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Title: X-ray imaging and 3D reconstruction of in-flight exploding foil initiator flyers

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.4953681· OSTI ID:1262177
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  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. National Security Technologies, LLC, Las Vegas, NV (United States)

Exploding foil initiators (EFIs), also known as slapper initiators or detonators, offer clear safety and timing advantages over other means of initiating detonation in high explosives. The work described here outlines a new capability for imaging and reconstructing three-dimensional images of operating EFIs. Flyer size and intended velocity were chosen based on parameters of the imaging system. The EFI metal plasma and plastic flyer traveling at 2.5 km/s were imaged with short ~80 ps pulses spaced 153.4 ns apart. A four-camera system acquired 4 images from successive x-ray pulses from each shot. The first frame was prior to bridge burst, the 2nd images the flyer about 0.16 mm above the surface but edges of the foil and/or flyer are still attached to the substrate. The 3rd frame captures the flyer in flight, while the 4th shows a completely detached flyer in a position that is typically beyond where slappers strike initiating explosives. Multiple acquisitions at different incident angles and advanced computed tomography reconstruction algorithms were used to produce a 3-dimensional image of the flyer at 0.16 and 0.53 mm above the surface. Both the x-ray images and the 3D reconstruction show a strong anisotropy in the shape of the flyer and underlying foil parallel vs. perpendicular to the initiating current and electrical contacts. These results provide detailed flyer morphology during the operation of the EFI.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344; LDRD-14-ERD-018; AC02-06CH11357
OSTI ID:
1262177
Alternate ID(s):
OSTI ID: 1421093
Report Number(s):
LLNL-JRNL-670442; JAPIAU
Journal Information:
Journal of Applied Physics, Vol. 119, Issue 23; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

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The facile fabrication and formation mechanism of self-assembled spherical 3,3′-diamino-4,4′-azoxyfurazan (DAAF) hierarchical structures journal January 2019
Shock initiation of explosives: High temperature hot spots explained journal August 2017
Modeling of the exploding foil initiator and related circuitry for the variable mode of operation journal April 2019
Energetic Al/Ni Superlattice as a Micro-Plasma Generator with Superb Performances journal November 2018