuthal modes.

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Research Organization:: Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Nuclear Engineering and Radiological Sciences

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR)

Grant/Contract Number:: SC0012328; DGE 1256260; FA9550-15-1-0419

OSTI ID:: 1465361

Alternate ID(s):: OSTI ID: 1334553

Journal Information:: Physics of Plasmas, Vol. 23, Issue 12; 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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The electro-thermal stability of tantalum relative to aluminum and titanium in cylindrical liner ablation experiments at 550 kA Steiner, Adam M.; Campbell, Paul C.; Yager-Elorriaga, David A. Physics of Plasmas, Vol. 25, Issue 3 https://doi.org/10.1063/1.5012891	journal	March 2018
Evolution of sausage and helical modes in magnetized thin-foil cylindrical liners driven by a Z-pinch Yager-Elorriaga, D. A.; Lau, Y. Y.; Zhang, P. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5017849	journal	May 2018
Researches on preconditioned wire array Z pinches in Xi’an Jiaotong University Wu, Jian; Lu, Yihan; Sun, Fengju Matter and Radiation at Extremes, Vol. 4, Issue 3 https://doi.org/10.1063/1.5087265	journal	May 2019
The influence of the solid to plasma phase transition on the generation of plasma instabilities Kaselouris, E.; Dimitriou, V.; Fitilis, I. Nature Communications, Vol. 8, Issue 1 https://doi.org/10.1038/s41467-017-02000-6	journal	November 2017

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