The Inverse-Cherenkov Dielectric Laser Accelerator With Multichannel

The dielectric laser accelerator (DLA) based on the inverse Cherenkov effect has emerged as a promising candidate for next-generation desktop or even on-chip particle accelerators. To achieve a high acceleration gradient, the width of the bunch channel is typically in the subwavelength scale, which essentially limits the accelerated beam current. To overcome this limitation, here we put forward a novel acceleration structure featuring multiple bunch channels, which is composed of a set of dielectric prisms and a series of dielectric slabs. The introduction of slab boundaries redistributes the laser-induced surface wave in the bunch channel. By adjusting the thicknesses of the slabs, the same field distributions can be obtained in all channels, enabling simultaneous acceleration of multiple electron beams and enhancing the output current intensity by several times. Detailed theoretical analysis, combined with full-field and particle tracking simulations, verify the effectiveness of our approach. This proposed scheme has great potential in developing high-current DLAs for practical applications.