Structure study of a dielectric laser accelerator with discrete translational symmetry

Abstract

Dielectric laser accelerator (DLA) is a promising technology for achieving high gradient acceleration in a compact design. Its advantages include ease of cascading and energy gain per unit distance that can exceed that of conventional accelerators by two orders of magnitude. This paper establishes rules for efficient particle acceleration using dielectric structures based on basic equations, proposes a design principle for DLA structures with clear physical images, and verifies the accuracy of the corresponding energy gain formula. DLA structures with different specifications, materials, and geometric shapes are constructed, and the achievable acceleration gradient is calculated. Our results demonstrate that effective acceleration can be achieved when the electric field sensed by particles in the acceleration cavity has zero frequency, which provides a powerful method for designing such devices. Furthermore, we demonstrate that the simplified formula for calculating energy gain presented in this paper can accurately determine the energy gain of particles during the design of dielectric accelerator acceleration structures.