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

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.

doi:10.1103/PhysRevE.94.021202

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

Journal Article · Mon Aug 15 04:00:00 EDT 2016 · Physical Review E

DOI:https://doi.org/10.1103/PhysRevE.94.021202· OSTI ID:1313547

Gatu Johnson, M. ^[1]; Knauer, J. P. ^[2]; Cerjan, C. J. ^[3]; Eckart, M. J. ^[3]; Grim, G. P. ^[3]; Hartouni, E. P. ^[3]; Hatarik, R. ^[3]; Kilkenny, J. D. ^[4]; Munro, D. H. ^[3]; Sayre, D. B. ^[3]; Spears, B. K. ^[3]; Bionta, R. M. ^[3]; Bond, E. J. ^[3]; Caggiano, J. A. ^[3]; Callahan, D. ^[3]; Casey, D. T. ^[3]; Doppner, T. ^[3]; Frenje, J. A. ^[1]; Glebov, V. Yu. ^[2]; Hurricane, O. ^[3] more »

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Univ. of Rochester, Rochester, NY (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
General Atomics, San Diego, CA (United States)

Here, 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 T_ion are inferred from the variance of the primary neutron spectrum. Consistently higher DT than DD T_ion are observed and the difference is seen to increase with increasing apparent DT T_ion. The line-of-sight rms variations of both DD and DT T_ion are small, ~150eV, indicating an isotropic source. The DD neutron yields are consistently high relative to the DT neutron yields given the observed T_ion. 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 greater than the DD T_ion, but are in a one-dimensional model insufficient to explain the data. We hypothesize that in a three-dimensional interpretation, these effects combined could explain the results.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1313547

Alternate ID(s):: OSTI ID: 1324684
OSTI ID: 1294718

Report Number(s):: LLNL-JRNL--682118

Journal Information:: Physical Review E, Journal Name: Physical Review E Journal Issue: 2 Vol. 94; ISSN PLEEE8; ISSN 2470-0045

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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