Physics – Plasma Physics
Scientific paper
2011-07-30
Physics
Plasma Physics
Scientific paper
It is demonstrated that the performance of the self-modulated proton driver plasma wakefield accelerator (SM-PDPWA) is strongly affected by the reduced phase velocity of the plasma wave. Using analytical theory and particle-in-cell simulations, we show that the reduction is largest during the linear stage of self-modulation. As the instability nonlinearly saturates, the phase velocity approaches that of the driver. The deleterious effects of the wake's dynamics on the maximum energy gain of accelerated electrons can be avoided using side-injections of electrons, or by controlling the wake's phase velocity by smooth plasma density gradients.
Khudik Vladimir
Kumar Nirman
Lotov Konstantin
Muggli P.
Pukhov Alexander
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