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Bright betatron radiation from direct-laser-accelerated electrons at moderate relativistic laser intensity

  • Direct laser acceleration (DLA) of electrons in a plasma of near-critical electron density (NCD) and the associated synchrotron-like radiation are discussed for moderate relativistic laser intensity (normalized laser amplitude a0 ≤ 4.3) and ps length pulse. This regime is typical of kJ PW-class laser facilities designed for high-energy-density (HED) research. In experiments at the PHELIX facility, it has been demonstrated that interaction of a 1019 W/cm2 sub-ps laser pulse with a sub-mm length NCD plasma results in the generation of high-current well-directed super-ponderomotive electrons with an effective temperature ten times higher than the ponderomotive potential [Rosmej et al., Plasma Phys. Controlled Fusion 62, 115024 (2020)]. Three-dimensional particle-in-cell simulations provide good agreement with the measured electron energy distribution and are used in the current work to study synchrotron radiation from the DLA-accelerated electrons. The resulting x-ray spectrum with a critical energy of 5 keV reveals an ultrahigh photon number of 7 × 1011 in the 1–30 keV photon energy range at the focused laser energy of 20 J. Numerical simulations of betatron x-ray phase contrast imaging based on the DLA process for the parameters of a PHELIX laser are presented. The results are of interest for applications in HED experiments, which require a ps x-ray pulse and a high photon flux.

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Author:Olga N. RosmejORCiD, Xiaofei ShenORCiDGND, Alexander PukhovORCiDGND, Luca AntonelliORCiD, Francesco BarbatoORCiDGND, Mikhail GyrdymovORCiD, Marc M. GüntherGND, Şêro Jakob ZähterORCiDGND, Vyacheslav S. Popov, Nataliya G. Borisenko, Nikolay E. AndreevORCiD
URN:urn:nbn:de:hebis:30:3-628223
DOI:https://doi.org/10.1063/5.0042315
ISSN:2468-080X
Parent Title (English):Matter and radiation at extremes
Publisher:AIP Publishing
Place of publication:Melville, NY
Document Type:Article
Language:English
Date of Publication (online):2021/07/09
Date of first Publication:2021/07/09
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2023/03/24
Tag:Betatrons; Plasma acceleration; X-ray phase contrast imaging
Volume:6
Issue:4, art. 048401
Article Number:048401
Page Number:8
First Page:1
Last Page:8
Note:
This work was also supported by the DFG (Project No. PU 213/9), EPSRC Grant No. EP/P026796/1.
HeBIS-PPN:508919347
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - Namensnennung 4.0