Experimental observation of plasma wakefield growth driven by the seeded 
self-modulation of a proton bunch

AWAKE Collaboration,; Turner, M.

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Experimental observation of plasma wakefield growth driven by the seeded self-modulation of a proton bunch

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AWAKE Collaboration,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Turner, M.
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

AWAKE Collaboration, & Turner, M. (2019). Experimental observation of plasma wakefield growth driven by the seeded self-modulation of a proton bunch. Physical Review Letters, 122, 054801. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2018-344.

Cite as: https://hdl.handle.net/21.11116/0000-0005-D67B-0

Abstract

We measure the effects of transverse wakefields driven by a relativistic proton bunch in plasma with densities of $2.1\times10^{14}$ and \unit[$7.7\times10^{14}$]{electrons/cm$^3$}. We show that these wakefields periodically defocus the proton bunch itself, consistently with the development of the seeded self-modulation process. We show that the defocusing increases both along the bunch and along the plasma by using time resolved and time-integrated measurements of the proton bunch transverse distribution. We evaluate the transverse wakefield amplitudes and show that they exceed their seed value (\unit[$<$15]{MV/m}) and reach over \unit[300]{MV/m}. All these results confirm the development of the seeded self-modulation process, a necessary condition for external injection of low energy and acceleration of electrons to multi-GeV energy levels.