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    All-optical density downramp injection in electron-driven plasma wakefield accelerators

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    Type
    Preprint
    Authors
    Ullmann, D.
    Scherkl, P.
    Knetsch, A.
    Heinemann, T.
    Sutherland, A.
    Habib, A. F.
    Karger, O. S.
    Beaton, A.
    Manahan, G. G.
    Deng, A.
    Andonian, G.
    Litos, M. D.
    OShea, B. D.
    Bruhwiler, D. L.
    Cary, J. R.
    Hogan, M. J.
    Yakimenko, V.
    Rosenzweig, J. B.
    Hidding, B.
    Date
    2020-07-24
    Permanent link to this record
    http://hdl.handle.net/10754/664651
    
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    Abstract
    Injection of well-defined, high-quality electron populations into plasma waves is a key challenge of plasma wakefield accelerators. Here, we report on the first experimental demonstration of plasma density downramp injection in an electron-driven plasma wakefield accelerator, which can be controlled and tuned in all-optical fashion by mJ-level laser pulses. The laser pulse is directed across the path of the plasma wave before its arrival, where it generates a local plasma density spike in addition to the background plasma by tunnelling ionization of a high ionization threshold gas component. This density spike distorts the plasma wave during the density downramp, causing plasma electrons to be injected into the plasma wave. By tuning the laser pulse energy and shape, highly flexible plasma density spike profiles can be designed, enabling dark current free, versatile production of high-quality electron beams. This in turn permits creation of unique injected beam configurations such as counter-oscillating twin beamlets.
    Sponsors
    The FACET E-210 plasma wakefield acceleration experiment was built and operated with support from UCLA (US Department of Energy (DOE) contract no. DESC0009914), RadiaBeam Technologies (DOE contract no. DE-SC0009533), and the FACET E200 team and DOE under contract no. DE-AC02-76SF00515. B.H., P.S., A.S., F.A.H., T.H., A.B. were supported by the European Research Council (ERC) under the European Unions Horizon 2020 research and innovation programme (NeXource, ERC Grant agreement No. 865877). The work was supported by STFC ST/S006214/1 PWFAFEL, EPSRC (grant no. EP/N028694/1). D.L.B. acknowledges support from the US DOE Office of High Energy Physics under award no. DE-SC0013855. J.R.C. acknowledges support from the National Science Foundation under award no. PHY 1734281. M.D.L acknowledges support from the US DOE Office of High Energy Physics under award no. DE-SC0017906. This work used computational resources of the National Energy Research Scientific Computing Center, which is supported by DOE DE-AC02-05CH11231, and of the Supercomputing Laboratory at King Abdullah University of Science & Technology (KAUST) in Thuwal, Saudi Arabia.
    Publisher
    arXiv
    arXiv
    2007.12634
    Additional Links
    https://arxiv.org/pdf/2007.12634
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