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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After the development of chirped pulse amplification by G. Mouro, laser ion acceleration has attracted a lot of interest for various fields of research, such as high energy density physics, nuclear physics, and fast ignition scheme in inertial confinement fusion. Recent theoretical and numerical investigations predict generation of sub-GeV to GeV energy ions. However, it is difficult to discriminate GeV-scale ions into different mass and energies using conventional diagnostic instruments (e.g. Thomson parabola spectrometer, solid state nuclear track detector).
We have developed a novel diagnostic system based on particle counting analysis (PCA), which is generally used in nuclear physics experiments. The diagnosis provides a mass-dependent ion spectrum based on time-of-flight and pulse-height analysis of single particle events. With a novel arrangement of multiple scintillators with different ion stopping powers, PCA offers potential advantages over commonly used diagnostics in terms of coverage solid angle, detection efficiency, and real-time analysis for GeV-scale ions. The basic detector setup was tested using the Heavy Ion Medical Accelerator in Chiba (HIMAC) in Japan. Our system shows its ability to resolve protons, B^5+, C^6+, and O^8+ ion beams with energy range of 60-430 MeV/u. We also discuss an advanced detector design using multi-layered scintillator pixel array coupled with avalanche photodiodes, which allows angularly-resolved analysis and makes PCA more practical diagnostic technique in laser-driven particle acceleration experiments.
会議概要（会議名, 開催地, 会期, 主催者等）
High Temperature Plasma Diagnostics Conference 2022
A scintillator pixel array for real-time spectroscopy of GeV-scale and multi-species ions produced in laser-plasma experiments
