Plasma acceleration limitations due to betatron radiation

TL;DR

This paper investigates how betatron radiation limits plasma acceleration at high energies, highlighting an additional source of energy spread beyond beam loading effects.

Contribution

It introduces betatron radiation as a new factor affecting energy spread in plasma acceleration, which has been less explored compared to beam loading.

Findings

Betatron radiation causes significant energy spread at high energies.

Traditional beam loading techniques do not mitigate betatron radiation effects.

Addressing betatron radiation is crucial for improving plasma accelerator performance.

Abstract

High energy spread caused by the longitudinal size of the beam is well known in wake-field acceleration. Usually this issue can be solved with beam loading effect that allows to keep accelerating field nearly constant, along the whole duration of the beam. In this work, however, we would like to address another source of energy spread that arises at high energy, due to betatron radiation.