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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In this study, the micron-size hydrogen clusters were generated by expanding the supercooled high-pressure hydrogen gas into a vacuum via a conical nozzle connected to a solenoid valve cooled by a cryogenic refrigerator. The size distribution of the hydrogen clusters is evaluated by measuring the angular distribution of laser light scattered from the cluster. The data were analyzed based on Mie scattering theory combined with Tikhonov regularization method. The size distribution of the hydrogen clusters was found distributed from 0.3-2.0 um. The background gas density profile of the targets is also evaluated using a Nomarski interferometer assuming the cylindrical symmetry of the target.
The 3D Particles-in-Cell (PIC) simulations concerning interaction processes of micron-size hydrogen clusters with high power laser pulses predict the generation of protons exceeding 100 MeV, accelerated in a laser propagation direction via an anisotropic Coulomb explosion mechanism, demonstrating a future candidate in laser-driven proton sources with the upcoming multi-PW lasers.
Development of Micron-size Hydrogen Cluster Targets for Laser-Plasma Interactions
