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Bin, J H; Yeung, M; Gong, Z; Wang, H Y; Kreuzer, C; Zhou, M L; Streeter, M J V; Foster, P S; Cousens, S; Dromey, B; Meyer-Ter-Vehn, J; Zepf, M; Schreiber, J
Physical review letters, 2018-Feb-16, Volume: 120, Issue: 7Journal Article
We report on the experimental studies of laser driven ion acceleration from a double-layer target where a near-critical density target with a few-micron thickness is coated in front of a nanometer-thin diamondlike carbon foil. A significant enhancement of proton maximum energies from 12 to ∼30 MeV is observed when a relativistic laser pulse impinges on the double-layer target under linear polarization. We attributed the enhanced acceleration to superponderomotive electrons that were simultaneously measured in the experiments with energies far beyond the free-electron ponderomotive limit. Our interpretation is supported by two-dimensional simulation results.
