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

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. Our 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. Our 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 notmore » 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.« less
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  1. Imperial College, London (United Kingdom). Blackett Lab.
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  3. Univ. of Alberta, Edmonton, AB (Canada). Dept. of Physics
  4. Inst. of Fluid Physics, Mianyang (China). Key Lab. of Pulsed Power
  5. Northwest Inst. of Nuclear Technology, Xian (China). Dept. of Pulsed Plasma Diagnostics
Publication Date:
Report Number(s):
Journal ID: ISSN 1070-664X
Grant/Contract Number:
AC52-07NA27344; F03-02NA00057; SC-0001063
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 23; Journal Issue: 5; Conference: Presented at: 57th APS Divsion of Plasma Physics, Savannah, GA, United States, Nov 16 - Nov 20, 2015; Journal ID: ISSN 1070-664X
American Institute of Physics (AIP)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Country of Publication:
United States
70 PLASMA PHYSICS AND FUSION; 42 ENGINEERING; magnetic fields; plasma temperature; scattering measurements; magnetic field measurements; plasma diagnostics
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1420671