Observation of the Self-Modulation Instability via Time-Resolved Measurements Article Swipe

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Matthias Groß , Johannes Engel , James Good , Holger Huck , Igor Isaev , G. Koss , M. Krasilnikov , Osip Lishilin , Gregor Loisch , Yves Rénier , Tino Rublack , F. Stephan , R. Brinkmann , A. Martínez de la Ossa , Jens Osterhoff , Dmitriy Malyutin , Dieter Richter , Timon Mehrling , M. Khojoyan , C. B. Schroeder , F. Grüner ·

YOU? · · 2018 · Open Access · · DOI: https://doi.org/10.1103/physrevlett.120.144802 · OA: W2796158191

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.