U.S. Department of EnergyOffice of Scientific and Technical Information
Indications of flow near maximum compression in layered DT implosions at the National Ignition Facility
Abstract
An accurate understanding of burn dynamics in implosions of cryogenically layered deuterium and tritium (DT) filled capsules, obtained partly through precision diagnosis of these experiments, is essential for assessing the impediments to achieving ignition at the National Ignition Facility (NIF). 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 Tions are observed, and the difference is seen to increase with increasing apparent DT Tion. The line-of-sight r.m.s. variations of both DD and DT Tion are small, ~150 eV, indicating an isotropic source. DD neutron yields are consistently high relative to the DT neutron yields given the observed Tions. 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 DT Tion > DD Tion, but are in a 1D model insufficient to explain the data. We hypothesize that in a 3D interpretation, these effects combined could explain the results.
- Authors:
- more »
- Publication Date:
- DOE Contract Number:
- NA0002949; AC52-07NA27344
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
- OSTI Identifier:
- 1879097
- DOI:
- https://doi.org/10.7910/DVN/DSBDBZ
Citation Formats
Johnson, M. Gatu, 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., Döppner, 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 DT implosions at the National Ignition Facility. United States: N. p., 2018.
Web. doi:10.7910/DVN/DSBDBZ.
Johnson, M. Gatu, 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., Döppner, 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 DT implosions at the National Ignition Facility. United States. doi:https://doi.org/10.7910/DVN/DSBDBZ
Johnson, M. Gatu, 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., Döppner, 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. 2018.
"Indications of flow near maximum compression in layered DT implosions at the National Ignition Facility". United States. doi:https://doi.org/10.7910/DVN/DSBDBZ. https://www.osti.gov/servlets/purl/1879097. Pub date:Tue Oct 16 00:00:00 EDT 2018
@article{osti_1879097,
title = {Indications of flow near maximum compression in layered DT implosions at the National Ignition Facility},
author = {Johnson, M. Gatu 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 Döppner, 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 and tritium (DT) filled capsules, obtained partly through precision diagnosis of these experiments, is essential for assessing the impediments to achieving ignition at the National Ignition Facility (NIF). 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 Tions are observed, and the difference is seen to increase with increasing apparent DT Tion. The line-of-sight r.m.s. variations of both DD and DT Tion are small, ~150 eV, indicating an isotropic source. DD neutron yields are consistently high relative to the DT neutron yields given the observed Tions. 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 DT Tion > DD Tion, but are in a 1D model insufficient to explain the data. We hypothesize that in a 3D interpretation, these effects combined could explain the results.},
doi = {10.7910/DVN/DSBDBZ},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {10}
}
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Works referencing / citing this record:
Indications of flow near maximum compression in layered deuterium-tritium implosions at the National Ignition Facility
journal, August 2016
- Gatu Johnson, M.; Knauer, J. P.; Cerjan, C. J.
- Physical Review E, Vol. 94, Issue 2