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Title: Frequency content of current pulses in slapper detonator bridges

Abstract

DFT amplitudes are obtained for digital current pulse files. The frequency content of slapper detonator bridge current pulses is obtained. The frequencies are confined well within the passband of the CVR used to sample them.

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
898461
Report Number(s):
UCRL-TR-226959
TRN: US200708%%106
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; AMPLITUDES; DETONATORS; ENGINEERING

Citation Formats

Carpenter, K H. Frequency content of current pulses in slapper detonator bridges. United States: N. p., 2006. Web. doi:10.2172/898461.
Carpenter, K H. Frequency content of current pulses in slapper detonator bridges. United States. doi:10.2172/898461.
Carpenter, K H. Mon . "Frequency content of current pulses in slapper detonator bridges". United States. doi:10.2172/898461. https://www.osti.gov/servlets/purl/898461.
@article{osti_898461,
title = {Frequency content of current pulses in slapper detonator bridges},
author = {Carpenter, K H},
abstractNote = {DFT amplitudes are obtained for digital current pulse files. The frequency content of slapper detonator bridge current pulses is obtained. The frequencies are confined well within the passband of the CVR used to sample them.},
doi = {10.2172/898461},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Dec 18 00:00:00 EST 2006},
month = {Mon Dec 18 00:00:00 EST 2006}
}

Technical Report:

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  • A unique line of reel-to-reel processing equipment is being developed to fabricate an integral detonator/cable assembly. A wide variety of custom designed reel-to-reel processing and assembly equipment supports this in-house capability at Mound. Processes have been established to manufacture the major slapper detonator components (bridges and cable-conductors), and most of the major operations can be performed on reels of 35-mm wide flexible circuit materials. This is possible because the images are placed in-line along the length of the film. Design concepts that show how the reel-to-reel approach could be extended to nearly all assembly operations have been established. These conceptsmore » provide for the fabrication of different detonator designs with minimal tooling changes.« less
  • A unique bonding system was designed and built as an addition to the other reel-to-reel processing equipment in the Tape Process Laboratory at Mound. This bonder supports an in-house flexible circuit manufacturing capability which has been established by Mound's Tape Processing Group. This bonder, like most of the equipment in the Tape Process Laboratory, was designed and built to Mound's specifications. This bonding system integrates into one machine all operations necessary to prepare, bond, and test the joint between a flexible printed circuit cable and an etched (copper/Kapton) bridge. Design specifications were established for all operations (cable cleaning, assembly, bonding,more » resistance testing, vacuum stress test, and closed circuit TV inspection). The design concepts used for the design of the Integrated Bonding System provided for the bonding of different detonator cables and bridge designs with minimal tooling changes. 16 figs.« less
  • A nickel spot plater has been built as an addition to the other reel-to-reel processing equipment in the Tape Process Laboratory at Mound. This plater, like most of the equipment in the Tape Process Laboratory, is a prototype built to meet Mound's product requirements. This Plating System enables Mound to selectively plate specific areas (connector ends) on a flexible printed circuit cable. 6 refs., 11 figs., 1 tab.
  • This report discusses diagnostics which have been used to evaluate CDU characteristics and performance, slapper characteristics and performance and the response of a HE detonator output pellet to a slapper stimulus. Many of the diagnostics discussed are appropriate for development and production testing. These include CVR current measurements, voltage probe measurements, time-of-flight measurements, threshold measurements, function time measurements, use of steel witness plates and determination of design margin. Some of the more-sophisticated, expensive diagnostics discussed have yielded very useful information, but are not required for development and production testing. 8 refs., 9 figs., 1 tab.
  • Under the Lawrence Livermore National Laboratories (LLNL) Small Business Technology Transfer Program, assistance was given to Quantic Industries Inc. to use the High Explosive Applications Facility (HEAF), its apparatus, and LLNL expertise to characterize the performance of Quantic`s micro-clad copper/kapton slapper detonator assemblies and establish their threshold to detonate HNS-IV. The project involved measuring the performance of these slapper detonators, otherwise known as Exploding Foil Initiators (EFI`s), manufactured by Quantic Industries Inc. Slapper performance was measured by using a laser velocimeter, which is an expensive and specialized facility which Quantic does not own. The authors measured slapper velocity vs. timemore » as a function of charging voltage. Quantic supplied slappers which were coated with {approximately}100 nm of Al to provide a reflective surface for the laser velocimeter measurements. LLNL provided to a capacitor discharge unit (CDU) to fire the slappers and matched the Quantic CDU waveforms as close as possible.« less