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Transition between Instability and Seeded Self-Modulation of a Relativistic Particle Bunch in Plasma

F. Batsch et al. (AWAKE Collaboration)
Phys. Rev. Lett. 126, 164802 – Published 20 April 2021
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Abstract

We use a relativistic ionization front to provide various initial transverse wakefield amplitudes for the self-modulation of a long proton bunch in plasma. We show experimentally that, with sufficient initial amplitude [(4.1±0.4)MV/m], the phase of the modulation along the bunch is reproducible from event to event, with 3%–7% (of 2π) rms variations all along the bunch. The phase is not reproducible for lower initial amplitudes. We observe the transition between these two regimes. Phase reproducibility is essential for deterministic external injection of particles to be accelerated.

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  • Received 18 December 2020
  • Revised 18 February 2021
  • Accepted 9 March 2021

DOI:https://doi.org/10.1103/PhysRevLett.126.164802

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Plasma PhysicsAccelerators & Beams

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Issue

Vol. 126, Iss. 16 — 23 April 2021

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