Kavli Affiliate: Robert L. Byer
| First 5 Authors: Payton Broaddus, Thilo Egenolf, Dylan S. Black, Melanie Murillo, Clarisse Woodahl
| Summary:
We demonstrate a silicon-based electron accelerator that uses laser optical
near fields to both accelerate and confine electrons over extended distances.
Two dielectric laser accelerators (DLA) designs were tested, each consisting of
two arrays of silicon pillars pumped symmetrically by pulse front tilted (PFT)
laser beams, designed for average acceleration gradients 35MeV/m and 50MeV/m
respectively. The DLA are designed to act as Alternating Phase Focusing (APF)
lattices, where electrons, depending on the electron-laser interaction phase,
will experience alternating longitudinal/transverse focusing/defocusing. By
incorporating fractional period drift sections that alter the synchronous phase
between $pm 60^circ$ off-crest, electrons captured in the designed
acceleration bucket experience half the peak gradient as average gradient while
also experiencing strong confinement forces that enable long interaction
lengths. We demonstrate APF accelerators with interaction lengths up to
708$mu$m and energy gains up to $23.7 pm 1.07$ keV FWHM, a 25% increase from
starting energy, demonstrating the ability to achieve substantial energy gains
with sub-relativistic DLA.
| Search Query: ArXiv Query: search_query=au:”Robert L. Byer”&id_list=&start=0&max_results=3