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  • 1
    Electronic Resource
    Electronic Resource
    Thickness of the layer of high shear radial electric field in JFT-2M H-mode plasmas (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 116-119 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The poloidal rotation velocity profiles both in low-confinement (L) and high-confinement (H) mode measured in JAERI Fusion Torus 2 Modified (JFT-2M) [Phys. Rev. Lett. 65, 1364 (1990)] are compared with H-mode models based on ion orbit loss. The profiles of poloidal rotation velocity measured in L and H modes are consistent with the calculation which consists of ion orbit loss model. The observed dependence of the thickness of the layer of high shear Er on poloidal gyroradius is explained by the radial transport of poloidal rotation velocity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870944
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  • 2
    Electronic Resource
    Electronic Resource
    Edge poloidal rotation profiles of H-mode plasmas in the JFT-2M tokamak (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 2552-2559 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Parameter dependence of the radial structure of edge poloidal rotation is studied with spectroscopic measurements for L- and H-mode plasmas in the JFT-2M tokamak [Y. Miura et al., in Plasma Physics and Controlled Nuclear Fusion Research, Proceedings of the 13th International Conference, Washington 1990 (IAEA, Vienna, 1991), Vol. 1, p. 325]. The poloidal flow is in the electron diamagnetic direction and appears suddenly near the plasma edge at the H-mode transition. The poloidal rotation velocity profile in the H mode has a peak at the separatrix. No critical normalized ion collisionality, ν*i, for the transition of the L to the H mode is observed. The size of the poloidal flow in the H mode has no dependence on the poloidal gyroradius.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860486
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  • 3
    Electronic Resource
    Electronic Resource
    Low-energy neutral particle analysis by a time-of-flight method on JFT-2M (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 3581-3585 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A time-of-flight method is used to measure the energy spectrum of charge exchange atoms emitted from the JFT-2M plasma in the energy range below 1000 eV/amu. The neutral flux is chopped in bunches of about 0.8 μs by a slotted cylinder. The rotating cylinder is driven by a turbomolecular pump. After the flight of 1.5 m the particles are detected by a secondary particle detector. This is an electron multiplier modified from a photomultiplier which can be gated for an intense photon. The signal from the electron multiplier is digitized at a sampling time of 0.2 μs. To get good statistics of the arrival time distribution (ATD), eight or nine ATDs are averaged. Then the energy spectrum of charge exchange neutrals is measured by a 2 ms interval. The fast change (≤2–6 ms) of energy spectra at the L/H and H/L transition is also reported. The average energy defined by ∫E(dΓ/dE)dE/∫(dΓ/dE)dE increases by about 100 eV at the H transition like the increase of the ECE electron temperature at the edge. The neutral flux defined by ∫(dΓ/dE)dE decreases like the divertor Hα/Dα signal. In the energy distribution of the flux, the number of particles whose energy less than about 400 eV decrease by the H transition but those greater than 500 eV do not change or increase. The flux at 200 eV in the H phase is two times lower than that in the L phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141574
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  • 4
    Electronic Resource
    Electronic Resource
    Pressure measurements with a precision of 0.001 ppm in magnetic fields at low temperatures (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 3215-3218 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Pressure measurements made by an ac bridge technique with a precision of 0.001 ppm in magnetic fields at low temperatures using a Straty–Adams type gauge are described. In order to improve the sensitivity and the long-term stability of the bridge system, coaxial cables without dielectric insulator were developed, with a small cable capacitance temperature coefficient of the impedance. This pressure measurement system has a sensitivity of dP/P∼5×10−10 and a long-term stability of dP/P∼2.4×10−9 over 18 h. This is especially useful for measurements such as electric and magnetic susceptibility measurements in magnetic fields at low temperatures requiring a high precision.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144331
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  • 5
    Electronic Resource
    Electronic Resource
    Low-energy neutral particle analysis by a time-of-flight method on JFT-2M (abstract) : Eighth topical conference on high-temperature plasma diagnostics (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 3146-3146 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A time-of-flight method is used to measure the energy spectrum of charge exchange atoms emitted from the JFT-2M plasma in the energy range below 1000 eV/amu. The neutral flux is chopped in bunches of about 0.8 μs by a slotted cylinder. The rotating cylinder is driven by a turbomolecular pump. After the flight of 1.5 m the particles are detected by a secondary particle detector. This is an electron multiplier modified from a photomultiplier which can be gated for an intense photon. The signal from the electron multiplier is digitized at a sampling time of 0.2 μs. To get good statistics of the arrival time distribution (ATD), eight or nine ATDs are averaged. Then the energy spectrum of charge exchange neutrals is measured by a 2 ms interval. The fast change (≤2–6 ms) of energy spectra at the L/H and H/L transition is also reported. The average energy defined by ∫E(dΓ/dE)dE/∫(dΓ/dE)dE increases by about 100 eV at the H transition like the increase of the ECE electron temperature at the edge. The neutral flux defined by ∫(dΓ/dE)dE decreases like the divertor Hα/Dα signal. In the energy distribution of the flux, the number of particles with energy less than about 400 eV decrease by the H transition but those greater than 500 eV do not change or increase. The flux at 200 eV in the H phase is two times lower than that in the L phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141662
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  • 6
    Electronic Resource
    Electronic Resource
    Single-crystal Al growth on Si(111) by low-temperature molecular beam epitaxy (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 1751-1753 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Al films were formed by low temperature molecular beam epitaxy on Si(111) surfaces. The substrates were pretreated in a NH4F solution to obtain a nearly atomically flat surface by anisotropic etching. Planview transmission electron microscopy observation demonstrates that single-crystal Al films are successfully grown on the 7×7 surface structure. Such single-crystal growth is arrested on a disordered or hydrogen-terminated surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109595
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  • 7
    Electronic Resource
    Electronic Resource
    Schottky barrier inhomogeneity caused by grain boundaries in epitaxial Al film formed on Si(111) (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 1057-1059 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Epitaxial Al contacts on Si(111) are fabricated by electron beam evaporation at various substrate temperatures around 250 °C. They are observed by high-resolution transmission electron microscopy. Schottky barrier heights (SBHs) of the contacts are measured using current-voltage and capacitance-voltage methods. In the case of single-crystalline Al film, the SBH does not change and its spatial distribution remains homogeneous up to an annealing temperature of 550 °C. In contrast with this, for an epitaxial Al film containing grain boundaries, the spatial distribution of the SBH becomes inhomogeneous above 400 °C. This is attributed to Si diffusion along the grain boundaries in the Al film.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107715
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  • 8
    Electronic Resource
    Electronic Resource
    Calcium apatite prepared from calcium hydroxide and orthophosphoric acid (1991)
    Springer
    Journal of materials science 2 (1991), S. 51-55 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Abstract Calcium hydroxyapatite has been prepared due to a direct precipitation reaction between 0.3m orthophosphoric acid solution and 0.1 mol calcium hydroxide dispersed in 200 ml water. The effect of the addition rate of the acid solution, reaction temperature and mixing molar Ca/P ratio is examined on the thermal stability and stoichiometry of the precipitates. Optimum conditions for HAp suitable for dense ceramics are derived from the results. The non-stoichiometry is interpreted in terms of the pH profile in the vicinity of the hydroxide particles and the state of the orthophosphate ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00701687
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  • 9
    Electronic Resource
    Electronic Resource
    Evidence for shock wave effect of meteoritic impact (1991)
    Springer
    Shock waves 1 (1991), S. 35-41 
    Details
    ISSN: 1432-2153
    Keywords: Shock waves ; Meteoritic impact ; Hypervelocity impact ; K/T boundary
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics , Technology
    Notes: Abstract There is material evidence for the existence of shock waves generated by meteoritic impact. This is demonstrated by the pressure and temperature dependent formation processes that exist in the memory of constituent minerals. Stishovite of high-pressure type silica mineral can be observed to be a relict of the compression stage of shock impact. Almost all of the silica minerals evolved from shock impact phenomena are α-quartz crystals of a low-temperature type silica polymorph. By using precise measurements of cell parameters and the corresponding calculated density of the quartz crystal grains collected by an ultrasonic cutter method, shocked quartz grains can be interpreted as the principle relict of meteoritic impact from natural impact craters, artificial impact craters and Cretaceous-Tertiary (K/T) boundary samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414866
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  • 10
    Electronic Resource
    Electronic Resource
    Shock metamorphism on the surface of the Moon (1994)
    Springer
    Shock waves 3 (1994), S. 293-298 
    Details
    ISSN: 1432-2153
    Keywords: Agglutinates ; Collision shock ; Collisionless shock ; Energetic particles ; Formation process ; Iron particles ; Shock metamorphism ; Shocked plagioclase ; Shocked silica ; The Moon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics , Technology
    Notes: Abstract The material characteristics of lunar materials are discussed as indicators of shock metamorphism. As lunar materials are subjected to both impact shock modification due to energetic particles formed at locations of collisionless plasma shocks in cosmic space, it is necessary to identify specific features of each process. All types of lunar glasses formed by various impacts under high pressure (∼ 90 GPa) are found as impact glass, ropy glass, agglutinates and brecciated rocks. The agglutinates and iron particles are identified from X-ray diffraction measurements. Fine-grained lunar materials, including the agglutinates and breccias bonded by crystals and glasses due to impact shocks, contain hydrogen and helium from the energetic particles of collisionless shocks. Lunar shocked minerals of plagioclase and silica show anomalous compositions and densities. The shock metamorphism shows evidence for two major impact processes on evolved and primordial lunar surfaces: (1) shocked silica phases with minor Al contents formed from plagioclase-rich primordial crusts of the Moon, and (2) shocked quartz formed by silica-rich target rocks, especially on evolved parts of the Moon. Silica subjected to both impact and energetic particle modification can grow to coarse-grained normal crystals by long existence in vapor plume under high-temperature or after gradual high-temperature evolution, with the result that original effects of the impact process cannot be distinguished.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01415827
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