Designing a Dielectric Laser Accelerator on a Chip

8th International Particle Accelerator Conference

Niedermayer, Uwe^1 ; Boine-Frankenheim, Oliver^1 ; Egenolf, Thilo^1

TEMF, TU-Darmstadt, Schlossgartenstr. 8, Darmstadt

64289, Germany^1

关键词: Dielectric structure;    Incident laser;    Laser acceleration;    Laser accelerators;    Long-term goals;    Low energy electrons;    Matched gratings;    Particle tracking;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/874/1/012041/pdf
DOI  :  10.1088/1742-6596/874/1/012041

来源: IOP

【 摘 要 】

Dielectric Laser Acceleration (DLA) achieves gradients of more than 1GeV/m, which are among the highest in non-plasma accelerators. The long-term goal of the ACHIP collaboration is to provide relativistic (>1 MeV) electrons by means of a laser driven microchip accelerator. Examples of "slightly resonant" dielectric structures showing gradients in the range of 70% of the incident laser field (1 GV/m) for electrons with beta=0.32 and 200% for beta=0.91 are presented. We demonstrate the bunching and acceleration of low energy electrons in dedicated ballistic buncher and velocity matched grating structures. However, the design gradient of 500 MeV/m leads to rapid defocusing. Therefore we present a scheme to bunch the beam in stages, which does not only reduce the energy spread, but also the transverse defocusing. The designs are made with a dedicated homemade 6D particle tracking code.