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: 4 of 17
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ram-pressed to a density ranging from 1.913 to 1.916 g/cc. A special die set with a central
pin was used to press the pellets with a hole to accommodate the probe without resorting
to an additional drilling operation. The 1.60 mm diameter hole is located on the pellet
axis and makes a snug fit with our polytetrafluoroethylene (PTFE) clad / aqueous CsCl
solution core probe. A PBX-9501 pellet with hole was used as a booster and an RP-1
detonator  was used to initiate the 9501. A diagram representing the configuration of
all the shots is shown in Fig. 1.
Average density for each pellet was determined as mass / volume. Volume was computed
from the measured height and diameter of each pellet. We believe our accuracy on the
mass / volume measurement is about 0.1%.
The shots were all fired horizontally in pine-wood V-blocks. Hence for all intents and
purposes the shots are unconfined and can be simulated with an appropriate 2-D
hydrocode to test various LX-17 models.
The gaps were set and maintained by small Lucite shims. The shims contacted the HE at
two small-area locations near the perimeter of the column (for example, see Figs. 2 and
3) hence the gap material was effectively RTP air and not Lucite. Although we did not
do a detailed assessment of gap accuracy we expect the gaps to be accurate to about 2
mils or 50 microns, roughly one to two percent of the gap width.
9501 LX-17 LX-17 LX-17
Lucite gap EFO probe
Fig 1. A diagram of the configuration used for the three "gap shots" GGR225 (3.07 mm
gap), 226 (2.08 mm gap), and 227 (no gap). The EFO probe can be reasonably modeled
as a solid rod of PTFE that is 1.60 mm diameter. The Lucite collar that holds the
detonator in place is about 12.7 mm in length and the same diameter as the rest of the
column. The gap and confinement are both RTP air.
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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/m1/4/: accessed November 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.