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Hussein, A E; Arefiev, A V; Batson, T; Chen, H; Craxton, R S; Davies, A S; Froula, D H; Gong, Z; Haberberger, D; Ma, Y; Nilson, P M; Theobald, W; Wang, T; Weichman, K; Williams, G J; Willingale, L
New journal of physics, 02/2021, Letnik: 23, Številka: 2Journal Article
Abstract Experimental measurements using the OMEGA EP laser facility demonstrated direct laser acceleration (DLA) of electron beams to (505 ± 75) MeV with (140 ± 30) nC of charge from a low-density plasma target using a 400 J, picosecond duration pulse. Similar trends of electron energy with target density are also observed in self-consistent two-dimensional particle-in-cell simulations. The intensity of the laser pulse is sufficiently large that the electrons are rapidly expelled along the laser pulse propagation axis to form a channel. The dominant acceleration mechanism is confirmed to be DLA and the effect of quasi-static channel fields on energetic electron dynamics is examined. A strong channel magnetic field, self-generated by the accelerated electrons, is found to play a comparable role to the transverse electric channel field in defining the boundary of electron motion.
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