2023 Fiscal Year Final Research Report

X-ray source for Novel imaging paradigm

Research Project

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Project/Area Number	19H00669
Research Category	Grant-in-Aid for Scientific Research (A)
Allocation Type	Single-year Grants
Section	一般
Review Section	Medium-sized Section 14:Plasma science and related fields
Research Institution	National Institutes for Quantum Science and Technology
Principal Investigator	PIROZHKOV Alexander 国立研究開発法人量子科学技術研究開発機構, 関西光量子科学研究所光量子ビーム科学研究部, 上席研究員 (00446410)
Co-Investigator(Kenkyū-buntansha)	Esirkepov Timur 国立研究開発法人量子科学技術研究開発機構, 関西光量子科学研究所光量子ビーム科学研究部, 上席研究員 (10370363) 匂坂明人国立研究開発法人量子科学技術研究開発機構, 関西光量子科学研究所光量子ビーム科学研究部, 主幹研究員 (20354970) 小倉浩一国立研究開発法人量子科学技術研究開発機構, 関西光量子科学研究所光量子ビーム科学研究部, 専門業務員 (30354971) Pikuz Tatiana 大阪大学, 先導的学際研究機構, 特任准教授(常勤) (20619978) 難波愼一広島大学, 先進理工系科学研究科(工), 教授 (00343294) 桐山博光国立研究開発法人量子科学技術研究開発機構, 関西光量子科学研究所光量子ビーム科学研究部, グループリーダー (40354972) Koga James 国立研究開発法人量子科学技術研究開発機構, 関西光量子科学研究所光量子ビーム科学研究部, 専門業務員 (70370393) 神門正城国立研究開発法人量子科学技術研究開発機構, 関西光量子科学研究所, 副所長 (50343942)
Project Period (FY)	2019-04-01 – 2024-03-31
Keywords	Coherent x-ray source / New imaging paradigm / BISER / Laser plasma / Relativistic plasma / Plasma singularities / Relativistic singularity
Outline of Final Research Achievements	We demonstrated orders-of-magnitude x-ray yield enhancement of a new ultrabright coherent x-ray source based on the new principle, Burst Intensification by Singularity Emitting Radiation (BISER). The source is driven by high-power femtosecond laser and, unlike km-size accelerator-driven sources, is compact, with under a meter-size activated area. We demonstrated pulses with 10 μJ energy and 10^12 photons in the 60-100 eV photon energy range, and total bandwidth exceeding 1 keV, which corresponds to <10 attosecond (10^-17 second) bandwidth limit. We characterized BISER x-rays with high-resolution spectrographs and demonstrated high signal-to-noise Auger- and photoelectron spectra from single-shot BISER irradiation of Xe gas. Operating the BISER source at 0.1 Hz and 1 Hz repetition rates, we performed an x-ray imaging demonstration experiment where diffraction patterns revealed three periods of the sample (200 nm, 4 μm, and 150 μm).
Free Research Field	Physics
Academic Significance and Societal Importance of the Research Achievements	X-rays have revolutionized science and society, with the present state-of-the-art kilometer-size sources. Our results will lead to revolutionary next-generation compact in-lab and in-fab x-ray imaging facilities far exceeding present capabilities and opening quantum imaging perspectives.