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レーザー電子加速による10MeV級電子バンチ発生の安定化

Stabilization of 10MeV class electron bunch generation by laser accelerator

近藤 公伯

Kondo, Kiminori

レーザー電子加速の研究進捗は著しく、最近はその安定化が精力的に研究されつつある。本研究では関西光科学研究所で行った航跡場加速電子の安定化の実験結果を報告する。Arガスジェットをターゲットに用いれば広がり角が5mradのきわめて安定した電子バンチが8MeVのピークエネルギーで得られる。本来は、電子密度のみが物理を決めると考えられていたが、ターゲットに利用するガス種を変えることでその電子発生の様子が著しく異なるという重要な知見が得られた。

The laser acceleration study has been advanced remarkably. Recently, a stable electron bunch generation is one of a hot topic. In this paper, we will present a successful stabilization of electron bunch generation by laser wakefield accelerator, which has been performed at KPSI in this spring. With Ar gas jet target, a very narrow beam divergence of 5 mrad has been obtained, while the peak energy of the electron energy spectrum was 8MeV. Although the laser acceleration physics were thought to be determined only by a electron plasma density, this experimental results suggests that it has been affected noy only by the electron density, but also by the spieces of gas.

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