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Effect of small focus on electron heating and proton acceleration in ultrarelativistic laser-solid interactions

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Title: Effect of small focus on electron heating and proton acceleration in ultrarelativistic laser-solid interactions
Authors: Dover, NP
Nishiuchi, M
Sakaki, H
Kondo, K
Alkhimova, MA
Faenov, AY
Hata, M
Iwata, N
Kiriyama, H
Koga, JK
Miyahara, T
Pikuz, TA
Pirozhkov, AS
Sagisaka, A
Sentoku, Y
Watanabe, Y
Kando, M
Kondo, K
Item Type: Journal Article
Abstract: Acceleration of particles from the interaction of ultraintense laser pulses up to 5 × 10 21     W   cm − 2 with thin foils is investigated experimentally. The electron beam parameters varied with decreasing spot size, not just laser intensity, resulting in reduced temperatures and divergence. In particular, the temperature saturated due to insufficient acceleration length in the tightly focused spot. These dependencies affected the sheath-accelerated protons, which showed poorer spot-size scaling than widely used scaling laws. It is therefore shown that maximizing laser intensity by using very small foci has reducing returns for some applications.
Issue Date: 26-Feb-2020
Date of Acceptance: 18-Dec-2019
URI: http://hdl.handle.net/10044/1/84534
DOI: 10.1103/physrevlett.124.084802
ISSN: 0031-9007
Publisher: American Physical Society (APS)
Start Page: 084802 – 1
End Page: 084802 – 7
Journal / Book Title: Physical Review Letters
Volume: 124
Issue: 8
Copyright Statement: © 2020 The Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
Keywords: General Physics
01 Mathematical Sciences
02 Physical Sciences
09 Engineering
Publication Status: Published online
Open Access location: https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.124.084802
Article Number: 084802
Online Publication Date: 2020-02-26
Appears in Collections:Physics
Plasma Physics

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