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 investigations on betatron x-ray source and electron beams from ionization injection in the nitrogen gas. Currently the betatron x-rays are usually produced via self-injected electron beams, which is not controllable and not optimized for x-ray yields. A total photon yield 8×108 /shot and 108 photons with energy over 110 keV are obtained. In particular, the yield is 10 times higher than the case of self-injection mode in helium under similar laser parameters. On the other hand, stable quasi-monoenergetic electron beams with peak energies > 220MeV were generated by incident the 80TW laser pulse into a single stage pure nitrogen gas jet target. The results suggest that nitrogen gas jet could be simply used as the first stage for multi-stage electron acceleration.
Study of Betatron x-ray enhancement and quasi-monoenergetic electron beam generation from ionization injection in LWFA
