Gas-dynamic density downramp injection in a beam-driven plasma wakefield accelerator

J. P. Couperus Cabadağ, R. Pausch, S. Schöbel, M. Bussmann, Y. Y. Chang, S. Corde, A. Debus, H. Ding, A. Döpp, F. M. Foerster, M. Gilljohann, F. Haberstroh, T. Heinemann, B. Hidding, S. Karsch, A. Koehler, O. Kononenko, A. Knetsch, T. Kurz, A. Martinez de la OssaA. Nutter, G. Raj, K. Steiniger, U. Schramm, P. Ufer, A. Irman

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We present the experimental demonstration of density downramp injection at a gas-dynamic shock in a beam-driven plasma accelerator. The ultrashort driver electron beam with a peak-current exceeding 10 kA allows operation in the blowout regime and enables injection of electron witness bunches at gentle density ramps, i.e., longer than the plasma wavelength, which nurtures prospects for ultralow bunch emittance. By precision control over the position of injection we show that these bunches can be energy-tuned in acceleration gradients of near 120 GV.

Original languageEnglish
Article numberL042005
Number of pages9
JournalPhysical Review Research
Issue number4
Publication statusPublished - 15 Oct 2021


  • accelerators
  • plasma physics
  • laser wakefield acceleration
  • plasma acceleration and new acceleration techniques
  • plasma-beam interactions
  • particle-in-cell methods


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