Velocity bunching in travelling wave accelerator with low acceleration gradient

TL;DR

This paper analyzes how low acceleration gradients in velocity bunching within traveling wave accelerators improve beam compression, phase jitter tolerance, and emittance control, supported by analytical and simulation results.

Contribution

It introduces a low-gradient velocity bunching scheme that enhances compression quality and stability, along with an adjustable transverse emittance compensation method.

Findings

Low acceleration gradients increase phase jitter tolerance.

The scheme achieves symmetrical longitudinal distribution and low energy spread.

Emittance growth can be effectively compensated with an adjustable scheme.

Abstract

We present the analytical and simulated results concerning the influences of the acceleration gradient in the velocity bunching process, which is a bunch compression scheme that uses a traveling wave accelerating structure as a compressor. Our study shows that the bunch compression application with low acceleration gradient is more tolerant to phase jitter and more successful to obtain compressed electron beam with symmetrical longitudinal distribution and low energy spread. We also present a transverse emittance compensation scheme to compensate the emittance growth caused by the increasing of the space charge force in the compressing process that is easy to be adjusted for different compressing factors.