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Title: IN-SITU MAGNETIC GAUGING TECHNIQUE USED AT LANL

Abstract

No abstract prepared.

Authors:
; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
785448
Report Number(s):
LA-UR-99-3277
TRN: US200306%%30
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 Jul 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; LANL; ON-LINE MEASUREMENT SYSTEMS; MAGNETIC PROPERTIES; MEASURING METHODS

Citation Formats

S. A. SHEFFIELD, R. L. GUSTAVSEN, and R. R. ALCON. IN-SITU MAGNETIC GAUGING TECHNIQUE USED AT LANL. United States: N. p., 1999. Web.
S. A. SHEFFIELD, R. L. GUSTAVSEN, & R. R. ALCON. IN-SITU MAGNETIC GAUGING TECHNIQUE USED AT LANL. United States.
S. A. SHEFFIELD, R. L. GUSTAVSEN, and R. R. ALCON. 1999. "IN-SITU MAGNETIC GAUGING TECHNIQUE USED AT LANL". United States. doi:. https://www.osti.gov/servlets/purl/785448.
@article{osti_785448,
title = {IN-SITU MAGNETIC GAUGING TECHNIQUE USED AT LANL},
author = {S. A. SHEFFIELD and R. L. GUSTAVSEN and R. R. ALCON},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1999,
month = 7
}

Conference:
Other availability
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  • Desensitization of explosives by preshocking is being studied using the well-supported plane shock waves generated by a gas gun. Evolution of the waves in the explosive is monitored using in-material multiple magnetic gauges to measure particle velocity in the lagrangian frame, over {approx} 3{mu}s of run. PBX-9404, PBX-9502 have been studied, at pressures up to 10.5 GPa. A substantial extension of the run to detonation is observed in PBX-9404, with the run beginning approximately at the end of the preshocked region. A reactive wave is observed while the preshock persists in both PBX-9404 and PBX-9501, but evidently does not contributemore » to the detonation wave or shorten the run to detonation. PBX-9502 is inert at pressures accessible with the gas gun, but serves to clarify the progress of multiple shocks over the off-Hugoniot EOS surface and the shock dynamics of wave coalescence.« less
  • Our gas-driven two-stage gun was designed and built to do initiation studies on insensitive high explosives as well as other equation of state experiments on inert materials. Our preferred method of measuring initiation phenomena involves the use of magnetic particle velocity gauges. In order to accommodate this type of gauging in our two-stage gun, projectile velocity was sacrificed in favor of a larger experimental target area (obtained by using a 50 mm diameter launch tube). We have used magnetic gauging on our 72-mm bore diameter single-stage gun for over 15 years and it has proven a very effective technique tomore » monitor reactive shock wave evolution. This technique has now been adapted to our gas-driven two-stage gun. We describe the method used, as well as some of the difficulties that arose while installing this technique. Several magnetic gauge experiments have been completed on plastic materials. Waveforms obtained in one experiment are given, along with the Hugoniot information that was obtained. This new technique is now working quite well, as is evidenced by the data. To our knowledge, this is the first time magnetic gauging has been used on a two-stage gun. We have also made changes to the burst diaphragm package in the transition section to ensure that the petals do not break off during the opening process and to increase the burst pressure. This will also be discussed briefly.« less
  • The LANL gas-driven two-stage gun was designed and built to do initiation studies on insensitive high explosives as well as equation of state and reaction experiments on other materials. The preferred method of measuring reaction phenomena involves the use of in-situ magnetic particle velocity gauges. In order to accommodate this type of gauging in the two-stage gun, it has a 50-mm-diameter launch tube. The authors have sued magnetic gauging on the 72-mm bore diameter single-stage gun for over 15 years and it has proven a very effective technique for all types of shock wave experiments, including those on high explosives.more » This technique has now been installed on the gas-driven two-stage gun. They describe the method used, as well as some of the difficulties that arose during the installation. Several magnetic gauge experiments have been completed on plastic materials. Waveforms obtained in some of the experiments will be discussed. Up to 10 in-situ particle velocity measurements can be made in a single experiment. This new technique is now working quite well, as is evidenced by the data. To their knowledge, this is the first time magnetic gauging has been used on a two-stage gun.« less