Propagation or failure of detonation across an air gap in an LX-17 column: continuous time-dependent detonation or shock speed using the Embedded Fiber Optic (EFO) technique Page: 3 of 17
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Propagation or failure of detonation across an air gap in an LX-17 column: continuous
time-dependent detonation or shock speed using the Embedded Fiber Optic (EFO)
D.E. Hare, J.B. Chandler, Steven M. Compton, Raul G. Garza, Denise A. Grimsley,
Andrew Hernandez, Richard J. Villafana, James T. Wade, Sally R. Weber,
Bradley M. Wong, and P. Clark Souers
Lawrence Livermore National Laboratory
7000 East Avenue
Livermore CA 94551
The detailed history of the shock / detonation wave propagation after crossing a room-
temperature-room-pressure (RTP) air gap between a 25.4 mm diameter LX-17 donor
column and a 25.4 mm diameter by 25.4 mm long LX-17 acceptor pellet is investigated
for three different gap widths (3.07, 2.08, and 0.00 mm) using the Embedded Fiber Optic
(EFO) technique. The 2.08 mm gap propagated and the 3.07 mm gap failed and this can
be seen clearly and unambiguously in the EFO data even though the 25.4 mm-long
acceptor pellet would be considered quite short for a determination by more traditional
means such as pins.
The EFO technique is a relatively new technique that was developed by D.R. Goosman,
G.R. Avara, and their collaborators at LLNL for measuring wave speeds (shock and
detonation speeds) continuously in time using laser Doppler velocimetry techniques .
The velocimetry system used in these experiments is a custom dual-cavity Fabry-Perot
velocimeter equipped with a special Fabry-Perot filter to preferentially reduce the non-
Doppler shifted component relative to the Doppler-shifted signal. This system has been
previously described in some detail [2-4].
This report is a report of data-only. It is focused on results obtained using the EFO-
Fabry-Perot system, specifically on the ability of a detonation in a 25.4 mm diameter LX-
17 column to propagate or fail due to an air gap in the column. These results were
obtained in three separate shots fired at the 10 kg spherical tank of the High Explosives
Application Facility (HEAF) at Lawrence Livermore National Laboratory (LLNL). The
shots were all fired with the HE at the ambient temperature of the facility which is
typically about 24 C
The LX-17 pellets were from two separate pressings but the molding powder for both
pressings was LX-17-1 from LLNL sample number C-063. The molding powder was hot
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Hare, D E; Chandler, J B; Compton, S M; Garza, R G; Grimsley, D A; Hernandez, A et al. Propagation or failure of detonation across an air gap in an LX-17 column: continuous time-dependent detonation or shock speed using the Embedded Fiber Optic (EFO) technique, report, January 16, 2008; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc899356/m1/3/: accessed February 17, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.