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Title: Development of an X-Ray Talbot-Lau Moire Deflectometer of Fast Density Profile Measurements of Dense Plasmas Generated by Beam Target Interactions

Abstract

For the first time an x-ray Talbot-Lau moiré deflectometer is being developed that will use a flash tube source and fast detector for dynamic density gradient measurements. In Talbot-Lau moiré deflectometry, an x-ray grating makes an mage of itself on a second grating (the Talbot effect) to produce a moiré pattern on a detector. The test object is placed between these gratings, with variations in index of refraction changing the pattern. A third grating in front of an incoherent x-ray source produces an array of coherent sources. With a 150 kV x-ray flash tube as the source, the gratings are placed in a glancing angle setup for performance at ~60 keV. The detector is a gated CCD with a fast scintillator for x-ray conversion. This diagnostic, designed for the Dual-Axis Radiographic Hydrodynamic Test facility (DARHT) at Los Alamos National Laboratory, measures the density profile of dense plasma plumes ejected from beam-target interactions. DARHT has two high-current, pulsed, inductive linear electron accelerators with bremsstrahlung targets at the end of each beam line to create 2-D radiographic images of hydrodynamic tests. One multipulse accelerator has up to four beam pulses striking the same target within 2 μs. Computer simulations that model targetmore » evolution and ejected material between pulses are used to design these targets for optimal radiographic performance; the x-ray deflectometer will directly measure density gradients in the ejected plumes and provide the first experimental constraints to these models. During the first year, currently underway, the diagnostic systems are being designed. In year two, the flash tube and fast detector will be deployed at DARHT for radiographic imaging while the deflectometer is built and tested on the bench with a continuous source. In year three, the fast deflectometer will be installed on DARHT and density measurements will be performed.« less

Authors:
 [1];  [1];  [1];  [2];  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. John Hopkins University
Publication Date:
Research Org.:
Nevada Test Site/National Security Technologies, LLC (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)
OSTI Identifier:
1240382
Report Number(s):
DOE/NV/25946-2490
DOE Contract Number:  
AC52-06NA25946
Resource Type:
Conference
Resource Relation:
Conference: IEEE Pulsed Power Conference 2015 June 2015
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Clayton, Daniel J., Berninger, Michael J., Meidinger, Alfred, Stutman, Daniel, and Valdivia, Maria Pia. Development of an X-Ray Talbot-Lau Moire Deflectometer of Fast Density Profile Measurements of Dense Plasmas Generated by Beam Target Interactions. United States: N. p., 2015. Web.
Clayton, Daniel J., Berninger, Michael J., Meidinger, Alfred, Stutman, Daniel, & Valdivia, Maria Pia. Development of an X-Ray Talbot-Lau Moire Deflectometer of Fast Density Profile Measurements of Dense Plasmas Generated by Beam Target Interactions. United States.
Clayton, Daniel J., Berninger, Michael J., Meidinger, Alfred, Stutman, Daniel, and Valdivia, Maria Pia. Mon . "Development of an X-Ray Talbot-Lau Moire Deflectometer of Fast Density Profile Measurements of Dense Plasmas Generated by Beam Target Interactions". United States. https://www.osti.gov/servlets/purl/1240382.
@article{osti_1240382,
title = {Development of an X-Ray Talbot-Lau Moire Deflectometer of Fast Density Profile Measurements of Dense Plasmas Generated by Beam Target Interactions},
author = {Clayton, Daniel J. and Berninger, Michael J. and Meidinger, Alfred and Stutman, Daniel and Valdivia, Maria Pia},
abstractNote = {For the first time an x-ray Talbot-Lau moiré deflectometer is being developed that will use a flash tube source and fast detector for dynamic density gradient measurements. In Talbot-Lau moiré deflectometry, an x-ray grating makes an mage of itself on a second grating (the Talbot effect) to produce a moiré pattern on a detector. The test object is placed between these gratings, with variations in index of refraction changing the pattern. A third grating in front of an incoherent x-ray source produces an array of coherent sources. With a 150 kV x-ray flash tube as the source, the gratings are placed in a glancing angle setup for performance at ~60 keV. The detector is a gated CCD with a fast scintillator for x-ray conversion. This diagnostic, designed for the Dual-Axis Radiographic Hydrodynamic Test facility (DARHT) at Los Alamos National Laboratory, measures the density profile of dense plasma plumes ejected from beam-target interactions. DARHT has two high-current, pulsed, inductive linear electron accelerators with bremsstrahlung targets at the end of each beam line to create 2-D radiographic images of hydrodynamic tests. One multipulse accelerator has up to four beam pulses striking the same target within 2 μs. Computer simulations that model target evolution and ejected material between pulses are used to design these targets for optimal radiographic performance; the x-ray deflectometer will directly measure density gradients in the ejected plumes and provide the first experimental constraints to these models. During the first year, currently underway, the diagnostic systems are being designed. In year two, the flash tube and fast detector will be deployed at DARHT for radiographic imaging while the deflectometer is built and tested on the bench with a continuous source. In year three, the fast deflectometer will be installed on DARHT and density measurements will be performed.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2015},
month = {6}
}

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