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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In the high energy, high density plasmas formed by the interaction of an ultra-short pulse laser with a ~100nm-1µm target foil, ions are generated by Target Normal Sheath Acceleration (TNSA). TNSA and specifically the formation of the sheath field on the rear surface of the target needs to be better understood in order to optimize laser driven ion beams for applications such as medical hadron therapy. An understanding of the electron dynamics that control formation of the sheath field in the target is essential and studying x-ray emission from the interaction region provides valuable information about the electron population. For this purpose, preliminary measurements of the spatial and spectral characteristics of the interaction region generated by the irradiation of ultra-thin foil targets by the 1022W/cm2 J-KAREN-P laser have been made via penumbral imaging of the x-ray source and continuum x-ray spectroscopy.
Spatial and spectral x-ray characterization of the Target Normal Sheath Acceleration regime
