Study of a dielectric internal laser accelerating structure

Abstract

High acceleration gradients can be realized in dielectric laser accelerators (DLAs) due to their high damage thresholds; hence, they are promising candidates for miniaturized particle accelerators. In this study, we present a new type of DLA, in which the accelerating laser is generated inside the accelerating structure, by etching the grating of the acceleration structure and a Brewster window on the semiconductor dielectric material, and the acceleration region is within the internal structure of the laser resonator. The consistency of the electric vector oscillation direction of the laser with the direction of the beam motion is maintained by passing through the Brewster window. The internal laser is used as the excitation source; hence, the need of high power laser distribution can be mitigated, and the complete DLA device is more compact. Particle-in-cell (PIC) simulation is employed to investigate the energy gain of the electron in this structure.