A5052966732- Laser-Plasma Interactions and Diagnostics
- Laser-Matter Interactions and Applications
- Muon and positron interactions and applications
- Laser-induced spectroscopy and plasma
- Advanced Fiber Laser Technologies
- Atomic and Molecular Physics
- Solid State Laser Technologies
- Photorefractive and Nonlinear Optics
- Plasma Diagnostics and Applications
- Laser Design and Applications
- High-pressure geophysics and materials
- Particle accelerators and beam dynamics
- Advanced Fluorescence Microscopy Techniques
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Particle physics theoretical and experimental studies
- Advanced X-ray Imaging Techniques
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Superconducting Materials and Applications
- Laser Material Processing Techniques
- Ion-surface interactions and analysis
- Photocathodes and Microchannel Plates
- Calibration and Measurement Techniques
- Semiconductor materials and devices
Waseda University
2024
High Energy Accelerator Research Organization
2016-2024
Tokyo University of Science
2001-2024
Central Research Institute of Electric Power Industry
2006-2023
Japan Proton Accelerator Research Complex
2018-2023
RIKEN Center for Advanced Photonics
2023
The Graduate University for Advanced Studies, SOKENDAI
2023
RIKEN Nishina Center
2013-2016
RIKEN
2003-2015
RIKEN Advanced Science Institute
2005-2015
This paper introduces a new approach to measure the muon magnetic moment anomaly |$a_{\mu} = (g-2)/2$| and electric dipole (EDM) |$d_{\mu}$| at J-PARC facility. The goal of our experiment is |$a_{\mu}$| using an independent method with factor 10 lower momentum, 20 smaller diameter storage-ring solenoid compared previous ongoing |$g-2$| experiments unprecedented quality storage field. Additional significant differences from present experimental include 1000 transverse emittance beam...
We have proposed and demonstrated a novel approach for generating high-energy extreme-ultraviolet (XUV) continuum radiation. When two-color laser field consisting of sub-10-fs fundamental its parallel-polarized second harmonic was applied to high-order generation in argon, spectrum centered at 30 nm successfully obtained with an energy as high 10 nJ. This broadband emission indicates the possibility intense single attosecond pulses XUV region.
We report the demonstrated irradiation effect of laser-accelerated protons on human cancer cells. In vitro (living) A549 cells are irradiated with quasimonoenergetic proton bunches 0.8–2.4 MeV a single bunch duration 15 ns. Irradiation dose 20 Gy results in distinct formation γ-H2AX foci as an indicator DNA double-strand breaks generated This is pioneering result that points to future investigations radiobiological effects laser-driven ion beams. Unique high-current and short-bunch features...
Duration-controlled amplified spontaneous emission with an intensity of ${10}^{13}\phantom{\rule{0.3em}{0ex}}\mathrm{W}∕{\mathrm{cm}}^{2}$ is used to convert a $7.5\text{\ensuremath{-}}\ensuremath{\mu}\mathrm{m}$-thick polyimide foil into near-critical plasma, in which the $p$-polarized, $45\text{\ensuremath{-}}\mathrm{fs}$, ${10}^{19}\text{\ensuremath{-}}\mathrm{W}∕{\mathrm{cm}}^{2}$ laser pulse generates $3.8\text{\ensuremath{-}}\mathrm{MeV}$ protons, emitted at some angle between target...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation M. Nishiuchi, I. Daito, Ikegami, H. Daido, Mori, S. Orimo, K. Ogura, A. Sagisaka, Yogo, Pirozhkov, Sugiyama, Kiriyama, Okada, Kanazawa, Kondo, T. Shimomura, Tanoue, Y. Nakai, Sasao, D. Wakai, Sakaki, P. Bolton, W. Choi, J. Sung, Lee, Oishi, Fujii, Nemoto, Souda, Noda, Iseki, Yoshiyuki; Focusing spectral...
Emission of muonium (|$\mu ^+e^-$|) atoms from a laser-processed aerogel surface into vacuum was studied for the first time. Laser ablation used to create hole-like regions with diameter about 270 |$\mu $|m in triangular pattern hole separation range 300–500 $|m. The emission probability sample is at least eight times higher than uniform one.
The dependence on laser intensity and pulse duration in energetic proton acceleration by irradiation of ultrashort pulses a 5μm thick copper tape target was measured. varied from 8.5×1017W∕cm2 to 1.1×1019W∕cm2, the 55 fs 400 fs. maximum energy increased as while kept constant. good agreement with an analytical plasma-expanding model.
The results of experiments are presented for the single laser pulse interaction with a very low density gas target, under conditions when generated wake wave is below wave-breaking threshold and power lower than critical relativistic self-focusing. A quasi-monoenergetic electron beam found to be stably various intensity values by controlling acceleration length. two-dimensional particle-in-cell simulations show that an additional mechanism injection into phase required. It demonstrated...
High-flux energetic protons whose maximum energies are up to 4MeV generated by an intense femtosecond titanium:sapphire laser pulse interacting with 7.5, 12.5, and 25μm thick polyimide tape targets. Laser energy of 1.7J a duration 34fs is focused f/3.4 parabolic mirror giving intensity 3×1019Wcm−2. The main amplified spontaneous emission (ASE) contrast ratio 2.5×107. conversion efficiency from the into proton kinetic achieved be ∼3%, which comparable or even higher than those in previous...
A study of proton emission from a 3-μm-thick Ta foil target irradiated by p-, s-, and circularly polarized laser pulses with respect to the plane has been carried out. Protons energies up 880keV were observed in normal direction under irradiation p-polarized pulse, which yielded highest efficiency for emission. In contrast, s- gave maximum 610 680keV, respectively. The difference energy between p- s-polarized cases was associated sheath fields estimated electron spectra.
The energy spectra and angular distributions of hot electrons as well protons emitted from a 3-μm-thick tantalum foil irradiated by 70-fs laser pulse with an intensity ∼1018W∕cm2 are measured. Three electron flows found, in the rear target normal, specular, surface directions. distribution is found to depend on polarization incident light. measured spectrum normal direction can explain generated proton beam.
Abstract The current trends in stimulated Brillouin scattering and optical phase conjugation are overviewed. This report is formed by the selected papers presented “Fifth International Workshop on 2010” Japan. nonlinear properties of based photo-refraction can compensate distortions high power laser systems, they will also open up potentially novel technologies, e.g., stabilization, beam combination, pulse compression, ultrafast shaping, arbitrary waveform generation.
A recently developed ultrafast burst imaging method known as sequentially timed all-optical mapping photography (STAMP) [Nat. Photonics8, 695 (2014)10.1038/nphoton.2014.163] has been shown effective for studying a diverse range of complex phenomena. Its image separation circumvents mechanical and electronic restrictions that traditional methods have long struggled with, hence realizing ultrafast, continuous, burst-type recording at fame rate far beyond what is achievable with conventional...
We demonstrated phase-locking in a laser-diode-array-pumped Nd:YVO₄ laser array (15 emitters) using Talbot cavity. The slab crystal was coated by dielectric material for claddings and formed planar waveguide the vertical mode. To stabilize horizontal mode, periodical thermal lenses were generated controlling heat flow. phase-locked 1.65-W output power, while 2.02 W available standard Two-peak supermode with cavity converted to single peak spatial light modulator. also experimentally...
We report an experimental generation of ns pulsed 121.568 nm Lyman-α radiation by the resonant nonlinear four-wave mixing 212.556 and 845.015 pulses providing a high conversion efficiency 1.7x10-3 with output pulse energy 3.6 μJ achieved using low pressure Kr-Ar mixture. Theoretical analysis shows that this is due to advantage (i) input laser intensities in combination (ii) gas allowing us avoid onset full-scale discharge focus. In particular, under our conditions main mechanism...
In this proceeding, a new proposal aiming to improve the precision of proton Zemach radius will be presented. A circularly polarized laser shed on sample muonic hydrogen in its ground state. By observing maximum muon decay asymmetry during scanning wave length, ground-state hyperfine splitting energy can identified, which is directly related radius.citedupays The by measurement estimated three times better compared PSI experiment. This result contribute solution size puzzle.
An ion spectrometer, composed of a time-of-flight spectrometer (TOFS) and Thomson parabola (TPS), has been developed to measure energy spectra analyze species laser-driven ions. Two spectrometers can be operated simultaneously, thereby facilitate compare the independently measured data combine advantages each spectrometer. Real-time shot-to-shot characterizations have possible with TOFS, ions analyzed TPS. The two show very good agreement maximum proton even for single laser shot. composite...
An intense sub-10 fs Ti:sapphire laser system has been developed for investigating ultrafast nonlinear phenomena. Sub-10 fs, multimillijoule pulses were obtained from a consisting of conventional chirped-pulse amplifier and subsequent pressure-gradient hollow fiber pulse compressor, without any additional amplification. We describe the design performance together with high-order harmonic generation in regime as an example one applications that made possible by using this system.
Abstract J-PARC Muon Facility: MUSE (Muon Science Establishment) is responsible for the inter-university user program and operation, maintenance, construction of muon beamlines, namely D-line, S-line, U-line, H-line, along with source at Materials Life Facility (MLF). In this paper, recent developments are briefly presented.