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@ARTICLE{Reichwein:902839,
      author       = {Reichwein, L. and Hützen, A. and Büscher, M. and Pukhov,
                      A.},
      title        = {{O}n the robustness of spin polarization for magnetic
                      vortex accelerated proton bunches in density down-ramps},
      journal      = {Plasma physics and controlled fusion},
      volume       = {63},
      number       = {8},
      issn         = {0032-1028},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2021-04596},
      pages        = {085011 -},
      year         = {2021},
      abstract     = {We investigate the effect of density down-ramps on the
                      acceleration of ions via magnetic vortex acceleration in a
                      near-critical density gas target by means of
                      particle-in-cell simulations. The spin-polarization of the
                      accelerated protons is robust for a variety of ramp lengths
                      at around $80\%.$ Significant increase of the ramp length is
                      accompanied by collimation of low-polarization protons into
                      the final beam and large transverse spread of the highly
                      polarized protons with respect to the direction of laser
                      propagation.},
      cin          = {PGI-6},
      ddc          = {620},
      cid          = {I:(DE-Juel1)PGI-6-20110106},
      pnm          = {621 - Accelerator Research and Development (POF4-621)},
      pid          = {G:(DE-HGF)POF4-621},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000667469400001},
      doi          = {10.1088/1361-6587/ac0614},
      url          = {https://juser.fz-juelich.de/record/902839},
}