A5014316129- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- High-pressure geophysics and materials
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Laser Design and Applications
- Ion-surface interactions and analysis
- Advanced X-ray Imaging Techniques
- Radiation Therapy and Dosimetry
- Magnetic confinement fusion research
- Laser Material Processing Techniques
- Planetary Science and Exploration
- X-ray Spectroscopy and Fluorescence Analysis
- Particle Accelerators and Free-Electron Lasers
- Solid State Laser Technologies
- Atomic and Subatomic Physics Research
- Plasma Diagnostics and Applications
- Radiation Detection and Scintillator Technologies
- Electron and X-Ray Spectroscopy Techniques
- Fullerene Chemistry and Applications
- Diamond and Carbon-based Materials Research
- Cold Fusion and Nuclear Reactions
- Advanced Optical Sensing Technologies
- Fusion materials and technologies
Osaka University
2015-2024
Institute for Laser Technology
2016-2024
National Institute for Fusion Science
2023
Hiroshima University
2023
National Institutes for Quantum Science and Technology
2023
Utsunomiya University
2023
Japan Science and Technology Agency
2017-2021
Graduate School for the Creation of New Photonics Industries
2009-2017
Nagoya University
2017
Japan Atomic Energy Agency
2007-2016
An approach for accelerating ions, with the use of a cluster-gas target and an ultrashort pulse laser 150-mJ energy 40-fs duration, is presented. Ions 10--20 MeV per nucleon having small divergence (full angle) 3.4\ifmmode^\circ\else\textdegree\fi{} are generated in forward direction, corresponding to approximately tenfold increase ion energies compared previous experiments using solid targets. It inferred from particle-in-cell simulation that high ions at rear side due formation strong...
Human cancer cells are irradiated by laser-driven quasimonoenergetic protons. Laser pulse intensities at the 5×1019 W/cm2 level provide source and acceleration field for protons that subsequently transported four energy-selective dipole magnets. The transport line delivers 2.25 MeV with an energy spread of 0.66 a bunch duration 20 ns. survival fraction in vitro from human salivary gland tumor is measured colony formation assay following proton irradiation dose levels up to 8 Gy, which single...
A kilo-tesla level, quasi-static magnetic field (B-field), which is generated with an intense laser-driven capacitor-coil target, was measured by proton deflectometry a proper plasma shielding. Proton direct and reliable method to diagnose strong, mm3-scale laser-produced B-field; however, this not successful in the previous experiment. target-normal-sheath-accelerated beam deflected Lorentz force resulting deflection pattern recorded on radiochromic film stack. 610 ± 30 T of B-field...
The quest for the inertial confinement fusion (ICF) ignition is a grand challenge, as exemplified by extraordinary large laser facilities. Fast isochoric heating of pre-compressed plasma core with high-intensity short-pulse an attractive and alternative approach to create ultra-high-energy-density states like those found in ICF sparks. This avoids quench caused hot spark mixing surrounding cold fuel, which crucial problem currently pursued scheme. High-intensity lasers efficiently produce...
Abstract Using one of the world most powerful laser facility, we demonstrate for first time that high-contrast multi-picosecond pulses are advantageous proton acceleration. By extending pulse duration from 1.5 to 6 ps with fixed intensity 10 18 W cm −2 , maximum energy is improved more than twice (from 13 33 MeV). At same time, laser-energy conversion efficiency into MeV protons enhanced an order magnitude, achieving 5% above duration. The energies observed discussed using a plasma expansion...
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...
Using a high-contrast (10(10):1) and high-intensity (10(21) W/cm(2)) laser pulse with the duration of 40 fs from an optical parametric chirped-pulse amplification/Ti:sapphire laser, MeV proton bunch is obtained, which record for energy less than 10 J. The efficiency generation protons kinetic above 15 0.1%.
Experiments identify the mechanism that accelerates ions in a laser-driven neutron source (LDNS) as well scaling law for yield, key insights move LDNS closer to practical generation.
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...
A petawatt laser for fast ignition experiments (LFEX) system [N. Miyanaga et al., J. Phys. IV France 133, 81 (2006)], which is currently capable of delivering 2 kJ in a 1.5 ps pulse using 4 beams, has been constructed beside the GEKKO-XII facility demonstrating efficient heating dense plasma up to temperature under auspices Fast Ignition Realization EXperiment (FIREX) project [H. Azechi Nucl. Fusion 49, 104024 (2009)]. In FIREX experiment, cone attached spherical target containing fuel...
Abstract The temperature measurement of material inside an object is one the key technologies for control dynamical processes. For this purpose, various techniques such as laser-based thermography and phase-contrast imaging have been studied. However, it is, in principle, impossible to measure element using these techniques. One possible solutions measurements Doppler brooding effect neutron resonance absorption (NRA). Here we present a method or isotope NRA with single pulse approximately...
Fast protons are observed by a newly developed online time-of-flight spectrometer, which provides shot-to-shot proton-energy distributions immediately after the irradiation of laser pulse having an intensity ∼1018W∕cm2 onto 5-μm-thick copper foil. The maximum proton energy is found to increase when fs prepulse arriving 9ns before main increases from 1014 1015W∕cm2. Interferometric measurement indicates that preformed-plasma expansion at front surface smaller than 15μm, corresponds spatial...
Abstract The scientific and technical advances continue to support novel discoveries by allowing scientists acquire new insights into the structure properties of matter using tools sources. Notably, neutrons are among most valuable sources in providing such a capability. At Institute Laser Engineering, Osaka, first steps taken towards development table-top laser-driven neutron source, capable producing wide range energies with high brightness temporal resolution. By employing pure hydrogen...
Fast isochoric laser heating is a scheme to heat matter with relativistic intensity ($>{10}^{18}\text{ }\text{ }\mathrm{W}/{\mathrm{cm}}^{2}$) pulse for producing an ultrahigh-energy-density (UHED) state. We have demonstrated efficient fast of compressed dense plasma core multipicosecond kilojoule-class petawatt and assistance externally applied kilotesla magnetic fields guiding electrons the plasma. A UHED state 2.2 PPa achieved experimentally 4.6 kJ total energy that one order magnitude...
Abstract Thermal neutron (∼25 meV) beam is a powerful tool for investigating the structure and properties of materials used in science technology. A laser-driven source generating 10 neutrons within 1 ns duration utilized to single shot radiography with dual thermal X-rays. As proof principle, we show non-destructive inspection hazardous substances (Cadmium) contained typical battery, when cadmium anode thickness evaluated from transmittance neutrons. The fact that above performed laser...
Solid-state nuclear track detectors (SSNTDs) are often used as ion in laser-driven acceleration experiments and considered to be the most reliable diagnostics since they sensitive only ions measure one by one. However, pit analyses require tremendous time effort chemical etching, microscope scanning, identification eyes. From a experiment, there typically millions of microscopic images, it is practically impossible analyze all them hand. This research aims improve efficiency automation SSNTD...
In pursuing a carbon-neutral society, inertial fusion energy is pivotal technology, offering sustainable and virtually limitless source. Enhancing plasma heating efficiency crucial for energy, following the ignition success using laser-indirect-drive central-ignition approach at U.S. National Ignition Facility. Fast potentially high-efficiency among confinement methods. However, it remains significantly challenging due to large divergence angle of relativistic electron beams (REBs) produced...
A scheme of the real-time optimization proton production by an intense short-pulse laser interacting with a foil target was developed using time-of-flight measurement plastic scintillator. Owing to special treatments, detection protons scintillation counter has become possible under heavy backgrounds such as light itself, laser-generated hard X-ray, self-emission light, and electrons from laser-produced plasma. With protons, energy spectrum could be obtained shot shot, experimental...
Laser pulse contrast exceeding 1011 was demonstrated on a kilojoule-class petawatt laser for fast ignition experiments (LFEX) system [J. Phys. IV France133, 81 (2006)10.1051/jp4:2006133016] by implementing 2 in. plasma mirror. beams of up to 1.2 kJ striking the mirror with duration 1.5 ps were reflected and focused onto target without significant distortions in focal spot. Transmitted light from reveals that it has high reflectivity before main peak. The estimated at 1 ns No preformed...
We study the one-dimensional expansion of a thin foil plasma irradiated by high intensity laser with multi-picosecond (ps) pulse durations using particle-in-cell simulation. Electrons are found to recirculate around expanding for many times, which results in stochastic heating leading increase electron temperature multi-ps time scale beyond ponderomotive scaling. The conventional isothermal model cannot describe such an plasmas long scale. here developed non-isothermal theory that takes...