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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2025, Volume 121, Issue 7, Pages 562–571
DOI: https://doi.org/10.31857/S0370274X25040052 (Mi jetpl7480) 		 
OPTICS AND NUCLEAR PHYSICS

Influence of the focus position on preplasma formation and ion acceleration in laser irradiation of a flat target

K. V. Safronova, A. V. Brantovb, V. A. Flegentova, N. N. Shamaevaa, S. A. Gorokhova, A. S. Tishchenkoa, D. O. Zamuraeva, N. A. Fedorova, S. F. Kovalevaa, A. L. Shamraevb, S. I. Glazyrincb, M. A. Rakitinab, V. Yu. Bychenkovcb

a Russian Federal Nuclear Center Zababakhin All-Russia Research Institute of Technical Physics, Snezhinsk, Chelyabinsk region, 456770 Russia
b Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991 Russia
c Dukhov Automatics Research Institute, Moscow, 127030 Russia
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DOI: https://doi.org/10.31857/S0370274X25040052
Abstract: It has been demonstrated experimentally and in the theoretical calculation that the energy of protons accelerated by a 60-TW femtosecond laser pulse can be increased by choosing the optimal position of the focus spot relative to the surface of the irradiated target at a given nanosecond pedestal due to amplified spontaneous emission. This position is determined as the best focusing option that ensures a sufficiently efficient matching of incident and preplasma-trapped laser radiation under the conditions of emerging self-consistent spatial profiles of the preplasma and crater (i.e., the remaining thickness of the target) on the irradiated surface. At the same time, the focal spot does not lie on the surface of the target, but is shifted into the preplasma, which makes it possible to raise the maximum proton energy by a factor of 1.5.
Funding agency Grant number
Russian Science Foundation 24-22-00119
This work in the part of the simulation of the target expansion and proton acceleration from targets with the preplasma was supported by the Russian Science Foundation (project no. 24-22-00119, https://rscf.ru/project/24-22-00119/).
Received: 27.01.2025
Revised: 03.03.2025
Accepted: 04.03.2025
English version:
Journal of Experimental and Theoretical Physics Letters, 2025, Volume 121, Issue 7, Pages 536–544
DOI: https://doi.org/10.1134/S002136402560020X
Bibliographic databases:
Document Type: Article
Language: Russian
Citation: K. V. Safronov, A. V. Brantov, V. A. Flegentov, N. N. Shamaeva, S. A. Gorokhov, A. S. Tishchenko, D. O. Zamuraev, N. A. Fedorov, S. F. Kovaleva, A. L. Shamraev, S. I. Glazyrin, M. A. Rakitina, V. Yu. Bychenkov, “Influence of the focus position on preplasma formation and ion acceleration in laser irradiation of a flat target”, Pis'ma v Zh. Èksper. Teoret. Fiz., 121:7 (2025), 562–571; JETP Letters, 121:7 (2025), 536–544
Citation in format AMSBIB
\Bibitem{SafBraFle25}
\by K.~V.~Safronov, A.~V.~Brantov, V.~A.~Flegentov, N.~N.~Shamaeva, S.~A.~Gorokhov, A.~S.~Tishchenko, D.~O.~Zamuraev, N.~A.~Fedorov, S.~F.~Kovaleva, A.~L.~Shamraev, S.~I.~Glazyrin, M.~A.~Rakitina, V.~Yu.~Bychenkov
\paper Influence of the focus position on preplasma formation and ion acceleration in laser irradiation of a flat target
\jour Pis'ma v Zh. \`Eksper. Teoret. Fiz.
\yr 2025
\vol 121
\issue 7
\pages 562--571
\mathnet{http://mi.mathnet.ru/jetpl7480}
\edn{https://elibrary.ru/LMOHZO}
\transl
\jour JETP Letters
\yr 2025
\vol 121
\issue 7
\pages 536--544
\crossref{https://doi.org/10.1134/S002136402560020X}
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