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Description
Beam driven wakefield acceleration in dielectric lined waveguide structures, or similarly corrugated metallic waveguides, produces high acceleration fields but also produces coupling to transverse modes. Transverse modes can lead to beam breakup and degradation of the drive beam. Employing flat beams with highly asymmetric emittance in dielectric structures with planar geometry, has been experimentally shown to mitigate this effect. Further experiments with flat beams traveling in planar dielectric structures have revealed skew-quadrupole like effects when beams are injected with small angles, with respect to the beam axis. In order to characterize these effects, a field fitting algorithm based on screen observations was developed to reconstruct the transverse fields in the experiment. Finally, other investigations into transverse mode effects were conducted, including an alternating planar dielectric structure scheme.