量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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We present the experimentally generated electron bunch from laser-wakefield
acceleration (LWFA) with charge of 620 pC and maximum energy up to 0.6 GeV by
irradiating 80 TW laser pulses at 3 mm Helium gas jet. The charge of injected
electrons is much larger than the normal scaling laws of LWFA in bubble regime. We
also got a quasi-mononeregetic electron beam with energy peaked at 249 MeV and
charge of 68 pC with the similar laser conditions but lower plasma density. As
confirmed by 2D particle-in-cell (PIC) simulations, the boosted bunch charge is due
to the continuous injection caused by the self-steepening and self-compression of
laser pulse. During the nonlinear evolution of laser pulse, the bubble structure
broadens and stretches, leading to a longer dephasing length and larger beam charge.
Generation of 20 kA electron beam from a laser wakefield accelerator
