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Title: Indications of flow near maximum compression in layered deuterium-tritium implosions at the National Ignition Facility

Abstract

An accurate understanding of burn dynamics in implosions of cryogenically layered deuterium (D) and tritium (T) filled capsules, obtained partly through precision diagnosis of these experiments, is essential for assessing the impediments to achieving ignition at the National Ignition Facility. We present measurements of neutrons from such implosions. The apparent ion temperatures Tion are inferred from the variance of the primary neutron spectrum. Consistently higher DT than DD Tion are observed and the difference is seen to increase with increasing apparent DT Tion. The line-of-sight rms variations of both DD and DT Tion are small, ~150 eV, indicating an isotropic source. The DD neutron yields are consistently high relative to the DT neutron yields given the observed Tion. Spatial and temporal variations of the DT temperature and density, DD-DT differential attenuation in the surrounding DT fuel, and fluid motion variations contribute to a DT Tion > DD Tion, but are in a one-dimensional model insufficient to explain the data. Lastly, we hypothesize that in a three-dimensional interpretation, these effects combined could explain the results.

Authors:
 [1];  [2];  [3];  [3];  [3];  [3];  [3];  [4];  [3];  [3];  [3];  [3];  [3];  [3];  [3];  [3];  [3];  [1];  [2];  [3] more »;  [3];  [3];  [3];  [3];  [3];  [3];  [1];  [3];  [3];  [3] « less
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Univ. of Rochester, Rochester, NY (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. General Atomics, San Diego, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1313547
Alternate Identifier(s):
OSTI ID: 1294718; OSTI ID: 1324684
Report Number(s):
LLNL-JRNL-682118
Journal ID: ISSN 2470-0045; PLEEE8
Grant/Contract Number:  
AC52-07NA27344; NA0001857; NA0002949
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 94; Journal Issue: 2; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 29 ENERGY PLANNING, POLICY AND ECONOMY; 70 PLASMA PHYSICS AND FUSION; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Gatu Johnson, M., Knauer, J. P., Cerjan, C. J., Eckart, M. J., Grim, G. P., Hartouni, E. P., Hatarik, R., Kilkenny, J. D., Munro, D. H., Sayre, D. B., Spears, B. K., Bionta, R. M., Bond, E. J., Caggiano, J. A., Callahan, D., Casey, D. T., Doppner, T., Frenje, J. A., Glebov, V. Yu., Hurricane, O., Kritcher, A., LePape, S., Ma, T., Mackinnon, A., Meezan, N., Patel, P., Petrasso, R. D., Ralph, J. E., Springer, P. T., and Yeamans, C. B. Indications of flow near maximum compression in layered deuterium-tritium implosions at the National Ignition Facility. United States: N. p., 2016. Web. https://doi.org/10.1103/PhysRevE.94.021202.
Gatu Johnson, M., Knauer, J. P., Cerjan, C. J., Eckart, M. J., Grim, G. P., Hartouni, E. P., Hatarik, R., Kilkenny, J. D., Munro, D. H., Sayre, D. B., Spears, B. K., Bionta, R. M., Bond, E. J., Caggiano, J. A., Callahan, D., Casey, D. T., Doppner, T., Frenje, J. A., Glebov, V. Yu., Hurricane, O., Kritcher, A., LePape, S., Ma, T., Mackinnon, A., Meezan, N., Patel, P., Petrasso, R. D., Ralph, J. E., Springer, P. T., & Yeamans, C. B. Indications of flow near maximum compression in layered deuterium-tritium implosions at the National Ignition Facility. United States. https://doi.org/10.1103/PhysRevE.94.021202
Gatu Johnson, M., Knauer, J. P., Cerjan, C. J., Eckart, M. J., Grim, G. P., Hartouni, E. P., Hatarik, R., Kilkenny, J. D., Munro, D. H., Sayre, D. B., Spears, B. K., Bionta, R. M., Bond, E. J., Caggiano, J. A., Callahan, D., Casey, D. T., Doppner, T., Frenje, J. A., Glebov, V. Yu., Hurricane, O., Kritcher, A., LePape, S., Ma, T., Mackinnon, A., Meezan, N., Patel, P., Petrasso, R. D., Ralph, J. E., Springer, P. T., and Yeamans, C. B. Mon . "Indications of flow near maximum compression in layered deuterium-tritium implosions at the National Ignition Facility". United States. https://doi.org/10.1103/PhysRevE.94.021202. https://www.osti.gov/servlets/purl/1313547.
@article{osti_1313547,
title = {Indications of flow near maximum compression in layered deuterium-tritium implosions at the National Ignition Facility},
author = {Gatu Johnson, M. and Knauer, J. P. and Cerjan, C. J. and Eckart, M. J. and Grim, G. P. and Hartouni, E. P. and Hatarik, R. and Kilkenny, J. D. and Munro, D. H. and Sayre, D. B. and Spears, B. K. and Bionta, R. M. and Bond, E. J. and Caggiano, J. A. and Callahan, D. and Casey, D. T. and Doppner, T. and Frenje, J. A. and Glebov, V. Yu. and Hurricane, O. and Kritcher, A. and LePape, S. and Ma, T. and Mackinnon, A. and Meezan, N. and Patel, P. and Petrasso, R. D. and Ralph, J. E. and Springer, P. T. and Yeamans, C. B.},
abstractNote = {An accurate understanding of burn dynamics in implosions of cryogenically layered deuterium (D) and tritium (T) filled capsules, obtained partly through precision diagnosis of these experiments, is essential for assessing the impediments to achieving ignition at the National Ignition Facility. We present measurements of neutrons from such implosions. The apparent ion temperatures Tion are inferred from the variance of the primary neutron spectrum. Consistently higher DT than DD Tion are observed and the difference is seen to increase with increasing apparent DT Tion. The line-of-sight rms variations of both DD and DT Tion are small, ~150 eV, indicating an isotropic source. The DD neutron yields are consistently high relative to the DT neutron yields given the observed Tion. Spatial and temporal variations of the DT temperature and density, DD-DT differential attenuation in the surrounding DT fuel, and fluid motion variations contribute to a DT Tion > DD Tion, but are in a one-dimensional model insufficient to explain the data. Lastly, we hypothesize that in a three-dimensional interpretation, these effects combined could explain the results.},
doi = {10.1103/PhysRevE.94.021202},
journal = {Physical Review E},
number = 2,
volume = 94,
place = {United States},
year = {2016},
month = {8}
}

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