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Aurand, B; Reichwein, L; Schwind, K M; Aktan, E; Cerchez, M; Kaymak, V; Lessmann, L; Prasad, R; Thomas, J; Toncian, T; Khoukaz, A; Pukhov, A; Willi, O
New journal of physics, 03/2022, Volume: 24, Issue: 3Journal Article
Abstract We study the laser-driven acceleration of electrons from overdense hydrogen clusters to energies of up to 13 MeV in laser forward direction and several hundreds of keV in an outer ring-structure. The use of cryogenic hydrogen allows for high repetition-rate operation and examination of the influence of source parameters like temperature and gas flow. The outer ring-structure of accelerated electrons, originating from the interaction, that is robust against the change of laser and target parameters can be observed for low electron densities of ca 3 × 10 16 cm −3 . For higher electron densities, an additional central spot of electrons in the laser forward direction can be observed. Utilizing 3D particle-in-cell simulations, it is revealed that both electron populations mainly stem from ponderomotive scattering.
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