Katsunobu Nishihara
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View article: Absolute density measurement of hydrogen radicals in XUV induced plasma for tin contamination cleaning via laser-induced fluorescence
Absolute density measurement of hydrogen radicals in XUV induced plasma for tin contamination cleaning via laser-induced fluorescence Open
Effective cleaning of tin contamination on the collecting mirrors in extreme ultraviolet source is one of the key techniques to improve throughput and cost performance of extreme ultraviolet lithography. Hydrogen radicals produced in hydro…
View article: Dominant factors in grain-boundary fracture phenomena: An atomic simulation study
Dominant factors in grain-boundary fracture phenomena: An atomic simulation study Open
View article: STAR2D simulation and Hydrogen photodissociation cross sections dataset
STAR2D simulation and Hydrogen photodissociation cross sections dataset Open
This dataset consists of two tables: extreme ultraviolet (XUV) and vacuum ultraviolet (VUV) emission spectra from a laser produced, 1 micron wavelength plasma. The emission spectra was calculated from STAR-2D simulation results. The data c…
View article: STAR2D simulation and Hydrogen photodissociation cross sections dataset
STAR2D simulation and Hydrogen photodissociation cross sections dataset Open
This dataset consists of two tables: extreme ultraviolet (XUV) and vacuum ultraviolet (VUV) emission spectra from a laser produced, 1 micron wavelength plasma. The emission spectra was calculated from STAR-2D simulation results. The data c…
View article: Observation of plasma inflows in laser-produced Sn plasma and their contribution to extreme-ultraviolet light output enhancement
Observation of plasma inflows in laser-produced Sn plasma and their contribution to extreme-ultraviolet light output enhancement Open
View article: High-Quality Laser-Accelerated Ion Beams from Structured Targets
High-Quality Laser-Accelerated Ion Beams from Structured Targets Open
In this work, we reviewed our results on the prospect of increasing the quality of ion acceleration driven by high-intensity laser pulses using low-Z structured targets. It is shown that the radiation pressure acceleration mechanism domina…
View article: Discovery of plasma inflows in laser-produced Sn plasmas contributing to increment of extreme-ultraviolet light output
Discovery of plasma inflows in laser-produced Sn plasmas contributing to increment of extreme-ultraviolet light output Open
Plasma dynamics are governed not only by temperature and density but also by macroscopic flows. However, velocity fields ( v flow ) inside laser-produced plasmas (LPPs) have rarely been measured, owing to their small size (< 1 mm) and shor…
View article: Laser-driven generation of collimated quasi-monoenergetic proton beam using double-layer target with interface modulations
Laser-driven generation of collimated quasi-monoenergetic proton beam using double-layer target with interface modulations Open
Usage of double-layer targets consisting of heavy and light material with modulated interface between them provides a way for laser-driven generation of collimated ion beams. With extensive 2D3V PIC simulations we show that this configurat…
View article: Nonlinear interfacial motion in magnetohydrodynamic flows
Nonlinear interfacial motion in magnetohydrodynamic flows Open
View article: 3 × 10<sup>8 </sup>D-D Neutron Generation by High-Intensity Laser Irradiation onto the Inner Surface of Spherical CD Shells
3 × 10<sup>8 </sup>D-D Neutron Generation by High-Intensity Laser Irradiation onto the Inner Surface of Spherical CD Shells Open
3 × 108 deuterium-deuterium (D-D) neutron generation per pulse was achieved with one-sided laser irradiation through an inlet hole of a deuterated polystyrene shell and a laser intensity of (2-3) × 1016 W/cm2. X-ray pinhole camera images d…
View article: Time-resolved two-dimensional profiles of electron density and temperature of laser-produced tin plasmas for extreme-ultraviolet lithography light sources
Time-resolved two-dimensional profiles of electron density and temperature of laser-produced tin plasmas for extreme-ultraviolet lithography light sources Open
View article: A numerical model for investigation of emission of particle debris from laser-irradiated metal targets
A numerical model for investigation of emission of particle debris from laser-irradiated metal targets Open
A simulation model of the hydrodynamics of emission of particle debris from laser ablation is presented. On the basis of a Lagrangian description of the fluid, numerical methods for the placement of a mesh along the distribution of the mat…
View article: Investigation of the ionization balance of bismuth-to-tin plasmas for the extreme ultraviolet light source based on a computer-generated collisional radiative model
Investigation of the ionization balance of bismuth-to-tin plasmas for the extreme ultraviolet light source based on a computer-generated collisional radiative model Open
The ionization balance of the bismuth-to-tin plasmas is systematically investigated on the basis of a collisional radiative model, which has been generated using a computer algorithm to analyze the level structure of multiple charged ions …
View article: Laser ion acceleration and neutron source in short-pulse solid- nanoparticle interaction
Laser ion acceleration and neutron source in short-pulse solid- nanoparticle interaction Open
We propose both an efficient neutron source and an extremely high energy proton source using solid CD and CH nano-particles, respectively, irradiated by an intense laser light. With a use of 3-d PIC simulations, we obtain an optimum CD rad…
View article: Efficient neutron generation from solid-nanoparticle explosions driven by DPSSL-pumped high-repetition rate femtosecond laser pulse
Efficient neutron generation from solid-nanoparticle explosions driven by DPSSL-pumped high-repetition rate femtosecond laser pulse Open
We propose novel neutron source using high-intensity laser based on the cluster fusion scheme. We developed DPSSL-pumped high-repetition-rate 20-TW laser system and solid nanoparticle target for neutron generation demonstration. In our neu…
View article: Nonlinear motion of a current-vortex sheet in MHD Richtmyer-Meshkov instability
Nonlinear motion of a current-vortex sheet in MHD Richtmyer-Meshkov instability Open
Nonlinear motion of a vortex sheet applied an initially homogeneous magnetic field is investigated using the vortex method. We show that the existence of a vortex sheet induces a strong magnetic field and non-uniform current at the fluid i…
View article: Atomic processes and equation of state of high Z plasmas for EUV sources and their effects on the spatial and temporal evolution of the plasmas
Atomic processes and equation of state of high Z plasmas for EUV sources and their effects on the spatial and temporal evolution of the plasmas Open
Laser-produced plasma (LPP) extreme ultraviolet (EUV) light sources have been intensively investigated due to potential application to next-generation semiconductor technology. Current studies focus on the atomic processes and hydrodynamic…
View article: Repetitive Generation of 2.45 MeV Nuclear Fusion Neutron from Deuterated Nano-Sized Particles Irradiated by 20 TW All-Solid-State Laser
Repetitive Generation of 2.45 MeV Nuclear Fusion Neutron from Deuterated Nano-Sized Particles Irradiated by 20 TW All-Solid-State Laser Open
We propose a novel neutron source technique using ultra-high intensity laser based on the cluster fusion scheme. We have developed the high-repetition rate 20 TW ultra-short pulse laser system MATSU-1 pumped by the efficient diode-pumped h…