WEP107 　レーザー　 8月8日 大展示ホール 13:10 - 15:10

非相対論的エネルギー領域における電子の共振器型レーザー駆動誘電体加速の数値解析

Numerical study of resonant dielectric laser acceleration of nonrelativistic electrons

○陳 昭福（東大），小山 和義（高エネ研），上坂 充（東大），吉田 光宏（高エネ研）

○Zhaofu Chen (Tokyo University), Kazuyoshi Koyama (KEK), Mitsuru Uesaka (Tokyo University), Mitsuhiro Yoshida (KEK)

Dielectric laser accelerators (DLAs) have attracted more interest in recent years due to its potential to enable a compact electron source. We show that by making use of the high reflectivity of the subwavelength gratings in a dual-grating structure to form a Fabry-Perot cavity, the synchronous mode between the gratings can be greatly enhanced for dielectric laser acceleration of subrelativistic electrons. We demonstrate the quasi-symmetry of the accelerating mode that is desirable for a variety of applications. The dependence of reflectivity and phase on the grating dimensions is utilized to control the cavity performance including the Q factor and filling time. The design can significantly reduce the input laser power and may enable a compact on-chip accelerator.