Comparison of experimental tests and theory for a rectangular two-channel dielectric wakefield accelerator structure

• Main Authors: S. V. Shchelkunov, T. C. Marshall, G. Sotnikov, J. L. Hirshfield, Wei Gai, M. Conde, J. Power, D. Mihalcea, Z. Yusof
• Format: Article
• Language: English
• Published: American Physical Society 2012-03-01
• Series: Physical Review Special Topics. Accelerators and Beams
• Online Access: http://doi.org/10.1103/PhysRevSTAB.15.031301

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 ∼30  GHz, and the structure is configured to exhibit a high transformer ratio (∼12∶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.