A5013114699- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Nuclear Physics and Applications
- Superconducting Materials and Applications
- Particle physics theoretical and experimental studies
- Nuclear reactor physics and engineering
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Radiation Therapy and Dosimetry
- Magnetic confinement fusion research
- Gyrotron and Vacuum Electronics Research
- Muon and positron interactions and applications
- Fusion materials and technologies
- Computational Physics and Python Applications
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Nuclear Materials and Properties
- Plasma Diagnostics and Applications
- Graphite, nuclear technology, radiation studies
- Magnetic Properties and Applications
- Nuclear and radioactivity studies
- Pulsed Power Technology Applications
- Nuclear physics research studies
- Photoacoustic and Ultrasonic Imaging
- Atomic and Subatomic Physics Research
Kyoto University
2015-2025
Kyoto University Research Reactor Institute
2010-2018
National Institute of Optics
2013
Electronic Navigation Research Institute
2007
Mitsubishi Electric (Japan)
2002-2007
High Energy Accelerator Research Organization
1999-2003
Keio University
2002
Niigata University
1989-1991
Saitama University
1987-1989
Institute of High Energy Physics
1989
Click to increase image sizeClick decrease sizeKEYWORDS: ADSKUCAFFAG acceleratorspallation neutronsproton beam injectiontungsten target100 MeV protonsneutron multiplicationexternal sourcesustainable nuclear chain reactionsubcritical system
We present the general properties of multihadron final states produced by e+e− annihilation at center-of-mass energies from 52 to 57 GeV in AMY detector KEK collider TRISTAN. Global shape, inclusive charged-particle, and particle-flow distributions are presented. Our measurements compared with QCD+fragmentation models that use either leading-logarithmic parton-shower evolution or QCD matrix elements parton level, string cluster fragmentation for hadronization.Received 20 November...
A key challenge in particle accelerators is to achieve high peak intensity. Space charge particularly strong at lower energy such as during injection and typically limits achievable The beam stacking technique can overcome this limitation by accumulating a where space weaker. In stacking, bunch of particles injected accelerated energy. This continues circulate, while second subsequent bunches are merge into the first. It also allows user cycle acceleration cycles be separated which often...
We present evidence for the non-Abelian nature of QCD from a study multijet events produced in ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ annihilations \ensuremath{\surd}s =50 to 57 GeV AMY detector at KEK storage ring TRISTAN. A comparison three-jet event fraction TRISTAN DESY PETRA shows that coupling strength ${\ensuremath{\alpha}}_{s}$ decreases with increasing ${Q}^{2}$. In addition, measurements angular distributions four-jet show triple-gluon vertex.
We present the charged-particle multiplicity distributions for ${e}^{+}{e}^{\ensuremath{-}}$ annihilation at center-of-mass energies from 50 to 61.4 GeV. The results are based on a data sample corresponding total integrated luminosity of 30 ${\mathrm{pb}}^{\ensuremath{-}1}$ obtained with AMY detector KEK storage ring TRISTAN. deviate significantly modified Poisson and pair distributions, but follow Koba-Nielsen-Olesen scaling well reproduced by LUND parton-shower model.
Three-jet events produced in ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ annihilations are used to provide comparisons between quark and gluon jets. Differences quark-induced gluon-induced jets observed. Quark tend have a more tightly collimated structure than jets, which is reflected the concentration of larger fraction jet's energy near jet axis.
The total cross section for e+e− annihilation into hadrons has been measured CM energies ranging from 50 to 57 GeV. We fit the predictions of standard model these measurements and those at lower energies. mass Z0 boson, MZ, QCD scale parameter, ΛMS, are derived fit. results MZ=88.6−1.8+2.0 GeV/c2, ΛMS=0.15−0.11+0.16
The ratio $R$ of the total cross section for ${e}^{+}{e}^{\ensuremath{-}}$ annihilation into hadrons to lowest-order QED ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ has been measured center-of-mass energies ranging from 50 61.4 GeV. If we allow an overall shift ---4.9%, about 1.5 times our estimated normalization error, results are consistent with standard-model predictions.
The Research Reactor Institute of Kyoto University started the KART (Kumatori Accelerator-driven Test facility) project in fiscal year 2002 under Contract with Ministry Education, Culture, Sports, Science and Technology Japan. purpose this research is to demonstrate basic feasibility accelerator-driven system (ADS), studying effect incident neutron energy on effective multiplication factor a subcritical nuclear fuel system. For purpose, variable-energy FFAG (Fixed Field Alternating Gradient)...
This study demonstrates, for the first time, principle of nuclear transmutation minor actinide (MA) by accelerator-driven system (ADS) through injection high-energy neutrons into subcritical core at Kyoto University Critical Assembly. The main objective experiments is to confirm fission reactions neptunium-237 (237Np) and americium-241 (241Am), capture 237Np. Subcritical irradiation 237Np 241Am foils conducted in a hard spectrum with use back-to-back chamber that obtains simultaneously two...
Proton range uncertainty has been the main factor limiting ability of proton therapy to concentrate doses tumors their full potential. Ionoacoustic (IA) verification is an approach reducing this by detecting thermoacoustic waves emitted from irradiated volume immediately following a pulsed beam delivery; however, signal weakness obstacle its clinical application. To increase signal-to-noise ratio (SNR) with conventional piezoelectric hydrophone (PH), detector-sensitive needs be large, but it...
Click to increase image sizeClick decrease sizeKEYWORDS: ADSKUCAFFAG acceleratorspallation neutronsproton beam injectiontungsten target100 MeV protonsneutron multiplicationexternal sourcesustainable nuclear chain reactionsubcritical system
Abstract In contrast to conventional X-ray therapy, proton beam therapy (PBT) can confine radiation doses tumours because of the presence Bragg peak. However, precision treatment is currently limited by uncertainty in range. Recently, a unique range verification methodology has been proposed based on simulation studies that exploit spherical ionoacoustic waves with resonant frequency (SPIREs). SPIREs are emitted from gold markers initially introduced for accurate patient positioning when...
The lack of double-differential cross-section (DDX) data for neutron production below the incident proton energy 200 MeV hinders validation spallation models in technical applications, such as research and development accelerator-driven systems (ADSs). present study aims to obtain experimental DDX ADS target materials this region identify issues related by comparing them with analytical predictions. DDXs (p,xn) reactions natPb 209Bi 100-MeV were measured over an angular range 30° 150° using...
A three-dimensional electromagnetic field analysis model was developed to estimate ac losses in high-temperature superconductor (HTS) coils composing superferric magnets for rapid-cycling synchrotrons. The influence of magnetized iron yokes the on distributions magnetic flux density HTS considered as externally applied model. We carried out loss calculations using models two having different core and coil geometries. distribution overall were compared.
Two multidimensional Monte Carlo simulation codes—(a) neutral (H2,H) transport code and (b) negative ion (H−) code—have been developed. This article focuses on the recent results by for H− production in a large, hybrid source, “Camembert III.” Two-dimensional spatial profiles of vibrationally excited molecules H2(v) are obtained given background plasma profile. Both ions mainly produced near filaments driver region. However, source density has double peak its structure, while profile is...