Abstract
Experimental results are reported for test beam acceleration and deflection in a two-channel, cm-scale, rectangular dielectric-lined wakefield accelerator structure energized by a 14-MeV drive beam. The dominant waveguide mode of the structure is at $\ensuremath{\sim}30\text{ }\text{ }\mathrm{GHz}$, and the structure is configured to exhibit a high transformer ratio ($\ensuremath{\sim}12\ensuremath{\mathbin:}1$). Accelerated bunches in the narrow secondary channel of the structure are continuously energized via Cherenkov radiation that is emitted by a drive bunch moving in the wider primary channel. Observed energy gains and losses, transverse deflections, and changes in the test bunch charge distribution compare favorably with predictions of theory.
Highlights
There is steadily growing interest within the accelerator community towards exploration of dielectric-loaded single- or multiple-channel structures that can support wakefields driven by either a single electron bunch or a periodic train of bunches
Experimental results are reported for test beam acceleration and deflection in a two-channel, cm-scale, rectangular dielectric-lined wakefield accelerator structure energized by a 14-MeV drive beam
We explored a version of the two-channel structure with favorable symmetry, namely, a coaxial dielectric wakefield accelerator [12,15]; in this structure, lateral forces on the test bunch vanish to lowest order
Summary
There is steadily growing interest within the accelerator community towards exploration of dielectric-loaded single- or multiple-channel structures that can support wakefields driven by either a single electron bunch or a periodic train of bunches. This interest provided strong incentive for research which we report in this paper. Wakefields can be spatially localized and move at near-light velocity in a vacuum channel surrounded by dielectric These features ensure that exposed dielectric surfaces are subjected to high field magnitudes for only brief intervals of time, thereby reducing the likelihood for breakdown and permanent structure damage
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