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 and Radiological Science and Technology.
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We discuss ion acceleration by irradiating an ultra thin target with an intense laser pulse. We have investigated space and astrophysical phenomena in laser produced plasmas, such as collisionless shocks and magnetic reconnections. We observed electric/magnetic structures in laser produced plasmas with proton radiography with large laser facilities. Recently we have been working to further scale down the experiments with a relatively small laser facility using ultra intense laser pulses to develop relativistic laboratory astrophysics. In order to perform proton radiography at such small facilities, we need a very thin target to achieve high energies of protons/ions with the limited laser energy, and also to reduce the radioactive contaminations. We have developed a large-area suspended graphene as a target for ion acceleration experiment. The thickness of the graphene target is 1 nm, an atomic thin, with the diameter of ~ 1 mm, resulting the aspect ratio of 10^6. Stable and reasonable mass-production of low atomic number free-standing ultra-thin targets with nanometer accuracy allows us to investigate ion acceleration such as the radiation pressure acceleration. We will use the energetic ion beams to measure electric/magnetic field in laboratory astrophysics experiments.
会議概要（会議名, 開催地, 会期, 主催者等）
Sixth International Conference on Energy Density Physics (ICHED2017)
Ion acceleration with an extremely thin target
