Bright betatron radiation from direct-laser-accelerated electrons at moderate relativistic laser intensity
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2021
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| author | Rosmej, O. N. Shen, X. F. Pukhov, A. Antonelli, L. Barbato, F. Gyrdymov, M. Günther, M. M. Zähter, S. Popov, V. S. Borisenko, N. G. Andreev, N. E. |
| author_facet | Rosmej, O. N. Shen, X. F. Pukhov, A. Antonelli, L. Barbato, F. Gyrdymov, M. Günther, M. M. Zähter, S. Popov, V. S. Borisenko, N. G. Andreev, N. E. |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2104_11623 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Bright betatron radiation from direct-laser-accelerated electrons at moderate relativistic laser intensity Rosmej, O. N. Shen, X. F. Pukhov, A. Antonelli, L. Barbato, F. Gyrdymov, M. Günther, M. M. Zähter, S. Popov, V. S. Borisenko, N. G. Andreev, N. E. Plasma Physics 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. |
| title | Bright betatron radiation from direct-laser-accelerated electrons at moderate relativistic laser intensity |
| topic | Plasma Physics |
| url | https://arxiv.org/abs/2104.11623 |