Interaction of relativistically intense laser pulses with long-scale near critical plasmas for optimization of laser based sources of MeV electrons and gamma-rays
| العنوان: | Interaction of relativistically intense laser pulses with long-scale near critical plasmas for optimization of laser based sources of MeV electrons and gamma-rays |
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| المؤلفون: | Rosmej, Olga, Andreev, N. E., Horst, F., Borisenko, N. G., Sklizkov, G., Pimenov, V. G., Zaehter, S., Zahn, N., Christ, P., Borm, B., Radon, T., Sokolov, A., Pugachev, L. P., Khaghani, D. |
| المصدر: | New journal of physics 21(4), 043044 (2019). doi:10.1088/1367-2630/ab1047 |
| بيانات النشر: | GSI Helmholtzzentrum fuer Schwerionenforschung, GSI, Darmstadt, 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | ddc:530, Physics - Plasma Physics |
| الوصف: | New journal of physics 21(4), 043044 (2019). doi:10.1088/1367-2630/ab1047 Experiments were performed to study electron acceleration by intense sub-picosecond laser pulses propagating in sub-mm long plasmas of near critical electron density (NCD). Low density foam layers of 300-500 mu m thickness were used as targets. In foams, the NCD-plasma was produced by a mechanism of super-sonic ionization when a well-defined separate ns-pulse was sent onto the foam-target forerunning the relativistic main pulse. The application of sub-mm thick low density foam layers provided a substantial increase of the electron acceleration path in a NCD-plasma compared to the case of freely expanding plasmas created in the interaction of the ns-laser pulse with solid foils. The performed experiments on the electron heating by a 100 J, 750 fs short laser pulse of 2-5 x 10(19) W cm(-2) intensity demonstrated that the effective temperature of supra-thermal electrons increased from 1.5-2 MeV in the case of the relativistic laser interaction with a metallic foil at high laser contrast up to 13 MeV for the laser shots onto the pre-ionized foam. The observed tendency towards a strong increase of the mean electron energy and the number of ultra-relativistic laser-accelerated electrons is reinforced by the results of gamma-yield measurements that showed a 1000-fold increase of the measured doses. The experiment was supported by 3D-PIC and FLUKA simulations, which considered the laser parameters and the geometry of the experimental set-up. Both, measurements and simulations showed a high directionality of the acceleration process, since the strongest increase in the electron energy, charge and corresponding gamma-yield was observed close to the direction of the laser pulse propagation. The charge of super-ponderomotive electrons with energy above 30 MeV reached a very high value of 78 nC. Published by IOP25645, [London] |
| اللغة: | English |
| تدمد: | 1367-2630 |
| DOI: | 10.15120/gsi-2019-00639 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e0d8a0f6509942e19e241bae33d63333 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....e0d8a0f6509942e19e241bae33d63333 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13672630 |
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| DOI: | 10.15120/gsi-2019-00639 |