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@INPROCEEDINGS{BjrklundSvensson:485673,
      author       = {Björklund Svensson, Jonas Halfdan and Boulton, Lewis and
                      Garland, Matthew James and Lindstroem, Carl Andreas and Pena
                      Asmus, Felipe Lars and Schröder, Sarah and Wesch, Stephan
                      and Wood, Jonathan Christopher and Osterhoff, Jens and
                      D'Arcy, Richard},
      title        = {{D}irect measurements of emittance growth from {C}oulomb
                      scattering on neutral gas atoms in a plasma lens - {E}fforts
                      towards quantifying fundamentally limiting factors of
                      plasma-based particle-beam optics},
      reportid     = {PUBDB-2022-06760},
      year         = {2022},
      abstract     = {Plasma lenses are of much interest to the
                      plasma-accelerator community as their cylindrically
                      symmetric and large focusing gradients facilitate
                      beam-optics control of the highly divergent beams usually
                      associated with plasma accelerators. However, a fundamental
                      difference between plasma-based and conventional
                      accelerators/focusing devices is that in the former the
                      beams propagate through matter rather than a vacuum. This
                      invariably leads to interactions such as Coulomb scattering
                      between the beam and plasma particles, which in turn likely
                      leads to emittance growth. Whereas the beam sizes inside
                      plasma accelerators are comparatively small, limiting the
                      induced emittance growth, the situation in plasma lenses is
                      quite different as the beam size must be larger in these
                      devices than in the accelerators to allow collimation or
                      focusing. In particular, in active plasma lenses beam sizes
                      must be large to avoid driving a wake, which in turn
                      increases the induced emittance growth from scattering. This
                      is further exacerbated by the fact that using gases of
                      heavier elements, which scatter more strongly than their
                      lighter counterparts, is preferable as they produce linear
                      focusing gradients. However, direct measurements of the
                      induced emittance growth from Coulomb scattering have
                      hitherto not been shown for beam and lens parameters
                      relevant to plasma-based focusing devices. In this work, we
                      show the measurements of emittance growth from scattering in
                      neutral (i.e. un-ionized) argon, nitrogen, and hydrogen over
                      a range of pressures. Results from a corresponding set of
                      simulations in GEANT4 and Ocelot, which represent the
                      experimental environment, are also outlined.},
      month         = {Nov},
      date          = {2022-11-06},
      organization  = {20th Advanced Accelerator Concepts
                       Workshop, Hauppage, NY (USA), 6 Nov
                       2022 - 11 Nov 2022},
      cin          = {$HH_FH_FTX_AS$ / MPA / MPA2},
      cid          = {$I:(DE-H253)HH_FH_FTX_AS-20210421$ /
                      I:(DE-H253)MPA-20200816 / I:(DE-H253)MPA2-20210408},
      pnm          = {621 - Accelerator Research and Development (POF4-621)},
      pid          = {G:(DE-HGF)POF4-621},
      experiment   = {EXP:(DE-H253)FLASHForward-20150101},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://bib-pubdb1.desy.de/record/485673},
}