A5022067620- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- High-pressure geophysics and materials
- Laser-Matter Interactions and Applications
- Magnetic confinement fusion research
- Atomic and Molecular Physics
- Radical Photochemical Reactions
- Radioactive contamination and transfer
- Laser Design and Applications
- Inertial Sensor and Navigation
- Nuclear Physics and Applications
- Catalytic C–H Functionalization Methods
- Geophysics and Gravity Measurements
- Plasma Diagnostics and Applications
- Graphite, nuclear technology, radiation studies
- Nuclear and radioactivity studies
- Sulfur-Based Synthesis Techniques
- Fluorine in Organic Chemistry
- Ionosphere and magnetosphere dynamics
- Oxidative Organic Chemistry Reactions
- Electromagnetic Launch and Propulsion Technology
- Electronic and Structural Properties of Oxides
- Cardiac, Anesthesia and Surgical Outcomes
- Ion-surface interactions and analysis
- Indoor and Outdoor Localization Technologies
Osaka University
1991-2023
Gifu Pharmaceutical University
2018-2023
Kanagawa University
2023
National Institute for Fusion Science
2023
Hiroshima University
2023
National Institutes for Quantum Science and Technology
2023
Utsunomiya University
2023
Fusion Academy
2022
Fusion (United States)
2022
Kyoto University
2021
The simultaneous observations of a beat-wave-excited plasma wave and energetic electrons are reported. A is excited when the beat-wave frequency laser with two wavelengths 10.6 9.57 \ensuremath{\mu}m equals frequency. Stokes sideband measurement gives amplitude \ensuremath{\delta}n/${\mathit{n}}_{0}$ \ensuremath{\sim}5%. Plasma energies more than 10 MeV observed at resonant density.
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...
Supragingival plaque is permanently in contact with saliva. However, the extent to which microbiota contributes salivary bacterial population remains unclear. We compared compositional shift that supragingival following periodontal therapy. Samples were collected from 19 patients periodontitis before and after therapy (mean sample collection interval, 25.8±2.6 months), their composition was investigated using barcoded pyrosequencing analysis of 16S rRNA gene. Phylogenetic community UniFrac...
A comparison of national surveys on oral health suggested that the population South Korea has a better periodontal status than Japan, despite their similar inherent backgrounds. Here, we investigated differences in bacterial assemblages between individuals from those two countries. To exclude potential effects condition microbiota, selected 52 Korean and 88 Japanese orally healthy adults (aged 40–79 years) participants cohort studies, Yangpyeong study Hisayama Japan compared salivary...
Although organic-based photocatalysts provide an inexpensive, environmentally friendly alternative, many are incapable of absorption within the visible wavelength range; this ultimately influences their effectiveness. Photocatalytic reactions usually proceed via single electron transfer (SET) or energy (ET) processes from photoexcited molecules to various substrates. In our study, carbohalogenation olefins was accomplished by combining CBr4 and 4-Ph-pyridine under irradiation. The atom...
This study investigates the photoinduced C-X borylation reaction of aryl halides by forming a halogen-bonding (XB) complex using 2-naphthol as an XB acceptor. The method is chemoselective and broadly functional group tolerant provides concise access to corresponding boronate esters. Mechanistic studies reveal that between halide naphthol acts electron donor-acceptor furnish radicals through transfer.
Objectives: This study examined the in situ expression of receptor activator nuclear factor‐κB ligand (RANKL), (RANK), osteoprotegerin, interleukin‐1β (IL‐1β) and tumor necrosis factor α (TNFα) osteoclasts rat periodontal tissue. Background: In disease, cause resorption alveolar bone. The function is regulated by interaction with ligament cells (PDLs). Furthermore, various kinds molecules such as RANKL, RANK, IL‐1β TNFα are known to be related differentiation function. It therefore important...
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...
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...
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...
Recent progress in the generation laboratory of a strong ($>100$-T) magnetic field enables us to investigate experimentally unexplored magnetohydrodynamics phenomena high-energy-density plasma, which an external 200--300 T notably affects due anisotropic thermal conduction, even when pressure is much lower than plasma pressure. The reduces electron conduction across lines because Larmor radius electrons shorter mean free path electrons. velocity thin polystyrene foil driven by intense...
Magnetic reconnection in a relativistic electron magnetization regime was observed laboratory plasma produced by high-intensity, large energy, picoseconds laser pulse. conditions realized with laser-driven several kilotesla magnetic field is comparable to that the accretion disk corona of black hole systems, i.e., Cygnus X-1. We particle energy distributions outflow jets, which possess power-law component high-energy range. The hardness spectra could explain hard-state x-ray emission from...
Abstract Herein, we describe a photocatalyzed atom‐transfer radical addition (ATRA) reaction using heteroleptic copper(I) complex bearing bipyridyl‐based NN ligand and 2,2′‐bis(diphenylphosphino)‐1,1′‐binaphthyl (BINAP) based PP ligand. The selected was [Cu(BINAP)(cup)](PF 6 ), which used because of its intense absorption in the visible region long excited‐state lifetime. reported copper reactions olefins with carbon tetrabromide afford products moderate‐to‐excellent yields under irradiation...
Ablative Rayleigh-Taylor instability growth was investigated to elucidate the fundamental physics of thermal conduction suppression in a magnetic field. Experiments found that unstable modulation is faster an external This result reproduced by magnetohydrodynamic simulation based on Braginskii model electron transport. An field reduces across lines because Larmor radius electrons much shorter than temperature scale length. Thermal leads spatially nonuniform pressure and reduced ablative...
The irradiation of halogen-bonded complexes with light leads to the homolysis carbon–halogen bonds and formation corresponding carbon radical species. However, only methodology reported for these halogen-bonding is using CBr4 as halogen-bond donor its applicability great interest. In this study, atom transfer addition (ATRA) reaction olefins bromomalonates donors was developed. Using 4-phenylpyridine acceptor, desired proceeded well under external 380 nm furnish ATRA product. effective in...
α-Trifluoromethyl ketones are versatile building blocks for the synthesis of various trifluoromethyl-functionalized molecules. Although there significant advantages in development methods toward direct transformations styrenes into α-trifluoromethyl ketones, most procedures leading to require heavy- or transition-metal-based complexes. Herein, a novel method is developed via anthraquinone-catalyzed photooxidative keto-trifluoromethylation with readily available Langlois reagent (CF3SO2Na)...
Abstract Increasing the laser energy absorption into energetic particle beams represents a longstanding quest in intense laser-plasma physics. During interaction with matter, part of is converted relativistic electron beams, which are origin secondary sources ions, γ-rays and neutrons. Here we experimentally demonstrate that using multiple coherent beamlets spatially temporally overlapped, thus producing an interference pattern focus, significantly improves conversion efficiency hot...
Abstract The dependence of the mean kinetic energy laser-accelerated relativistic electrons (REs) on laser intensity, so-called ponderomotive scaling, explains well experimental results to date; however, this scaling is no longer applicable multi-picosecond (multi-ps) experiments. Here, production REs was experimentally investigated via multi-ps laser–plasma-interaction (LPI). lower slope temperature shows little pulse duration and close value, while higher appears be affected by duration....
We have developed a photochemical ATRA/ATRC reaction that is mediated by halogen bonding interactions. This caused the of malonic acid ester derivatives containing bromine or iodine with unsaturated compounds such as alkenes and alkynes in presence diisopropylethylamine under visible light irradiation. As result various control experiments, it was found formation complexes between amines halogens halogen-bonding interaction occurs system, followed cleavage carbon-halogen bonds light,...
For high repetition ultrahigh-intensity laser system, automatic alignment of structured target is key to achieving consistent particle acceleration and plasma heating. In this work, we demonstrate efficient electron with two sequential steps processing using a rate, 30-fs laser. The first pulse does machining creates steep cylindrical crater on the surface flat stainless-steel target. formed by hydrodynamic expansion heated spallation inner, deeper material nonthermal relativistic electrons....
Laser experiments are becoming established as tools for astronomical research that complement observations and theoretical modeling. Localized strong magnetic fields have been observed at a shock front of supernova explosions. Experimental confirmation identification the physical mechanism this observation great importance in understanding evolution interstellar medium. However, it has challenging to treat interaction between hydrodynamic instabilities an ambient field laboratory. Here, we...