Planar-Dielectric-Wakefield Accelerator Structure Using Bragg-Reflector Boundaries

G. Andonian, O. Williams, S. Barber, D. Bruhwiler, P. Favier, M. Fedurin, K. Fitzmorris, A. Fukasawa, P. Hoang, K. Kusche, B. Naranjo, B. O'Shea (+4 others)
2014 Physical Review Letters  
We report experimental measurements of narrowband, single-mode excitation, and drive beam energy modulation, in a dielectric wakefield accelerating structure with planar geometry and Braggreflector boundaries. A short, relativistic electron beam (∼1ps) with moderate charge (∼100pC) is used to drive the wakefields in the structure. The fundamental mode of the structure is reinforced by constructive interference in the alternating dielectric layers at the boundary, and is characterized by the
more » ... cterized by the spectral analysis of the emitted coherent Cherenkov radiation signal. Data analysis shows a narrowband peak at 210GHz corresponding to the fundamental mode of the structure. Simulations in both 2D and 3D provide insight into the propagating fields and reproduction of the electron beams dynamics observables and emitted radiation characteristics.
doi:10.1103/physrevlett.113.264801 pmid:25615344 fatcat:qqi3j5neujbyjdak6qkdr3riai