A5000383631- Nuclear reactor physics and engineering
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Nuclear Materials and Properties
- Radiation Therapy and Dosimetry
- Graphite, nuclear technology, radiation studies
- Nuclear and radioactivity studies
- Nuclear physics research studies
- Particle accelerators and beam dynamics
- Nuclear Engineering Thermal-Hydraulics
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Magnetic confinement fusion research
- Fusion materials and technologies
- Silicon and Solar Cell Technologies
- Geophysical Methods and Applications
- Fusion and Plasma Physics Studies
- Cold Fusion and Nuclear Reactions
- Muon and positron interactions and applications
- Superconducting Materials and Applications
- Fault Detection and Control Systems
- Particle Accelerators and Free-Electron Lasers
- Radioactive contamination and transfer
- Phase Equilibria and Thermodynamics
- Medical Imaging Techniques and Applications
Kyoto University
2015-2024
Kyoto University Research Reactor Institute
2011-2021
National Institute of Advanced Industrial Science and Technology
2003
Click to increase image sizeClick decrease sizeKEYWORDS: ADSKUCAFFAG acceleratorspallation neutronsproton beam injectiontungsten target100 MeV protonsneutron multiplicationexternal sourcesustainable nuclear chain reactionsubcritical system
A Cerenkov fiber-optic dosimeter (CFOD) is fabricated using plastic optical fibers to measure radiation induced by a therapeutic photon beam. We measured the generated in various irradiation conditions evaluate usability of for beam therapy dosimetry. As results, spectral peak was at wavelength 515 nm, and intensity increased linearly with increasing irradiated length fiber. Also, angle range 30 40 deg. In results Monte Carlo N-particle transport code simulations, relationship between fluxes...
In preparation for connecting a Fixed Field Alternating Gradient (FFAG) accelerator atthe Kyoto University Critical Assembly (KUCA), static and kinetic experimental numerical analyses of Accelerator-Driven System (ADS) are envisaged. Improvement source multiplication by the implementation neutron guide is expected to affect characteristics ADS core. The effects on reactivity flux distribution investigated measurements subcriticality reaction rate distributions indium wire, respectively,...
Abstract A series of preliminary experiments on an accelerator-driven subcritical reactor (ADSR) with 14 MeV neutrons were conducted at Kyoto University Critical Assembly (KUCA) the prospect establishing a new neutron source for research. critical assembly solid-moderated and -reflected core was combined Cockcroft-Walton-type accelerator. shield beam duct installed in reflector region directing as large number possible high-energy 14MeV generated by deuteron-tritium (D-T) reactions to fuel...
AbstractAt the Kyoto University Critical Assembly, a series of reactor physics experiments on accelerator-driven system (ADS) coupled with fixed-field alternating gradient (FFAG) accelerator are carried out, and spallation neutrons generated by 100-MeV protons from FFAG successfully injected into cores. In ADS experiments, neutron characteristics solid target investigated through static kinetic analyses, when external source spectrum (the W, W-Be, or Pb-Bi target) is varied. The results...
In this study, we developed a fiber-optic humidity sensor (FOHS) system for the monitoring and detection of coolant leakage in nuclear power plants. The FOHS includes an FOHS, spectrometer, halogen white-light source, Y-coupler. is composed humidity-sensing material, metal tube, multi-mode plastic optical fiber, subminiature version A (SMA) connector. material synthesized from mixture polyvinylidene fluoride (PVDF) dimethyl sulfoxide (DMSO) hydroxyethyl cellulose (HEC) distilled water. We...
Abstract Neutron spectrum experiments on the Accelerator-Driven System (ADS) are conducted by combining a critical assembly of solid-moderated and solid-reflected core with Cockcroft-Walton-type accelerator. Neutrons (14 MeV) generated from accelerator injected into subcritical system reaction rates measured foil activation method to obtain neutronic data. The numerical calculations executed MCNP-4C3 JENDL-3.3 JENDL/D-99 libraries evaluate foils set in center at target. In present study,...
In this research, we propose a novel method for detecting thermal neutrons with fiber-optic radiation sensor using the Cerenkov effect. We fabricate that detects Gd-foil, rutile crystal, and plastic optical fiber. The relationship between fluxes of electrons inducing in probe neutron is determined Monte Carlo N-particle transport code simulations. To evaluate sensor, generated by irradiation pure beams measured according to depths polyethylene.
Sample reactivity experiments on the uncertainty analyses of Pb nuclear data are carried out by substituting Al plates for ones at Kyoto University Critical Assembly, as part basic research Pb–Bi coolant. Numerical simulations sample performed with Monte Carlo calculation code MCNP6.1 together four libraries JENDL-3.3, JENDL-4.0, ENDF/B-VII.0 and JEFF-3.1, to examine accuracy cross-section uncertainties isotopes comparing measured calculated reactivities. A library update from JENDL-3.3...
To investigate the applicability of pulsed neutron source method using a spallation for an on-line subcriticality monitoring system accelerator-driven system, subcritical experiment is conducted Kyoto University Critical Assembly in combination with fixed-field alternating gradient accelerator. Reactivity values obtained from different traditional techniques, area-ratio and α-fitting method, are discussed respect to monitoring. The results show that robustly accurately monitors shallow...
A series of power spectral analyses for a thermal subcritical reactor system driven by pulsed 14 MeV neutron source was carried out at Kyoto University Critical Assembly (KUCA), to determine the prompt-neutron decay constant accelerator-driven (ADS). The cross-power density between time-sequence signal data two detectors composed familiar continuous noise component and many delta-function-like peaks integral multiple pulse repetition frequency. inferred from consistent with that obtained...
Neutron spectrum analyses of spallation neutrons are conducted in the accelerator-driven system (ADS) facility at Kyoto University Critical Assembly (KUCA). High-energy protons (100 MeV) obtained from fixed field alternating gradient accelerator injected onto a tungsten target, whereby generated. For neutronic characteristics neutrons, reaction rates and continuous energy distribution measured by foil activation method an organic liquid scintillator, respectively. Numerical calculations...
At the Kyoto University Critical Assembly, a series of reaction rate experiments is conducted on accelerator-driven system (ADS) with spallation neutrons generated by combined use 100 MeV protons and lead–bismuth target in subcritical state. The rates are measured foil activation method to obtain neutron spectrum information ADS. Numerical calculations performed MCNP6.1 JENDL/HE-2007 for high-energy process, JENDL-4.0 transport JENDL/D-99 rates. That depend subcriticality revealed accuracy...
Nuclear data-induced uncertainties of neutronics parameters (neutron multiplication factor keff, one-point kinetics and prompt neutron decay constant α) are quantified for lead-bismuth zoned accelerator-driven system experiments at the Kyoto University Critical Assembly, in order to contribute validation subcritical core analysis. The random sampling technique using SCALE6.2.1/Sampler/NEWT/PARTISN is utilized uncertainty quantification, because applicable a problem which not easy apply...
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In preparation for connecting a Fixed Field Alternating Gradient (FFAG) accelerator atthe Kyoto University Critical Assembly (KUCA), static and kinetic experimental numerical analyses of Accelerator-Driven System (ADS) are envisaged. Improvement source multiplication by the implementation neutron guide is expected to affect characteristics ADS core. The effects on reactivity flux distribution investigated measurements subcriticality reaction rate distributions indium wire, respectively,...
Abstract Basic research on the Accelerator-Driven System (ADS) with thermal neutron spectrum has been promoted by Kyoto University Research Reactor Institute. At Critical Assembly (KUCA), various experiments ADS a pulsed spallation source are planned. In such an ADS, flux distribution may be sensitive to injection of neutrons, and high sensitivity results in spatial effects. this study, experiment 14MeV neutrons was carried out KUCA, determine λ-mode eigenvalue separation, which is...
Abstract An experimental technique based on an accelerator-beam trip or restart operation is proposed to determine the subcritical reactivity of accelerator-driven system (ADS). Applying least-squares inverse kinetics method data analysis, subcriticality can be inferred from time-sequence neutron count after these operations. A series ofbeam and experiments with 14 MeV neutrons were carried out in a thermal ADS Kyoto University Critical Assembly (KUCA), demonstrate applicability technique....
Basic research on the accelerator-driven system is conducted by combining 235U-fueled and 232Th-loaded cores in Kyoto University Critical Assembly with pulsed neutron generator (14 MeV neutrons) proton beam accelerator (100 protons a heavy metal target). The results of experimental subcriticality are presented wide range level between near critical 10,000 pcm, as obtained source method, Feynman-α multiplication method.