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

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 ($\ge (4.1\pm 0.4)$ MV/m), the phase of the modulation along the bunch is reproducible from event to event, with 3 to 7% (of 2$\pi$) 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.

arXiv commentLetter and Supplemental Material, 6 figures, 8 pages

References in corpus (16)

• Acceleration of electrons in the plasma wakefield of a proton bunch
• Self-modulation instability of a long proton bunch in plasmas
• AWAKE, The Advanced Proton Driven Plasma Wakefield Acceleration Experiment at CERN
• Experimental observation of proton bunch modulation in a plasma, at varying plasma densities
• Experimental observation of plasma wakefield growth driven by the seeded self-modulation of a proton bunch
• AWAKE readiness for the study of the seeded self-modulation of a 400\,GeV proton bunch
• A Rubidium Vapor Source for a Plasma Source for AWAKE
• Emittance preservation of an electron beam in a loaded quasi-linear plasma wakefield
• Natural noise and external wake field seeding in a proton-driven plasma accelerator
• Physics to plan AWAKE Run 2
• Interferometer-based high-accuracy white light measurement of neutral rubidium density and gradient at AWAKE
• Experimental Study of Wakefields Driven by a Self-Modulating Proton Bunch in Plasma
• Proton Driven Plasma Wakefield Acceleration in AWAKE
• Setup and Characteristics of a Timing Reference Signal with sub-ps Accuracy for AWAKE
• Determination of the Charge per Micro-Bunch of a Self-Modulated Proton Bunch using a Streak Camera
• Evolution of a plasma column measured through modulation of a high-energy proton beam

Cited by in corpus (5)

• Controlled Growth of the Self-Modulation of a Relativistic Proton Bunch in Plasma
• Witness electron beam injection using an active plasma lens for a proton beam-driven plasma wakefield accelerator
• Mitigation of the onset of hosing in the linear regime through plasma frequency detuning
• Simulation and Experimental Study of Proton Bunch Self-Modulation in Plasma with Linear Density Gradients
• Analysis of Proton Bunch Parameters in the AWAKE Experiment