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In electron beam driven dielectric wakefield acceleration, transverse modes develop when particles are injected off-axis. The transverse modes manifest as particle kicks or focusing/defocusing which have deleterious effects on the beam phase space and can lead to beam breakup. Controlling the development of the transverse modes with external magnetic focusing can lead to an extended beam interaction. In this paper, we describe an alternative method of purposeful excitation of specific transverse modes to counteract and delay the onset of beam break up in dielectric wakefield acceleration. The method takes advantage of an alternating array of planar dielectric lined waveguides, such that the periodicity of the channel provides an overall focusing effect on the drive beam. Results from a recent experiment conducted at the Argonne Wakefield Accelerator are reported.
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