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

(AWAKE Collaboration)

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number164802
JournalPhysical Review Letters
Volume126
Issue number16
DOIs
Publication statusPublished - 20 Apr 2021

OECD FOS+WOS

  • 1.03 PHYSICAL SCIENCES AND ASTRONOMY

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