First look at neutron emission shape characteristics of ignition hotspots at the National Ignition Facility (invited).
| Title: | First look at neutron emission shape characteristics of ignition hotspots at the National Ignition Facility (invited). |
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| Authors: | Durocher M; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.; Geppert-Kleinrath V; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.; Danly CR; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.; Wilde CH; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.; Saavedra GJ; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.; Freeman MS; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.; Fatherley VE; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.; Mendoza EF; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.; Tafoya LR; Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.; Volegov PL; Lawrence Livermore National Laboratory, Livermore, California 94550, USA.; Fittinghoff DN; Lawrence Livermore National Laboratory, Livermore, California 94550, USA.; Rubery M; Lawrence Livermore National Laboratory, Livermore, California 94550, USA. |
| Source: | The Review of scientific instruments [Rev Sci Instrum] 2024 Sep 01; Vol. 95 (9). |
| Publication Type: | Journal Article |
| Language: | English |
| Journal Info: | Publisher: American Institute Of Physics Country of Publication: United States NLM ID: 0405571 Publication Model: Print Cited Medium: Internet ISSN: 1089-7623 (Electronic) Linking ISSN: 00346748 NLM ISO Abbreviation: Rev Sci Instrum Subsets: MEDLINE; PubMed not MEDLINE |
| Imprint Name(s): | Publication: 1933- : Woodbury, N.Y. : American Institute Of Physics; Original Publication: 1930-1932 : Menasha, WI : Optical Society of America |
| Abstract: | The nuclear imaging system has been capturing neutron images of inertial confinement fusion (ICF) driven implosions for over a decade at the National Ignition Facility. This imaging system has evolved from one to three nearly orthogonal lines-of-sight, allowing for the study of three-dimensional shape characteristics of ignition shots. Limited-view tomography algorithms help visualize the burning hotspot in 3D and assess neutron source geometry using Legendre mode parameters. With its neutron, gamma-ray, and x-ray image reconstruction capabilities, NIS has provided critical insight into mechanisms that have limited implosion performance, such as fill tube diameter for ignition-type targets. This comprehensive diagnostic suite opens a window into the shape characteristics of ignition shots and how symmetry affects ICF implosion performance. In more recent ignition shots, neutron yields have visibly increased. Analyzing the shape and size of the reconstructed neutron source has shown an expansion of the burn volume, which is indicative of more efficient alpha heating during the implosion process.; (© 2024 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International (CC BY-NC-ND) license (https://creativecommons.org/licenses/by-nc-nd/4.0/).) |
| Entry Date(s): | Date Created: 20240919 Latest Revision: 20240919 |
| Update Code: | 20260130 |
| DOI: | 10.1063/5.0219550 |
| PMID: | 39297760 |
| Database: | MEDLINE |
Journal Article