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Open Access Publications from the University of California

Observation of the Self-Modulation Instability via Time-Resolved Measurements.

  • Author(s): Gross, M
  • Engel, J
  • Good, J
  • Huck, H
  • Isaev, I
  • Koss, G
  • Krasilnikov, M
  • Lishilin, O
  • Loisch, G
  • Renier, Y
  • Rublack, T
  • Stephan, F
  • Brinkmann, R
  • Martinez de la Ossa, A
  • Osterhoff, J
  • Malyutin, D
  • Richter, D
  • Mehrling, T
  • Khojoyan, M
  • Schroeder, CB
  • Grüner, F
  • et al.

Self-modulation of an electron beam in a plasma has been observed. The propagation of a long (several plasma wavelengths) electron bunch in an overdense plasma resulted in the production of multiple bunches via the self-modulation instability. Using a combination of a radio-frequency deflector and a dipole spectrometer, the time and energy structure of the self-modulated beam was measured. The longitudinal phase space measurement showed the modulation of a long electron bunch into three bunches with an approximately 200  keV/c amplitude momentum modulation. Demonstrating this effect is a breakthrough for proton-driven plasma accelerator schemes aiming to utilize the same physical effect.

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