Japan Atomic Energy Research Institute

About: Japan Atomic Energy Research Institute is a based out in . It is known for research contribution in the topics: Neutron & Irradiation. The organization has 7707 authors who have published 14471 publications receiving 207688 citations.

Internal transport barrier on q=3 surface and poloidal plasma spin up in JT-60U high- beta p discharges.

Abstract: Spontaneous formation of an internal transport barrier was observed associated with improved confinement in the high-${\mathrm{\ensuremath{\beta}}}_{\mathit{p}}$ discharges in the JT-60U tokamak. The radial location of the transport barrier was found to be on the q=3 surface. A fast magnetohydrodynamic event localized at the transport barrier triggered the subsequent formation of an edge transport barrier that resulted in the further confinement improvement. In these discharges, a high poloidal rotation velocity that significantly exceeded the prediction of the present neoclassical theory was also observed at r/a=0.8.

Monoclinic structure of unpoled morphotropic high piezoelectric PMN-PT and PZN-PT compounds

Abstract: Evidences of a monoclinic phase in unpoled $({\mathrm{PbMg}}_{1/3}{\mathrm{Nb}}_{2/3}{\mathrm{O}}_{3}{)}_{1\ensuremath{-}x}\ensuremath{-}({\mathrm{PbTiO}}_{3}{)}_{x}$ with $x=035$ (PMN-PT 35%) and unpoled $({\mathrm{PbZn}}_{1/3}{\mathrm{Nb}}_{2/3}{\mathrm{O}}_{3}{)}_{1\ensuremath{-}x}\ensuremath{-}({\mathrm{PbTiO}}_{3}{)}_{x}$ with $x=009$ (PZN-PT 9%) are presented from a neutron Rietveld analysis This monoclinic phase is different from the phase recently evidenced by Noheda and co-workers in ${\mathrm{PbZr}}_{1\ensuremath{-}x}{\mathrm{Ti}}_{x}{\mathrm{O}}_{3}$ with $x=048$ [B Noheda et al, Phys Rev B 61, 8687 (2000)] but is identical to the phase observed in poled PZN-PT with $x=008$ [B Noheda et al, Phys Rev Lett 86, 3891 (2001)] by the same authors The structural resolutions allowed us to compare both structures and to deduce the direction and magnitude of polarization In PMN-PT 35% and PZN-PT 9% this phase is characterized by a weak value of polarization, a strong deformation of oxygen polyhedra, and weak cationic shifts

Endohedral Clusterization of Ten Water Molecules into a “Molecular Ice” within the Hydrophobic Pocket of a Self-Assembled Cage

Abstract: An adamantanoid (H2O)10 cluster is formed within the hydrophobic cavity of a self-assembled coordination cage. This cluster is termed “molecular ice” because it is the smallest unit of naturally occurring Ic-type ice. X-ray structural analysis, coupled with neutron diffraction study, reveals that the molecular ice is formed not by a simple space-filling effect but by efficient molecular recognition within the cage via H2O:···π interaction.

Relativistic nuclear collisions at 10A GeV energies from p+Be to Au+Au with the hadronic cascade model

Abstract: A hadronic cascade model based on resonances and strings is used to study mass dependence of relativistic nuclear collisions from p+Be to Au+Au at AGS energies ({approx}10A GeV) systematically. Hadron transverse momentum and rapidity distributions obtained with both cascade calculations and Glauber-type calculations are compared with experimental data, leading to a detailed discussion concerning the importance of rescattering among hadrons. We find good agreement with the experimental data without any change of model parameters with the cascade model. It is found that rescattering is of importance both for the explanation of the high transverse momentum tail and for the multiplicity of produced particles. (c) 1999 The American Physical Society.

Internal Transport Barrier for Electrons in JT-60U Reversed Shear Discharges

Abstract: A new type of internal transport barrier (ITB) has been observed in JT-60U reversed shear discharges. It accompanies clear electron temperature and density pedestals and significant reduction of effective thermal diffusivities of electrons and ions ( ${\ensuremath{\chi}}_{e}^{\mathrm{eff}}$ and ${\ensuremath{\chi}}_{i}^{\mathrm{eff}}$); ${\ensuremath{\chi}}_{e}^{\mathrm{eff}}$ sharply drops by a factor of 20 within 5 cm while ${\ensuremath{\chi}}_{i}^{\mathrm{eff}}$ is smaller than the conventional neoclassical value by a factor of 4 or more. The ratio of ion temperature to electron temperature was less than 1.5 inside the ITB. The ITB lies in the negative shear region and extended beyond 60% of the plasma minor radius. High density plasmas with high confinement have been obtained with the formation of ITB.