Experimental investigations of ablation stream interaction dynamics in tungsten wire arrays: Interpenetration, magnetic field advection, and ion deflection

Swadling, G. F.; Lebedev, S. V.; Hall, G. N.; Suzuki-Vidal, F.; Burdiak, G. C.; Pickworth, L.; De Grouchy, P.; Skidmore, J.; Khoory, E.; Suttle, L.; Bennett, M.; Hare, J. D.; Clayson, T.; Bland, S. N.; Smith, R. A.; Stuart, N. H.; Patankar, S.; Robinson, T. S.; Harvey-Thompson, A. J.; Rozmus, W.; Yuan, J.; Sheng, L.

doi:10.1063/1.4948279

Title: Experimental investigations of ablation stream interaction dynamics in tungsten wire arrays: Interpenetration, magnetic field advection, and ion deflection

Journal Article · Sun May 01 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4948279· OSTI ID:1258529

^[1]; Lebedev, S. V. ^[1]; Hall, G. N. ^[1];

^[1]; Burdiak, G. C. ^[1]; Pickworth, L. ^[1]; De Grouchy, P. ^[1]; Skidmore, J. ^[1]; Khoory, E. ^[1]; Suttle, L. ^[1]; Bennett, M. ^[1]; Hare, J. D. ^[1]; Clayson, T. ^[1]; Bland, S. N. ^[1]; Smith, R. A. ^[1];

^[1]; Patankar, S. ^[1]; Robinson, T. S. ^[1]; Harvey-Thompson, A. J. ^[2]; Rozmus, W. ^[3] more »

Imperial College, London (United Kingdom). Blackett Lab.
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Univ. of Alberta, Edmonton, AB (Canada). Dept. of Physics
Inst. of Fluid Physics, Mianyang (China). Key Lab. of Pulsed Power
Northwest Inst. of Nuclear Technology, Xian (China). Dept. of Pulsed Plasma Diagnostics

Experiments have been carried out to investigate the collisional dynamics of ablation streams produced by cylindrical wire array z-pinches. A combination of laser interferometric imaging, Thomson scattering, and Faraday rotation imaging has been used to make a range of measurements of the temporal evolution of various plasma and flow parameters. This paper presents a summary of previously published data, drawing together a range of different measurements in order to give an overview of the key results. The paper focuses mainly on the results of experiments with tungsten wire arrays. Early interferometric imaging measurements are reviewed, then more recent Thomson scattering measurements are discussed; these measurements provided the first direct evidence of ablation stream interpenetration in a wire array experiment. Combining the data from these experiments gives a view of the temporal evolution of the tungsten stream collisional dynamics. In the final part of the paper, we present new experimental measurements made using an imaging Faraday rotation diagnostic. These experiments investigated the structure of magnetic fields near the array axis directly; the presence of a magnetic field has previously been inferred based on Thomson scattering measurements of ion deflection near the array axis. Although the Thomson and Faraday measurements are not in full quantitative agreement, the Faraday data do qualitatively supports the conjecture that the observed deflections are induced by a static toroidal magnetic field, which has been advected to the array axis by the ablation streams. It is likely that detailed modeling will be needed in order to fully understand the dynamics observed in the experiment.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AC52-07NA27344; F03-02NA00057; SC-0001063

OSTI ID:: 1258529

Alternate ID(s):: OSTI ID: 1420671

Report Number(s):: LLNL-CONF-679929

Journal Information:: Physics of Plasmas, Vol. 23, Issue 5; Conference: Presented at: 57th APS Divsion of Plasma Physics, Savannah, GA, United States, Nov 16 - Nov 20, 2015; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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References (22)

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Time-resolved and multiple-angle Thomson scattering on gas-puff Z-Pinch plasmas at pinch time Rocco, Sophia V. R.; Banasek, Jacob T.; Potter, William M. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5038879	journal	October 2018

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