Speaker
Description
Particle accelerators are key tools in scientific research, medicine, and industry. However, mainstream accelerator technologies face challenges such as large footprints and high costs. Dielectric laser accelerators (DLAs) utilize the interaction between high-frequency lasers and nanograting structures in dielectric media to generate high-intensity near-fields with electric field strengths reaching GeV/m. Studies indicate that driving DLAs via the inverse Cherenkov radiation effect can achieve acceleration gradients of 3 GeV/m, and cascaded acceleration holds promise for accelerating electrons to MeV energies. this approach increases electron bunch emittance, leading to significant particle loss. Here we propose a method that integrates periodic focusing structures in a cascaded acceleration scheme, effectively alleviating the increase in emissivity. We employed COMSOL Multiphysics to simulate the electromagnetic fields of the prism accelerator and the periodic alternating focusing structure. These fields were then imported into General Particle Tracer (GPT) software to simulate and compare electron trajectories and emittances with and without the focusing structure. Results demonstrate that the periodic alternating focusing structure significantly reduces electron emittance and lowers particle loss rates, providing an effective pathway towards realizing on-chip electron accelerators.
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