Ion motion in the wake driven by long particle bunches in plasmas

Abstract

We explore the role of the background plasma ion motion in self-modulated plasma wakefield accelerators. We employ J. Dawson's plasma sheet model to derive expressions for the transverse plasma electric field and ponderomotive force in the narrow bunch limit. We use these results to determine the on-set of the ion dynamics, and demonstrate that the ion motion could occur in self-modulated plasma wakefield accelerators. Simulations show the motion of the plasma ions can lead to the early suppression of the self-modulation instability and of the accelerating fields. The background plasma ion motion can nevertheless be fully mitigated by using plasmas with heavier plasmas.

arXiv comment23 pages, 6 figures

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• Wakefield decay in a radially bounded plasma due to formation of electron halo
• Proton beam self-modulation seeded by electron bunch in plasma with density ramp
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• Experimental study of extended timescale dynamics of a plasma wakefield driven by a self-modulated proton bunch
• Recovery of hydrogen plasma at the sub-nanosecond timescale in a plasma-wakefield accelerator
• Signatures of the self-modulation instability of relativistic proton bunches in the AWAKE experiment