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Abstract
Direct laser acceleration (DLA) of electrons in plasmas of near-critical density (NCD) is a very advancing platform for high-energy PW-class lasers of moderate relativistic intensity supporting Inertial Confinement Fusion research. Experiments conducted at the PHELIX sub-PW Nd:glass laser demonstrated application-promising characteristics of DLA-based radiation and particle sources, such as ultra-high number, high directionality and high conversion efficiency. In this context, the bright synchrotron-like (betatron) radiation of DLA electrons, which arises from the interaction of a sub-ps PHELIX laser pulse with an intensity of 1019 W/cm2 with pre-ionized low-density polymer foam, was studied. The experimental results show that the betatron radiation produced by DLA electrons in NCD plasma is well directed with a half-angle of 100–200 mrad, yielding (3.4 ± 0.4)·1010 photons/keV/sr at 10 keV photon energy. The experimental photon fluence and the brilliance agree well with the particle-in-cell simulations. These results pave the way for innovative applications of the DLA regime using low-density pre-ionized foams in high energy density research.
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1 Goethe University Frankfurt, Institute for Applied Physics (IAP), Frankfurt am Main, Germany (GRID:grid.7839.5) (ISNI:0000 0004 1936 9721)
2 Czech Technical University in Prague, Faculty of Electrical Engineering, Prague, Czechia (GRID:grid.6652.7) (ISNI:0000 0001 2173 8213)
3 Goethe University Frankfurt, Institute for Applied Physics (IAP), Frankfurt am Main, Germany (GRID:grid.7839.5) (ISNI:0000 0004 1936 9721); Friedrich Schiller University Jena, Institute of Optics and Quantum Electronics (IOQ), Jena, Germany (GRID:grid.9613.d) (ISNI:0000 0001 1939 2794)
4 Russian Academy of Sciences, P. N. Lebedev Physical Institute (LPI), Moscow, Russia (GRID:grid.4886.2) (ISNI:0000 0001 2192 9124)
5 Xi’an Jiaotong University, MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi’an, China (GRID:grid.43169.39) (ISNI:0000 0001 0599 1243)
6 China Academy of Engineering Physics, Science and Technology On Plasma Physics Laboratory, Laser Fusion Research Center, Mianyang, China (GRID:grid.249079.1) (ISNI:0000 0004 0369 4132)
7 Chinese Academy of Sciences, Institute of Modern Physics, Lanzhou, China (GRID:grid.9227.e) (ISNI:0000000119573309)
8 Peking University, Center for Applied Physics and Technology, HEDPS, and SKLNPT, School of Physics, Beijing, China (GRID:grid.11135.37) (ISNI:0000 0001 2256 9319)
9 Heinrich-Heine-Universität Düsseldorf, Institut für Theoretische Physik I, Düsseldorf, Germany (GRID:grid.411327.2) (ISNI:0000 0001 2176 9917)
10 Friedrich Schiller University Jena, Institute of Optics and Quantum Electronics (IOQ), Jena, Germany (GRID:grid.9613.d) (ISNI:0000 0001 1939 2794)
11 Russian Academy of Sciences, Joint Institute for High Temperatures, Moscow, Russia (GRID:grid.4886.2) (ISNI:0000 0001 2192 9124); Moscow Institute of Physics and Technology (State University), Dolgoprudny, Russia (GRID:grid.18763.3b) (ISNI:0000 0000 9272 1542)
12 Russian Academy of Sciences, Joint Institute for High Temperatures, Moscow, Russia (GRID:grid.4886.2) (ISNI:0000 0001 2192 9124)
13 Goethe University Frankfurt, Institute for Applied Physics (IAP), Frankfurt am Main, Germany (GRID:grid.7839.5) (ISNI:0000 0004 1936 9721); GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany (GRID:grid.159791.2) (ISNI:0000 0000 9127 4365); Helmholtz Forschungsakademie Hessen für FAIR, Frankfurt am Main, Germany (GRID:grid.159791.2)