Hot spots and dark current in advanced plasma wakefield accelerators

G. G. Manahan, A. Deng, O. Karger, Y. Xi, A. Knetsch, M. Litos, G. Wittig, T. Heinemann, J. Smith, Z. M. Sheng, D. A. Jaroszynski, G. Andonian, D. L. Bruhwiler, J. B. Rosenzweig, B. Hidding

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Dark current can spoil witness bunch beam quality and acceleration efficiency in particle beam-driven plasma wakefield accelerators. In advanced schemes, hot spots generated by the drive beam or the wakefield can release electrons from higher ionization threshold levels in the plasma media. These electrons may be trapped inside the plasma wake and will then accumulate dark current, which is generally detrimental for a clear and unspoiled plasma acceleration process. Strategies for generating clean and robust, dark current free plasma wake cavities are devised and analyzed, and crucial aspects for experimental realization of such optimized scenarios are discussed.
Original languageEnglish
Article number011303
Number of pages9
JournalPhysical Review Special Topics: Accelerators and Beams
Issue number1
Publication statusPublished - 29 Jan 2016


  • dark current
  • plasma wakefield
  • plasma wakefield acceleration
  • hot spots

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