Design and testing of a magnetically driven implosion peak current diagnostic

Hess, Mark Harry; Peterson, Kyle J.; Ampleford, David J.; Hutsel, Brian Thomas; Jennings, Christopher Ashley; Gomez, Matthew R.; Dolan, Daniel H.; Robertson, Grafton Kincannon; Payne, Sheri L.; Stygar, William A.; Martin, Matthew R.; Sinars, Daniel B.

doi:10.1063/1.5024374

Title: Design and testing of a magnetically driven implosion peak current diagnostic

Journal Article · 17 April 2018 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.5024374 · OSTI ID:1485837

Hess, Mark Harry ^[1];

^[1];

^[1]; Jennings, Christopher Ashley ^[1];

^[1];

^[1]; Robertson, Grafton Kincannon ^[1]; Payne, Sheri L. ^[2]; Stygar, William A. ^[1]; Martin, Matthew R. ^[1]; Sinars, Daniel B. ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
National Security Technologies, LLC, Albuquerque, NM (United States)

We report that a critical component of the magnetically driven implosion experiments at Sandia National Laboratories is the delivery of high-current, 10s of MA, from the Z pulsed power facility to a target. In order to assess the performance of the experiment, it is necessary to measure the current delivered to the target. Recent Magnetized Liner Inertial Fusion (MagLIF) experiments have included velocimetry diagnostics, such as PDV (Photonic Doppler Velocimetry) or Velocity Interferometer System for Any Reflector, in the final power feed section in order to infer the load current as a function of time. However, due to the nonlinear volumetrically distributed magnetic force within a velocimetry flyer, a complete time-dependent load current unfold is typically a time-intensive process and the uncertainties in the unfold can be difficult to assess. In this paper, we discuss how a PDV diagnostic can be simplified to obtain a peak current by sufficiently increasing the thickness of the flyer. This effectively keeps the magnetic force localized to the flyer surface, resulting in fast and highly accurate measurements of the peak load current. Additionally, we show the results of experimental peak load current measurements from the PDV diagnostic in recent MagLIF experiments.

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

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

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

OSTI ID:: 1485837

Report Number(s):: SAND--2018-3879J; 670111

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 4 Vol. 25; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Current transport and loss mechanisms in the Z accelerator Bennett, N.; Welch, D. R.; Jennings, C. A. Physical Review Accelerators and Beams, Vol. 22, Issue 12 https://doi.org/10.1103/physrevaccelbeams.22.120401	journal	December 2019

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