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Title: X-ray transport and radiation response assessment (XTRRA) experiments at the National Ignition Facility

Abstract

Our team has developed an experimental platform to evaluate the x-ray-generated stress and impulse in materials. Experimental activities include x-ray source development, design of the sample mounting hardware and sensors interfaced to the NIF’s diagnostics insertion system, and system integration into the facility. This paper focuses on the X-ray Transport and Radiation Response Assessment (XTRRA) test cassettes built for these experiments. The test cassette is designed to position six samples at three predetermined distances from the source, each known to within ±1% accuracy. Built in calorimeters give in situ measurements of the x-ray environment along the sample lines of sight. We discuss the measured accuracy of sample responses, as well as planned modifications to the XTRRA cassette.

Authors:
ORCiD logo [1];  [1];  [1];  [2];  [3]; ORCiD logo [4];  [1];  [1];  [1];  [2];  [2];  [2];  [5];  [3];  [3];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Fifth Gait Technologies, Inc., Huntsville, AL (United States)
  3. Defense Threat Reduction Agency, Fort Belvoir, VA (United States)
  4. Naval Research Lab. (NRL), Washington, DC (United States)
  5. Dynasen, Inc., Goleta, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1305814
Report Number(s):
LLNL-JRNL-692683
Journal ID: ISSN 0034-6748; RSINAK
Grant/Contract Number:
AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 87; Journal Issue: 11; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING

Citation Formats

Fournier, K. B., Brown, Jr., C. G., Yeoman, M. F., Fisher, J. H., Seiler, S. W., Hinshelwood, D., Compton, S., Holdener, F. R., Kemp, G. E., Newlander, C. D., Gilliam, R. P., Froula, N., Lilly, M., Davis, J. F., Lerch, MAJ. A., and Blue, B. E. X-ray transport and radiation response assessment (XTRRA) experiments at the National Ignition Facility. United States: N. p., 2016. Web. doi:10.1063/1.4960501.
Fournier, K. B., Brown, Jr., C. G., Yeoman, M. F., Fisher, J. H., Seiler, S. W., Hinshelwood, D., Compton, S., Holdener, F. R., Kemp, G. E., Newlander, C. D., Gilliam, R. P., Froula, N., Lilly, M., Davis, J. F., Lerch, MAJ. A., & Blue, B. E. X-ray transport and radiation response assessment (XTRRA) experiments at the National Ignition Facility. United States. doi:10.1063/1.4960501.
Fournier, K. B., Brown, Jr., C. G., Yeoman, M. F., Fisher, J. H., Seiler, S. W., Hinshelwood, D., Compton, S., Holdener, F. R., Kemp, G. E., Newlander, C. D., Gilliam, R. P., Froula, N., Lilly, M., Davis, J. F., Lerch, MAJ. A., and Blue, B. E. 2016. "X-ray transport and radiation response assessment (XTRRA) experiments at the National Ignition Facility". United States. doi:10.1063/1.4960501. https://www.osti.gov/servlets/purl/1305814.
@article{osti_1305814,
title = {X-ray transport and radiation response assessment (XTRRA) experiments at the National Ignition Facility},
author = {Fournier, K. B. and Brown, Jr., C. G. and Yeoman, M. F. and Fisher, J. H. and Seiler, S. W. and Hinshelwood, D. and Compton, S. and Holdener, F. R. and Kemp, G. E. and Newlander, C. D. and Gilliam, R. P. and Froula, N. and Lilly, M. and Davis, J. F. and Lerch, MAJ. A. and Blue, B. E.},
abstractNote = {Our team has developed an experimental platform to evaluate the x-ray-generated stress and impulse in materials. Experimental activities include x-ray source development, design of the sample mounting hardware and sensors interfaced to the NIF’s diagnostics insertion system, and system integration into the facility. This paper focuses on the X-ray Transport and Radiation Response Assessment (XTRRA) test cassettes built for these experiments. The test cassette is designed to position six samples at three predetermined distances from the source, each known to within ±1% accuracy. Built in calorimeters give in situ measurements of the x-ray environment along the sample lines of sight. We discuss the measured accuracy of sample responses, as well as planned modifications to the XTRRA cassette.},
doi = {10.1063/1.4960501},
journal = {Review of Scientific Instruments},
number = 11,
volume = 87,
place = {United States},
year = 2016,
month = 8
}

Journal Article:
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  • Our team has developed an experimental platform to evaluate the x-ray-generated stress and impulse in materials. Experimental activities include x-ray source development, design of the sample mounting hardware and sensors interfaced to the National Ignition Facility’s diagnostics insertion system, and system integration into the facility. This paper focuses on the X-ray Transport and Radiation Response Assessment (XTRRA) test cassettes built for these experiments. The test cassette is designed to position six samples at three predetermined distances from the source, each known to within ±1% accuracy. Built-in calorimeters give in situ measurements of the x-ray environment along the sample lines ofmore » sight. The measured accuracy of sample responses as well as planned modifications to the XTRRA cassette is discussed.« less
  • Here, indirect drive experiments at the National Ignition Facility are designed to achieve fusion by imploding a fuel capsule with x rays from a laser-driven hohlraum. Previous experiments have been unable to determine whether a deficit in measured ablator implosion velocity relative to simulations is due to inadequate models of the hohlraum or ablator physics. ViewFactor experiments allow for the first time a direct measure of the x-ray drive from the capsule point of view. The experiments show a 15%–25% deficit relative to simulations and thus explain nearly all of the disagreement with the velocity data. In addition, the datamore » from this open geometry provide much greater constraints on a predictive model of laser-driven hohlraum performance than the nominal ignition target.« less
  • The NIF is being configured so as to `not preclude` the conduct of radiation sciences experiments that will contribute to evaluating the readiness of military systems and components to withstand radiation environments. The range of possible experimental environments and the flexibility to introduce various types of experimental packages suggests synergism with experiments related to Inertial Fusion Energy development on the NIF. The design status of NIF features to support radiation sciences experiments is described, and a relationship to their applicability to IFE experimentation on NIF is discussed. 8 refs., 1 fig.
  • An indirectly-driven shock tube experiment fielded on the National Ignition Facility (NIF) was used to create a high-energy-density hydrodynamics platform at unprecedented scale. Scaling up a shear-induced mixing experiment previously fielded at OMEGA, the NIF shear platform drives 130 μm/ns shocks into a CH foam-filled shock tube (~ 60 mg/cc) with interior dimensions of 1.5 mm diameter and 5 mm length. The pulse-shaping capabilities of the NIF are used to extend the drive for >10 ns, and the large interior tube volumes are used to isolate physics-altering edge effects from the region of interest. The scaling of the experiment tomore » the NIF allows for considerable improvement in maximum driving time of hydrodynamics, in fidelity of physics under examination, and in diagnostic clarity. Details of the experimental platform and post-shot simulations used in the analysis of the platform-qualifying data are presented. Hydrodynamic scaling is used to compare shear data from OMEGA with that from NIF, suggesting a possible change in the dimensionality of the instability at late times from one platform to the other.« less