Multi-proton bunch driven hollow plasma wakefield acceleration in the nonlinear regime

TL;DR

This paper proposes a novel hollow plasma channel method for resonant, nonlinear regime proton-driven wakefield acceleration, enhancing beam quality and stability for future high-energy particle accelerators.

Contribution

It introduces a new regime using hollow channels that enables resonant excitation of plasma waves with multiple proton micro-bunches, improving acceleration efficiency and beam quality.

Findings

Resonant excitation of strong plasma waves demonstrated.

Hollow channels preserve emittance and provide uniform acceleration.

Stable long deceleration buckets for drive beams achieved.

Abstract

Proton-driven plasma wakefield acceleration has been demonstrated in simulations to be capable of accelerating particles to the energy frontier in a single stage, but its potential is hindered by the fact that currently available proton bunches are orders of magnitude longer than the plasma wavelength. Fortunately, proton micro-bunching allows driving plasma waves resonantly. In this paper, we propose using a hollow plasma channel for multiple proton bunch driven plasma wakefield acceleration and demonstrate that it enables the operation in the nonlinear regime and resonant excitation of strong plasma waves. This new regime also involves beneficial features of hollow channels for the accelerated beam (such as emittance preservation and uniform accelerating field) and long buckets of stable deceleration for the drive beam. The regime is attained at a proper ratio among plasma skin depth, driver radius, hollow channel radius, and micro-bunch period.