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@ARTICLE{DiLucchio:890807,
      author       = {Di Lucchio, Laura and Gibbon, Paul},
      title        = {{P}ost-acceleration of electron bunches from
                      laser-irradiated nanoclusters},
      journal      = {Physica scripta},
      volume       = {96},
      issn         = {1402-4896},
      address      = {Stockholm},
      publisher    = {The Royal Swedish Academy of Sciences},
      reportid     = {FZJ-2021-01215},
      pages        = {055603},
      year         = {2021},
      abstract     = {In this paper the energy gain of attosecond electron
                      bunches emitted during the interaction of intense, few-cycle
                      linearly polarized lasers with nanoscale spherical clusters
                      is determined. In this case electron bunches are emitted
                      from the rear side of the cluster and are then further
                      accelerated while co-propagating with the laser. A previous
                      study has shown how this two-stage process readily occurs
                      for clusters whose radii lie between the relativistic skin
                      depth, δr = γ1/2c/ωp, and the laser spot size σL (Di
                      Lucchio $\&$ Gibbon, Phys. Rev. STAB 18, 2015). An
                      analytical model for focused light waves interacting with
                      compact, overdense electron bunches in vacuum is derived
                      heuristically from world-line equations of motion of an
                      electron. The functional integral approach is followed under
                      the mathematical point of view of integration with respect
                      to a stochastic variable. The resulting picture of the laser
                      wave crossing the electron's trajectory leads to a finite
                      energy gain of the electron in light–matter interaction in
                      vacuum. The analytical theory is compared with
                      three-dimensional PIC simulations from which trajectories of
                      the electron bunches can be extracted. The effective
                      increase in bunch energy is determined under realistic
                      conditions both for the peak (mode) and the cutoff energy of
                      the emitted bunch, in order to make quantitative comparisons
                      with theory and the experimental findings of Cardenas et al
                      , Nature Sci. Reports 9 (2019).},
      cin          = {JSC},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JSC-20090406},
      pnm          = {5111 - Domain-Specific Simulation $\&$ Data Life Cycle Labs
                      (SDLs) and Research Groups (POF4-511)},
      pid          = {G:(DE-HGF)POF4-5111},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000627292700001},
      doi          = {10.1088/1402-4896/abe77f},
      url          = {https://juser.fz-juelich.de/record/890807},
}