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

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...

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Bibliographic Details
Published in:Physical review letters 2018-04, Vol.120 (14), p.144802-144802, Article 144802
Main Authors: 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, C B, Grüner, F
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Accelerator Physics
Electron beams
Modulation
PARTICLE ACCELERATORS
Physics
Plasma
plasma acceleration & new acceleration techniques
plasma-beam interactions
Wave propagation
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.120.144802