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A future plasma based linear collider has the potential to reachunprecedented energies and transform our understanding of high energy physics.The extremely dense beams in such a device would cause the plasma ions to falltoward the axis. For more mild ion motion, this introduces a nonlinearperturbation to the focusing fields inside of the bubble. However, for extremeion motion, the ion distribution collapses to a quasi-equilibrium characterizedby a thin filament of extreme density on the axis which generates strong,nonlinear focusing fields. These fields can provoke unacceptable emittancegrowth that can be reduced through careful beam matching. In this paper, wediscuss the rich physics of ion motion, give a brief overview of plans for theE-314 experiment at FACET-II which will experimentally demonstrate ion motionin plasma accelerators, and present results of particle-in-cell simulations ofion motion relevant to the E-314 experiment.

Plasma Wakefield Accelerators with Ion Motion and the E-314 Experiment at FACET-II