Experimental characterization of electron beam driven wakefield modes in a dielectric woodpile Cartesian symmetric structure

Abstract

The use of photonic structures in the terahertz (THz) spectral region may enable the essential characteristics of confinement, modal control, and electric field shielding for very high gradient accelerators based on wakefields in dielectrics. We report here an experimental investigation of THz wakefield modes in a 3D photonic woodpile structure. Selective control in exciting or suppressing of wakefield modes with non-zero transverse wave vector is demonstrated by using drive beams of varying transverse ellipticity. Additionally, we show that the wakefield spectrum is insensitive to the offset position of the strongly elliptical beam. These results are consistent with analytic theory and 3D simulations, and illustrate a key advantage of wakefield systems with Cartesian symmetry, the suppression of transverse wakes by elliptical beams.

Submitted to the Physical Review Letters

References in corpus (5)

• Dielectric Laser Acceleration
• Three-dimensional dielectric photonic crystal structures for laser-driven acceleration
• Experimental demonstration of wakefield effects in a THz planar diamond accelerating structure
• Theory of Cherenkov radiation in periodic dielectric media: Emission spectrum
• Three-Dimensional Analysis of Wakefields Generated by Flat Electron Beams in Planar Dielectric-Loaded Structures

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• Analytical theory of the skewed wake effect