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Anomalous material-dependent transport of focused, laser-driven proton beams
Intense lasers can accelerate protons in sufficient numbers and energy that the resulting beam can heat materials to exotic warm (10 s of eV temperature) states. Here we show with experimental data that a laser-driven proton beam focused onto a target heated it in a localized spot with size strongly...
Autores principales: | , , , , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6277378/ https://www.ncbi.nlm.nih.gov/pubmed/30510273 http://dx.doi.org/10.1038/s41598-018-36106-8 |
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author | Kim, J. McGuffey, C. Gautier, D. C. Link, A. Kemp, G. E. Giraldez, E. M. Wei, M. S. Stephens, R. B. Kerr, S. Poole, P. L. Madden, R. Qiao, B. Foord, M. E. Ping, Y. McLean, H. S. Fernández, J. C. Beg, F. N. |
author_facet | Kim, J. McGuffey, C. Gautier, D. C. Link, A. Kemp, G. E. Giraldez, E. M. Wei, M. S. Stephens, R. B. Kerr, S. Poole, P. L. Madden, R. Qiao, B. Foord, M. E. Ping, Y. McLean, H. S. Fernández, J. C. Beg, F. N. |
author_sort | Kim, J. |
collection | PubMed |
description | Intense lasers can accelerate protons in sufficient numbers and energy that the resulting beam can heat materials to exotic warm (10 s of eV temperature) states. Here we show with experimental data that a laser-driven proton beam focused onto a target heated it in a localized spot with size strongly dependent upon material and as small as 35 μm radius. Simulations indicate that cold stopping power values cannot model the intense proton beam transport in solid targets well enough to match the large differences observed. In the experiment a 74 J, 670 fs laser drove a focusing proton beam that transported through different thicknesses of solid Mylar, Al, Cu or Au, eventually heating a rear, thin, Au witness layer. The XUV emission seen from the rear of the Au indicated a clear dependence of proton beam transport upon atomic number, Z, of the transport layer: a larger and brighter emission spot was measured after proton transport through the lower Z foils even with equal mass density for supposed equivalent proton stopping range. Beam transport dynamics pertaining to the observed heated spot were investigated numerically with a particle-in-cell (PIC) code. In simulations protons moving through an Al transport layer result in higher Au temperature responsible for higher Au radiant emittance compared to a Cu transport case. The inferred finding that proton stopping varies with temperature in different materials, considerably changing the beam heating profile, can guide applications seeking to controllably heat targets with intense proton beams. |
format | Online Article Text |
id | pubmed-6277378 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-62773782018-12-06 Anomalous material-dependent transport of focused, laser-driven proton beams Kim, J. McGuffey, C. Gautier, D. C. Link, A. Kemp, G. E. Giraldez, E. M. Wei, M. S. Stephens, R. B. Kerr, S. Poole, P. L. Madden, R. Qiao, B. Foord, M. E. Ping, Y. McLean, H. S. Fernández, J. C. Beg, F. N. Sci Rep Article Intense lasers can accelerate protons in sufficient numbers and energy that the resulting beam can heat materials to exotic warm (10 s of eV temperature) states. Here we show with experimental data that a laser-driven proton beam focused onto a target heated it in a localized spot with size strongly dependent upon material and as small as 35 μm radius. Simulations indicate that cold stopping power values cannot model the intense proton beam transport in solid targets well enough to match the large differences observed. In the experiment a 74 J, 670 fs laser drove a focusing proton beam that transported through different thicknesses of solid Mylar, Al, Cu or Au, eventually heating a rear, thin, Au witness layer. The XUV emission seen from the rear of the Au indicated a clear dependence of proton beam transport upon atomic number, Z, of the transport layer: a larger and brighter emission spot was measured after proton transport through the lower Z foils even with equal mass density for supposed equivalent proton stopping range. Beam transport dynamics pertaining to the observed heated spot were investigated numerically with a particle-in-cell (PIC) code. In simulations protons moving through an Al transport layer result in higher Au temperature responsible for higher Au radiant emittance compared to a Cu transport case. The inferred finding that proton stopping varies with temperature in different materials, considerably changing the beam heating profile, can guide applications seeking to controllably heat targets with intense proton beams. Nature Publishing Group UK 2018-12-03 /pmc/articles/PMC6277378/ /pubmed/30510273 http://dx.doi.org/10.1038/s41598-018-36106-8 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Kim, J. McGuffey, C. Gautier, D. C. Link, A. Kemp, G. E. Giraldez, E. M. Wei, M. S. Stephens, R. B. Kerr, S. Poole, P. L. Madden, R. Qiao, B. Foord, M. E. Ping, Y. McLean, H. S. Fernández, J. C. Beg, F. N. Anomalous material-dependent transport of focused, laser-driven proton beams |
title | Anomalous material-dependent transport of focused, laser-driven proton beams |
title_full | Anomalous material-dependent transport of focused, laser-driven proton beams |
title_fullStr | Anomalous material-dependent transport of focused, laser-driven proton beams |
title_full_unstemmed | Anomalous material-dependent transport of focused, laser-driven proton beams |
title_short | Anomalous material-dependent transport of focused, laser-driven proton beams |
title_sort | anomalous material-dependent transport of focused, laser-driven proton beams |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6277378/ https://www.ncbi.nlm.nih.gov/pubmed/30510273 http://dx.doi.org/10.1038/s41598-018-36106-8 |
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