WEOM01 　レーザー／粒子源１　 8月10日 会議室201 10:10 - 10:30

格子構造中におけるレーザー駆動誘電体加速の数値解析

Numerical study of a laser-driven grating-based dielectric accelerator

○陳 昭福（東大・原子力国際専攻），小山 和義，上坂 充（東大・原子力専攻），吉田 光宏（高エネ研），岡元 勇人（東大・原子力国際専攻）

○Zhaofu Chen (UTokyo, Dept. of NEM), Kazuyoshi Koyama, Mitsuru Uesaka (UTokyo, Nuclear Professional School), Mitsuhiro Yoshida (KEK), Hayato Okamoto (UTokyo, Dept. of NEM)

The dielectric laser accelerators (DLAs) have attracted increasing interest in the recent years due to its potential for high acceleration gradient. We present numerical investigation of a dual dielectric grating structure designed for the 50 keV electrons. The simulation results show that this structure efficiently modulates the wave front of the incident laser and generates electric field parallel to the electron travel direction at the synchronous phase velocity. We exploit the first spatial harmonic of the grating structure to accelerate the electrons, with the height and width of the pillar of the grating optimized for the maximum acceleration gradient. We also investigate the effect of the starting phase in the optical cycle, indicating the capability of bunching with the structure. The described design shows great potential in staging by adding consecutive acceleration regions due to the linear interaction of the laser-induced electric field with the electrons. The potential of the smaller size as well as the lower cost of DLAs may enable the wide use of accelerators for higher energy physics, university-scale light sources and radiobiology applications.