Indications of flow near maximum compression in layered deuterium-tritium implosions at the National Ignition Facility
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 pr...
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| Format: | Article |
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American Physical Society
2017
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| Online Access: | http://hdl.handle.net/1721.1/107698 https://orcid.org/0000-0002-1020-3501 |
| _version_ | 1826208535316267008 |
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| author | 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. Glebov, V. Yu. Hurricane, O. Kritcher, A. LePape, S. Ma, T. Mackinnon, A. Meezan, N. Patel, P. Ralph, J. E. Springer, P. T. Yeamans, C. B. Gatu Johnson, Maria Frenje, Johan A Petrasso, Richard D |
| author2 | Massachusetts Institute of Technology. Plasma Science and Fusion Center |
| author_facet | Massachusetts Institute of Technology. Plasma Science and Fusion Center 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. Glebov, V. Yu. Hurricane, O. Kritcher, A. LePape, S. Ma, T. Mackinnon, A. Meezan, N. Patel, P. Ralph, J. E. Springer, P. T. Yeamans, C. B. Gatu Johnson, Maria Frenje, Johan A Petrasso, Richard D |
| author_sort | Knauer, J. P. |
| collection | MIT |
| description | 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[subscript ion] are inferred from the variance of the primary neutron spectrum. Consistently higher DT than DD T[subscript ion] are observed and the difference is seen to increase with increasing apparent DT T[subscript ion]. The line-of-sight rms variations of both DD and DT T[subscript ion] are small, ∼ 150 eV, indicating an isotropic source. The DD neutron yields are consistently high relative to the DT neutron yields given the observed T[subscript 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 T[subscript ion] greater than the DD T[subscript 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. |
| first_indexed | 2024-09-23T14:07:11Z |
| format | Article |
| id | mit-1721.1/107698 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T14:07:11Z |
| publishDate | 2017 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/1076982022-09-28T18:38:52Z Indications of flow near maximum compression in layered deuterium-tritium implosions at the National Ignition Facility 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. Glebov, V. Yu. Hurricane, O. Kritcher, A. LePape, S. Ma, T. Mackinnon, A. Meezan, N. Patel, P. Ralph, J. E. Springer, P. T. Yeamans, C. B. Gatu Johnson, Maria Frenje, Johan A Petrasso, Richard D Massachusetts Institute of Technology. Plasma Science and Fusion Center Gatu Johnson, Maria Frenje, Johan A Petrasso, Richard D 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[subscript ion] are inferred from the variance of the primary neutron spectrum. Consistently higher DT than DD T[subscript ion] are observed and the difference is seen to increase with increasing apparent DT T[subscript ion]. The line-of-sight rms variations of both DD and DT T[subscript ion] are small, ∼ 150 eV, indicating an isotropic source. The DD neutron yields are consistently high relative to the DT neutron yields given the observed T[subscript 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 T[subscript ion] greater than the DD T[subscript 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. Lawrence Livermore National Laboratory (Contract No. DE-AC52- 07NA27344) 2017-03-24T19:07:53Z 2017-03-24T19:07:53Z 2016-08 2016-02 2016-08-15T22:00:03Z Article http://purl.org/eprint/type/JournalArticle 2470-0045 2470-0053 http://hdl.handle.net/1721.1/107698 Gatu Johnson, M. et al. “Indications of Flow near Maximum Compression in Layered Deuterium-Tritium Implosions at the National Ignition Facility.” Physical Review E 94.2 (2016): n. pag. © 2016 American Physical Society https://orcid.org/0000-0002-1020-3501 en http://dx.doi.org/10.1103/PhysRevE.94.021202 Physical Review E Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. American Physical Society application/pdf American Physical Society American Physical Society |
| spellingShingle | 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. Glebov, V. Yu. Hurricane, O. Kritcher, A. LePape, S. Ma, T. Mackinnon, A. Meezan, N. Patel, P. Ralph, J. E. Springer, P. T. Yeamans, C. B. Gatu Johnson, Maria Frenje, Johan A Petrasso, Richard D Indications of flow near maximum compression in layered deuterium-tritium implosions at the National Ignition Facility |
| title | Indications of flow near maximum compression in layered deuterium-tritium implosions at the National Ignition Facility |
| title_full | Indications of flow near maximum compression in layered deuterium-tritium implosions at the National Ignition Facility |
| title_fullStr | Indications of flow near maximum compression in layered deuterium-tritium implosions at the National Ignition Facility |
| title_full_unstemmed | Indications of flow near maximum compression in layered deuterium-tritium implosions at the National Ignition Facility |
| title_short | Indications of flow near maximum compression in layered deuterium-tritium implosions at the National Ignition Facility |
| title_sort | indications of flow near maximum compression in layered deuterium tritium implosions at the national ignition facility |
| url | http://hdl.handle.net/1721.1/107698 https://orcid.org/0000-0002-1020-3501 |
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