Tatsumi Hioki
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View article: Changes in the structure and composition of nano-sized Ni-Cu multilayer films with increasing temperature in an atmosphere with and without hydrogen
Changes in the structure and composition of nano-sized Ni-Cu multilayer films with increasing temperature in an atmosphere with and without hydrogen Open
For a system of a nano-sized Ni-Cu multilayer on a Ni substrate and hydrogen gas, many experimental results suggest an anomalous heat release that may be caused by low-energy nuclear reactions in condensed matter. In this paper, to clarify…
View article: Direct fast heating efficiency of a counter-imploded core plasma employing a laser for fast ignition experiments (LFEX)
Direct fast heating efficiency of a counter-imploded core plasma employing a laser for fast ignition experiments (LFEX) Open
Fast heating efficiency when a pre-imploded core is directly heated with an ultraintense laser (heating laser) was investigated. ‘Direct heating’ means that a heating laser hits a pre-imploded core without applying either a laser guiding c…
View article: Ten hertz bead pellet injection and laser engagement
Ten hertz bead pellet injection and laser engagement Open
A laser inertial fusion energy (IFE) reactor requires repetitive injection of fuel pellets and laser engagement to fuse fusion fuel beyond a few Hz. We demonstrate 10 Hz free-fall bead pellet injection and laser engagement with γ-ray gener…
View article: Direct Heating of Counter Imploded Core
Direct Heating of Counter Imploded Core Open
This study investigates the heating efficiency of the fast heating when the imploded core is directly illuminated with an ultraintense laser. Six counterbeams of the GEKKO XII (GXII) green laser at the Institute of Laser Engineering (ILE),…
View article: Estimation of electricity storage capacity of compact SMESs composed of stacks of Si-wafers loaded with superconducting thin film coils in spiral trenches formed by MEMS process
Estimation of electricity storage capacity of compact SMESs composed of stacks of Si-wafers loaded with superconducting thin film coils in spiral trenches formed by MEMS process Open
A method to estimate the electricity storage capacity of our compact superconducting magnetic energy storage system composed of stacks of Si-wafers loaded with superconducting thin film coils in spiral trenches formed by MEMS process was d…
View article: Replacement of NbN by YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> in superconducting thin film coil in a spiral trench on a Si-wafer for compact SMESs
Replacement of NbN by YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> in superconducting thin film coil in a spiral trench on a Si-wafer for compact SMESs Open
To improve the energy storage volume density of our concept of a compact superconducting magnetic energy storage system, replacement of superconducting material NbN for the thin film coil in the spiral trench on a Si wafer by a high temper…
View article: Complete Fabrication of a Traversable 3 µm Thick NbN Film Superconducting Coil with Cu plated layer of 42m in Length in a Spiral Three-Storied Trench Engraved in a Si Wafer of 76.2 mm in Diameter Formed by MEMS Technology for a Compact SMES with High Energy Storage Volume Density
Complete Fabrication of a Traversable 3 µm Thick NbN Film Superconducting Coil with Cu plated layer of 42m in Length in a Spiral Three-Storied Trench Engraved in a Si Wafer of 76.2 mm in Diameter Formed by MEMS Technology for a Compact SMES with High Energy Storage Volume Density Open
Based on the concept of a novel approach to make a compact SMES unit composed of a stack of Si wafers using MEMS process proposed previously, a complete fabrication of a traversable 3 µam thick NbN film superconducting coil lined with Cu p…
View article: Fast heating of fuel assembled in a spherical deuterated polystyrene shell target by counter-irradiating tailored laser pulses delivered by a HAMA 1 Hz ICF driver
Fast heating of fuel assembled in a spherical deuterated polystyrene shell target by counter-irradiating tailored laser pulses delivered by a HAMA 1 Hz ICF driver Open
Fast heating is a method of heating an assembled high-density plasma into a hot state by irradiating it with short-duration (sub-picosecond), high-intensity ($>$ $10^{18}$ W ${\\rm cm}^{-2}$ ) laser pulses before the plasma expands and dis…
View article: Stress control of reactively sputtered thick NbN film on Si wafer changing the location of the substrate Si wafer against the Nb target on a magnetron cathode
Stress control of reactively sputtered thick NbN film on Si wafer changing the location of the substrate Si wafer against the Nb target on a magnetron cathode Open
We have been developing a superconducting NbN thin film coil in a spiral trench on a Si-wafer using MEMS technology. Connecting the coils on the different wafers using waferbonding process, a cylindrical wafer stack is to be formed as a un…
View article: Direct heating of a laser-imploded core using ultraintense laser LFEX
Direct heating of a laser-imploded core using ultraintense laser LFEX Open
A CD shell was preimploded by two counter-propagating green beams from the GEKKO laser system GXII (based at the Institute of Laser Engineering, Osaka University), forming a dense core. The core was predominantly heated by energetic ions d…
View article: Amorphous nanostructuralization in HOPG by 10<sup>14</sup>W cm<sup>-2</sup>laser
Amorphous nanostructuralization in HOPG by 10<sup>14</sup>W cm<sup>-2</sup>laser Open
This reports provide an amorphous nanostructuralization technique on the surface modification in Highly Oriented Pyrolytic Graphite (HOPG) by using a femtosecond laser. We showed, for the first time, that the surface of HOPG is changed to …
View article: Upgrade of repetitive fast-heating fusion driver HAMA to implode a shell target by using diode pumped solid state laser
Upgrade of repetitive fast-heating fusion driver HAMA to implode a shell target by using diode pumped solid state laser Open
The HAMA is 1-Hz fast heating fusion driver pumped by a 10 J second-harmonic of diode-pumped Nd:glass laser: KURE-1. We have upgraded HAMA to realize an implosion of spherical shell target by using a remaining fundamental beam from KURE-1.…
View article: Target Monitoring and Plasma Diagnosis using 2<i>ω</i>probe beam for CANDY
Target Monitoring and Plasma Diagnosis using 2<i>ω</i>probe beam for CANDY Open
We have developed the shadowgraph and interferometer with second-harmonic of heating pulses laser to observe target and plasma in highly-repetitive fusion reaction experiments. In the deuterated polystyrene ((C8D8)n double foil experiment,…
View article: Progress toward a unified kJ-machine CANDY
Progress toward a unified kJ-machine CANDY Open
To construct a unified experimental machine CANDY using a kJ DPSSL driver in the fast-ignition scheme, the Laser for Fast Ignition Experiment (LFEX) at Osaka is used, showing that the laser-driven ions heat the preimploded core of a deuter…
View article: Repetitive Solid Spherical Pellet Injection and Irradiation toward the Repetitive-mode Fast-Ignition Fusion miniReactor CANDY.
Repetitive Solid Spherical Pellet Injection and Irradiation toward the Repetitive-mode Fast-Ignition Fusion miniReactor CANDY. Open
Pellet injection and repetitive laser illumination are key technologies for realizing inertial fusion energy[1-4]. Neutron generator using lasers also requires a repeating pellet target supplier. Here we present the first demonstration of …
View article: Multilayered polycrystallization in single-crystal YSZ by laser-shock compression
Multilayered polycrystallization in single-crystal YSZ by laser-shock compression Open
A single shot of an ultra-intense laser with 0.8 J of energy and a pulse width of 110 fs (peak intensity of W cm−2) is divided into two beams and the two beams counter-irradiated onto a 0.5 mm-thick single crystal yttria-stabilized zirconi…
View article: Direct Heating of a Laser-Imploded Core by Ultraintense Laser-Driven Ions
Direct Heating of a Laser-Imploded Core by Ultraintense Laser-Driven Ions Open
A novel direct core heating fusion process is introduced, in which a preimploded core is predominantly heated by energetic ions driven by LFEX, an extremely energetic ultrashort pulse laser. Consequently, we have observed the D(d,n)^{3}He-…