Bright betatron radiation from direct-laser-accelerated electrons at moderate relativistic laser intensity
| Autor: | Alexander Pukhov, S. Zähter, N.G. Borisenko, Luca Antonelli, Nikolay Andreev, M. Gyrdymov, O. N. Rosmej, V. S. Popov, F. Barbato, M. M. Günther, X. F. Shen |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Nuclear and High Energy Physics
Photon Synchrotron radiation FOS: Physical sciences Electron QC770-798 Photon energy Radiation law.invention law Nuclear and particle physics. Atomic energy. Radioactivity ddc:530 Electrical and Electronic Engineering X-ray phase contrast imaging Plasma acceleration Betatrons Physics Plasma acceleration Betatrons Plasma Betatron Laser Atomic and Molecular Physics and Optics Physics - Plasma Physics Plasma Physics (physics.plasm-ph) Nuclear Energy and Engineering Atomic physics X-ray phase contrast imaging |
| Zdroj: | Matter and Radiation at Extremes, Vol 6, Iss 4, Pp 048401-048401-8 (2021) Matter and radiation at extremes 6(4), 048401 (2021). doi:10.1063/5.0042315 |
| DOI: | 10.1063/5.0042315 |
| Popis: | Direct laser acceleration (DLA) of electrons in a plasma of near critical electron density (NCD) and associated synchrotron-like radiation are discussed for moderate relativistic laser intensity (the normalized laser amplitude $a_0$ $\leq$ 4.3) and ps-long pulse. This regime is typical for kJ PW-class laser facilities designed for high energy density research. Currently, in experiments at the PHELX laser it was demonstrated that interaction of 10$^{19}$ W/cm$^{2}$ sub-ps laser pulse with sub-mm long NCD plasma results in generation of high-current well-directed super-ponderomotive electrons with effective temperature that is 10$\times$ higher than the ponderomotive potential [O. Rosmej et al., PPCF 62, 115024 (2020)]. Three-dimensional Particle-In-Cell simulations provided a good agreement with the measured electron energy distribution and were used in the current work to study synchrotron radiation of the DLA accelerated electrons. The resulting x-ray spectrum with a critical energy of 5 keV reveals an ultra-high photon number of 7$\times$10$^{11}$ in the 1-30 keV photon energy range at the focused laser energy of 20 J. Numerical simulations of a betatron x-ray phasecontrast imaging based on the DLA process for the parameters of a PHELIX laser is presented. The results are of interest for applications in high energy density (HED) experiments, which require a picosecond x-ray pulse and a high photon flux. under review at Matter and Radiation at Extremes |
| Databáze: | OpenAIRE |
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