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Proceedings Paper

Pulsed High-Energy Radiographic Machine Emitting X-Rays (PHERMEX): Applications To Study High-Pressure Flow And Detonation Waves
Author(s): Richard D. Dick
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Paper Abstract

PHERMEX, an acronym for Pulsed High-Energy Radiographic Machine Emitting X Rays, has been used as a diagnostic tool to make quantitative measurements from radiographs of inert materials under dynamic high-pressure conditions and of explosives during the detonation process. In some experiments, radiography is the best method (compared to high-speed optical cameras and contactor pins) to study complicated hydro-dynamic flow occuring in a dynamic experiment. To demonstrate the versatility and uniqueness of PHERMEX and the radiographic method, several experiments on inert solids having high and low atomic numbers will be discussed with some particulars. This includes the observation of the 11.0-GPa-pressure phase transition for antimony and the accompanying two-shock structure and the off-Hugoniot data for lead using regular reflection. Also, by careful design of a radiographic experiment, the Hugoniot state behind a shock front can be completely and precisely specified. Aluminium is an example of a material studies in this manner. PHERMEX is useful in studying some detonation properties of explosives. As an illustration, the discussion will include radiographic results of divergence characteristics of a detonation wave in sensitive and insensitive explosives as it propagates past a corner and the effect of preshocking on the detonation process of insensitive explosives when the detonation wave interacts with a region that has been shock-compressed at a pressure too low to cause detonation. The above are only a few of the hundreds of radiographic studies of shock-wave phenomena of solids and detonation characteristics of explosives. A complete list of PHERMEX experiments is published in LASL PHERMEX Data Volumes, I, II, and III, "University of California Press, Berkeley and Los Angeles, California, 1980, C.L. Mader Editor.

Paper Details

Date Published: 9 August 1983
PDF: 16 pages
Proc. SPIE 0312, 1st European Conf on Cineradiography with Photons or Particles, (9 August 1983); doi: 10.1117/12.932915
Show Author Affiliations
Richard D. Dick, Los Alamos National Laboratory (United States)

Published in SPIE Proceedings Vol. 0312:
1st European Conf on Cineradiography with Photons or Particles
Jacques J. Marilleau, Editor(s)

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