Ryoichi Hajima

National Institutes for Quantum and Radiological Science and Technology — Japan

Engineering · Physical Sciences

23h-index1.8kcitations310works0.62yr avg
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Research Topics

Particle Accelerators and Free-Electron Lasers(146), Particle accelerators and beam dynamics(105), Nuclear Physics and Applications(60), Advanced X-ray Imaging Techniques(52), Gyrotron and Vacuum Electronics Research(46)

Publications309 total

Stable operation of a fully energy-recovered 1-mA-class electron beam at a compact energy-recovery linac
Physical Review Accelerators and Beams·2025Open Access
Photon vortex generation from nonlinear Compton scattering in Feynman approach
Physical review. D/Physical review. D.·2025· 1 citedOpen Access
Effect of Coaxial Hpge Detector Structure on Γ-Ray Beam Measurements
SSRN Electronic Journal·2025Open Access
Photon vortex generation from nonlinear Compton scattering in Feynman approach
arXiv (Cornell University)·2024Open Access
Temporal evolution of electron-bunch length in macropulse of resonator-type free-electron lasers
iScience·2024Open Access
Stable beam operation of approximately 1 mA beam under highly efficient energy recovery conditions at compact energy-recovery linac
arXiv (Cornell University)·2024Open Access
Beam characterization of mid-infrared free electron laser to drive high-harmonic generation
Japanese Journal of Applied Physics·2024· 1 citedOpen Access
Breakdown of argon by a train of high-repetition long-wave-infrared pulses from a free-electron laser oscillator
Optics Express·2024Open Access
Spin and parity assignments for low-lying states in the odd-mass nucleus <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">Ta</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>181</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>
Physical review. C·2024
Nondestructive determination of isotopic abundance using multi-energy nuclear resonance fluorescence driven by laser Compton scattering source
Journal of Applied Physics·2024· 3 citedOpen Access
Carrier-envelope phase stabilization in FEL oscillators
Journal of Physics Conference Series·2024· 2 citedOpen Access
Photon vortex generation by synchrotron radiation experiments in relativistic quantum approach
Physical Review Research·2023· 6 citedOpen Access
Nonlinear compression of naturally down-chirped superradiance pulses from a free-electron laser oscillator by thick germanium plates
Optics Express·2023· 1 citedOpen Access
High-Power Light Source for EUV Lithography Based on the Energy-Recovery Linac Free-Electron Laser
SPIE eBooks·2023· 2 cited
Generation of Naturally Down-Chirped Few-Cycle Pulse from Free-Electron Laser Oscillator and Its Pulse Compression
2023
Laser-induced gas breakdown by a train of femtosecond long-wave infrared FEL pulses
2023
Author Correction: Full characterization of superradiant pulses generated from a free-electron laser oscillator
Scientific Reports·2023Open Access
Corrigendum on “Record high extraction efficiency of free electron laser oscillator” [Appl. Phys. Express 13, 102007 (2020)]
Applied Physics Express·2023· 1 citedOpen Access
Full characterization of superradiant pulses generated from a free-electron laser oscillator
Scientific Reports·2023· 20 citedOpen Access
Generation of primary photons through inverse Compton scattering using a Monte Carlo simulation code
Physical Review Accelerators and Beams·2022· 12 citedOpen Access
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Frequent Co-authors

Ryoji Nagai(18), N. Nishimori(17), T. Shizuma(17), Takehito Hayakawa(14), N. Kikuzawa(13), Eisuke Minehara(13), Hideaki Ohgaki(10), H. Toyokawa(6), Y. Honda(6), Tsukasa Miyajima(6), M. Sawamura(6), Masahiro Yamamoto(5), M. Kuriki(4), Toshiteru Kii(4), Heishun Zen(4), M. Kando(3), Norio Nakamura(3), Miho Shimada(3), Shunya Matsuba(3), Hokuto Iijima(3)