Radiation reactiondominated regime of wakefield acceleration
Abstract
We study electron acceleration in a plasma wakefield under the influence of the radiationreaction force caused by the transverse betatron oscillations of the electron in the wakefield. Both the classical and the strong quantumelectrodynamic (QED) limits of the radiation reaction are considered. For the constant accelerating force, we show that the amplitude of the oscillations of the QED parameter $\chi$ in the radiationdominated regime reaches the equilibrium value determined only by the magnitude of the accelerating field, while the averaged over betatron oscillations radiation reaction force saturates at the value smaller than the accelerating force and thus is incapable of preventing infinite acceleration. We find the parameters of the electron bunch and the plasma accelerator for which reaching such a regime is possible. We also study effects of the dephasing and the corresponding change of accelerating force over the course of acceleration and conclude that the radiationdominated regime is realized both in cases of singlestage acceleration with slow dephasing (usually corresponding to bunchdriven plasma accelerators) and multistage acceleration with fast dephasing (corresponding to the use of laserdriven accelerators).
 Publication:

arXiv eprints
 Pub Date:
 September 2021
 arXiv:
 arXiv:2109.04866
 Bibcode:
 2021arXiv210904866G
 Keywords:

 Physics  Plasma Physics;
 Physics  Accelerator Physics
 EPrint:
 15 pages, 9 figures