Increase of amplitude of accelerating wakefield excited by sequence of short relativistic electron bunches in plasma at magnetic field use

TL;DR

This paper demonstrates through numerical simulation that applying a magnetic field in plasma accelerators with sequences of short relativistic electron bunches enhances wakefield amplitude by restoring defocused bunches to the interaction region and increasing wave frequency.

Contribution

The study introduces a novel approach using magnetic fields to sustain electron bunch participation and amplify wakefield excitation in plasma accelerators with sequential bunches.

Findings

Magnetic fields restore defocused bunches to the interaction region.

Use of magnetic fields increases the frequency of excited plasma waves.

Wakefield amplitude is significantly increased with magnetic field application.

Abstract

Earlier, the authors found a mechanism for the sequence of short relativistic electron bunches, which leads to resonant excitation of the wakefield, even if the repetition frequency of bunches differs from the plasma frequency. In this case, the synchronization of frequencies is restored due to defocusing of the bunches which get into the bad phases with respect to the plasma wave. However, in this case, the bunches are lost, which as a result of this do not participate in the excitation of the wakefield. In this paper, numerical simulation was used to study the dynamics of electron bunches and the excitation of the wakefield in a magnetized plasma by a long sequence of short bunches of relativistic electrons. When a magnetic field is used, the defocussed bunches return to the region of interaction with the field after a certain time. In this case, the electrons of the bunches, returning to the necessary phases of the field, participate in the excitation of the wakefield. Also, the use of a magnetic field leads to an increase of the frequency of the excited wave relative to the repetition frequency of bunches. The latter increases the time for maintaining the resonance and, consequently, leads to an increase of the amplitude of the excited wakefield.