A5039818107- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Laser-Matter Interactions and Applications
- High-pressure geophysics and materials
- Ion-surface interactions and analysis
- Radiation Therapy and Dosimetry
- Laser Material Processing Techniques
- Particle Accelerators and Free-Electron Lasers
- Diamond and Carbon-based Materials Research
- Particle accelerators and beam dynamics
- Laser Design and Applications
- Atomic and Subatomic Physics Research
- Plasma Diagnostics and Applications
- Electrostatic Discharge in Electronics
- Nuclear Physics and Applications
- Advanced Surface Polishing Techniques
- Radiation Effects and Dosimetry
- Engineering Applied Research
- Plant tissue culture and regeneration
- Stellar, planetary, and galactic studies
- Dark Matter and Cosmic Phenomena
- Berry genetics and cultivation research
- Astro and Planetary Science
- Clinical Laboratory Practices and Quality Control
- Surface Roughness and Optical Measurements
National Institutes for Quantum Science and Technology
2017-2022
Osaka University
2015
Japan Atomic Energy Agency
2008-2014
The laser-driven acceleration of high quality proton beams from a double-layer target, comprised high-$Z$ ion layer and thin disk hydrogen, is investigated with three-dimensional particle-in-cell simulations for an obliquely incident laser pulse. beam energy reaches its maximum at certain incidence angle, where it can be much greater than the normal incidence. propagates some angle respect to target surface tilt around surface, as determined by angle.
We investigate theoretically and with three-dimensional particle-in-cell simulations high-quality laser proton acceleration for oblique incidence of the high intensity pulse on a double-layer target. The target is composed high-Z ion layer coated by thin narrow hydrogen patch. highest energy gain achieved at certain angle which fast maximum much greater than case normal incidence. protons form tilted bunch propagates some respect to surface, as determined angle.
We investigate proton acceleration by a laser pulse obliquely incident on double layer target via 3D PIC simulations. It is found that the beam energy spread changes irradiation position and it reaches minimum at certain position. This provides way to control spectrum. show appropriately adjusting size of second high protons with much smaller can be obtained.
The ion acceleration by a hundred TW laser pulse irradiating double-layer target is examined using three-dimensional particle-in-cell simulations. For sufficiently high charge-to-mass ratio in the first layer of target, strongly inhomogeneous expansion occurs due to its Coulomb explosion and onset radiation pressure dominant regime. time-varying electric potential inhomogeneously expanding cloud efficiently accelerates protons. Using optimum material for incidence angle one can obtain...
ニガウリの雌性型系統を種子親とした青中長系の一代雑種‘熊研BP1号’を育成し，半促成，早熟および抑制栽培における作型適応性を検討した．本品種は各作型において安定した多雌花性を表現し，特に，対照品種‘えらぶ’の雌花節率が低下した抑制栽培の生育後期においても高い雌花節率を維持した．収量は半促成および早熟栽培では‘えらぶ’に比べてやや多く，抑制栽培では約50％多かった．雌性型を種子親とする一代雑種の有利性がニガウリの育種において確かめられた．なお，本品種は生育初期に雄花が少ないため，受粉のための花粉用個体が必要である．
Ion acceleration using a laser pulse irradiating disk target that includes hydrogen and carbon is examined three-dimensional particle-in-cell simulations. It shown over 200 MeV protons can be generated 620 TW, 5 × 1021 W/cm2 pulse. In polyethylene (CH2) target, ions separate form two layers by radiation pressure acceleration. A strong Coulomb explosion in this situation repulsion between each layer generates high energy protons. doped consisting of low density within becomes double comprised...
Proton acceleration by using a 620 TW, 18 J laser pulse of peak intensity 5×1021 W/cm2 irradiating disk target is examined three-dimensional particle-in-cell simulations. It shown that protons are accelerated efficiently to high energy for “light” material in the first layer double-layer target, because strongly inhomogeneous expansion occurs Coulomb explosion within such material. Moreover, large movement produced radiation-pressure-dominant acceleration. A time-varying electric potential...
We examine ion acceleration by irradiating a hundred TW laser pulse on double-layer target. It is shown analytically and three-dimensional particle-in-cell simulations that higher energy protons are obtained using material with high charge-to-mass ratio in the first layer of target, because strong Coulomb explosion occurs such material. As result, keep accelerating for longer time. Using optimal conditions it quality can be generated.
In proton acceleration by a laser pulse obliquely incident on double layer target, it is shown PIC simulations that the energy spread of generated protons can be reduced irradiating to off‐center position target. This provides way control spectrum. High are found come from an area shifted initial target center towards propagation direction pulse. We show high with much smaller obtained appropriately adjusting size and second layer.
We investigate high quality laser proton acceleration with three dimensional particle‐in‐cell simulations for oblique incidence of the pulse on a double‐layer target. The target is composed high‐Z ion layer coated by thin and narrow hydrogen patch. highest energy gain achieved at certain angle which fast maximum much grater than case normal incidence. protons form tilted bunch propagates some respect to surface, as determined angle.
Ion acceleration using a laser pulse irradiating thin disk target is examined three-dimensional and two-dimensional particle-in-cell simulations. A of 620 TW, with an intensity 5×1021 W/cm2 duration 27 fs, irradiated on to double-layer target. Simulations are performed by varying the ion density, i.e., electron first layer fixed areal mass density. It shown that obtained proton energy increases dramatically for certain density layer, which made material having small over charge ratio,...
We observed a preformed plasma of an aluminum slab target produced by high-intensity Ti:sapphire laser. The expansion length the at electron density 3 × 1018 cm−3, which was detection limit, around 100 μm measured with laser interferometer. In order to characterize quantitatively and control plasmas, we perform two-dimensional hydrodynamic simulation. almost same as experimental result, if assumed that amplified spontaneous emission lasted 3.5 ns before main pulse arrived.