Focussing Protons from a Kilojoule Laser for Intense Beam Heating using Proximal Target Structures

Abstract Proton beams driven by chirped pulse amplified lasers have multi-picosecond duration and can isochorically and volumetrically heat material samples, potentially providing an approach for creating samples of warm dense matter with conditions not present on Earth. Envisioned on a larger scale...

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Autores principales:	C. McGuffey, J. Kim, M. S. Wei, P. M. Nilson, S. N. Chen, J. Fuchs, P. Fitzsimmons, M. E. Foord, D. Mariscal, H. S. McLean, P. K. Patel, R. B. Stephens, F. N. Beg
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/bf4b28e936514d54ba9f5783abd8079e
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spelling	oai:doaj.org-article:bf4b28e936514d54ba9f5783abd8079e2021-12-02T17:52:13ZFocussing Protons from a Kilojoule Laser for Intense Beam Heating using Proximal Target Structures10.1038/s41598-020-65554-42045-2322https://doaj.org/article/bf4b28e936514d54ba9f5783abd8079e2020-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-65554-4https://doaj.org/toc/2045-2322Abstract Proton beams driven by chirped pulse amplified lasers have multi-picosecond duration and can isochorically and volumetrically heat material samples, potentially providing an approach for creating samples of warm dense matter with conditions not present on Earth. Envisioned on a larger scale, they could heat fusion fuel to achieve ignition. We have shown in an experiment that a kilojoule-class, multi-picosecond short pulse laser is particularly effective for heating materials. The proton beam can be focussed via target design to achieve exceptionally high flux, important for the applications mentioned. The laser irradiated spherically curved diamond-like-carbon targets with intensity 4 × 1018 W/cm 2, producing proton beams with 3 MeV slope temperature. A Cu witness foil was positioned behind the curved target, and the gap between was either empty or spanned with a structure. With a structured target, the total emission of Cu Kα fluorescence was increased 18 fold and the emission profile was consistent with a tightly focussed beam. Transverse proton radiography probed the target with ps order temporal and 10 μm spatial resolution, revealing the fast-acting focussing electric field. Complementary particle-in-cell simulations show how the structures funnel protons to the tight focus. The beam of protons and neutralizing electrons induce the bright Kα emission observed and heat the Cu to 100 eV.C. McGuffeyJ. KimM. S. WeiP. M. NilsonS. N. ChenJ. FuchsP. FitzsimmonsM. E. FoordD. MariscalH. S. McLeanP. K. PatelR. B. StephensF. N. BegNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-10 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q C. McGuffey J. Kim M. S. Wei P. M. Nilson S. N. Chen J. Fuchs P. Fitzsimmons M. E. Foord D. Mariscal H. S. McLean P. K. Patel R. B. Stephens F. N. Beg Focussing Protons from a Kilojoule Laser for Intense Beam Heating using Proximal Target Structures
description	Abstract Proton beams driven by chirped pulse amplified lasers have multi-picosecond duration and can isochorically and volumetrically heat material samples, potentially providing an approach for creating samples of warm dense matter with conditions not present on Earth. Envisioned on a larger scale, they could heat fusion fuel to achieve ignition. We have shown in an experiment that a kilojoule-class, multi-picosecond short pulse laser is particularly effective for heating materials. The proton beam can be focussed via target design to achieve exceptionally high flux, important for the applications mentioned. The laser irradiated spherically curved diamond-like-carbon targets with intensity 4 × 1018 W/cm 2, producing proton beams with 3 MeV slope temperature. A Cu witness foil was positioned behind the curved target, and the gap between was either empty or spanned with a structure. With a structured target, the total emission of Cu Kα fluorescence was increased 18 fold and the emission profile was consistent with a tightly focussed beam. Transverse proton radiography probed the target with ps order temporal and 10 μm spatial resolution, revealing the fast-acting focussing electric field. Complementary particle-in-cell simulations show how the structures funnel protons to the tight focus. The beam of protons and neutralizing electrons induce the bright Kα emission observed and heat the Cu to 100 eV.
format	article
author	C. McGuffey J. Kim M. S. Wei P. M. Nilson S. N. Chen J. Fuchs P. Fitzsimmons M. E. Foord D. Mariscal H. S. McLean P. K. Patel R. B. Stephens F. N. Beg
author_facet	C. McGuffey J. Kim M. S. Wei P. M. Nilson S. N. Chen J. Fuchs P. Fitzsimmons M. E. Foord D. Mariscal H. S. McLean P. K. Patel R. B. Stephens F. N. Beg
author_sort	C. McGuffey
title	Focussing Protons from a Kilojoule Laser for Intense Beam Heating using Proximal Target Structures
title_short	Focussing Protons from a Kilojoule Laser for Intense Beam Heating using Proximal Target Structures
title_full	Focussing Protons from a Kilojoule Laser for Intense Beam Heating using Proximal Target Structures
title_fullStr	Focussing Protons from a Kilojoule Laser for Intense Beam Heating using Proximal Target Structures
title_full_unstemmed	Focussing Protons from a Kilojoule Laser for Intense Beam Heating using Proximal Target Structures
title_sort	focussing protons from a kilojoule laser for intense beam heating using proximal target structures
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/bf4b28e936514d54ba9f5783abd8079e
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Focussing Protons from a Kilojoule Laser for Intense Beam Heating using Proximal Target Structures

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