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  • 1
    Electronic Resource
    Electronic Resource
    Measurements of x-ray emission from photoabsorption-edge transition radiation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 4300-4307 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This article describes the measurements of x-ray power, spatial, and spectral distributions from transition radiators whose spectra are narrowed by the foil material's K-shell photoabsorption edge. We used two foil stacks, one composed of 10 foils of 2-μm-thick titanium and the other composed of 18 foils of 2-μm-thick copper. The x-ray flux produced by a foil stack was compared with the flux produced by a single foil of equivalent thickness. The Ross-filter technique was used for measuring the magnitude of the flux within specific energy bands, 1.56–4.96 keV, and 4.96–9.66 keV. The maximum flux from the titanium radiator was 4.8 mW. The maximum flux from the copper radiator was 3.6 mW. In addition both the flux distribution as a function of photon energy and the spatial flux distribution of the titanium radiator were measured. The x-ray emission was measured by pulse height analysis to be between 3.8 and 6 keV. The spatial measurements showed the x rays to be emitted in an annular cone with angular divergence of approximately 5 mrad. These measurements compared well with calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352192
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  • 2
    Electronic Resource
    Electronic Resource
    A new model of magnetostrictive "jumps'' in twinned Terfenol-D (abstract) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6179-6179 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new three dimensional model is set up for interpreting the magnetostrictive "jumps'' in Terfenol-D compressed along the [112¯] or magnetically heat treated perpendicular to the [112¯]. This model considers the combined effects of magnetic anisotropy, stress, and magnetic field. It assumes no domain interaction and separates the magnetizing process of such Terfenol into three steps: (a) 180° domain wall movements at low applied H; (b) three dimensional domain rotations at high H; (c) non-180° domain wall movements at higher H. The magnetostrictions along the three orthogonal directions of [111], [112¯], and [11¯0] in Terfenol Tb0.3Dy0.7Fe1.9 compressed along the [112¯] are calculated. The ratios of these to the saturated [111] magnetostriction of single crystalline Terfenol are 0, 0, 0 at the end of (a); −4/3, 5/6, 1/2 at the end of (b); −4/3, 4/3, 0 at the near end of (c), respectively. These data are consistent with our measurements and others.1
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352689
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  • 3
    Electronic Resource
    Electronic Resource
    The ultraviolet photolysis of acetyl and propionyl radicals studied by infrared emission spectroscopy (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 5943-5946 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photodissociation of acetyl and propionyl radicals at 248 and 266 nm has been studied by time-resolved Fourier transform infrared spectroscopy. A vibrationally excited product CO(v≤8) was observed in the emission spectra. The vibrational temperatures of the nascent CO products were about 7400 K for the acetyl radical and 6930 K for the propionyl radical. The vibrational energy partitioning of the CO fragments fits a soft impulsive model. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473259
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  • 4
    Electronic Resource
    Electronic Resource
    Measurements of x-ray emission from zinc and molybdenum transition radiators (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5152-5157 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This article describes the measurements of x-ray power, spatial and spectral distributions from transition radiators whose spectra are narrowed by the foil material's K-shell photoabsorption edge. We used two foil stacks, one composed of 15 foils of 3-μm-thick Zn and the other composed of 15 foils of 4-μm-thick Mo. At low average currents, the x-ray spectrum produced by transition radiation was measured by pulse height analysis to be between 5 and 9.7 keV for the Zn radiator and between 10 and 20.0 keV for the Mo radiator. These measurements compared well with calculations. The x-ray spatial distribution from the Zn radiator was measured using a silicon linear diode array. The x rays generated by the Zn radiator were found to be emitted in a forward-directed cone with half angle of ∼1.9 mrad with the center of the expected annulus filled. The power density in the peak of the annulus was found to be 50 mW/(mA cm2). At a high average electron-beam current of 12.5 μA, the x-ray power produced by a stack of ten Zn foils was measured in the spectral range between 5 and 9.66 keV to be 1.54 mW with the peak power in the 1 μs macropulse to be 8.5 W. Electron-beam energies between 249 and 282 MeV were used in these experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353790
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  • 5
    Electronic Resource
    Electronic Resource
    Strain tolerance of Bi2Sr2Ca1Cu2O8−δ/Ag composites at high field (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 4392-4397 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Strain tolerance of Bi2Sr2Ca1Cu2O8−δ/Ag composites have been studied at fields up to 20 T and bending strains up to 2.6% in order to determine the factors that control the critical current density. The goal is to find the best way to distribute Ag such as to give both high strain tolerance and high critical current density. Partial melt processed samples prepared from micromilled mixtures containing 30% Ag by volume show a gradually decreasing critical current all the way out to 2.6% strain. Samples typically show about 1000 A/cm2 at 4.2 K, 20 T, and 0.75% strain. At 20 K, these values occur at 4 T and 0.75% strain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349121
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  • 6
    Electronic Resource
    Electronic Resource
    Single photon avalanche diode for single molecule detection (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 1524-1529 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A commercially available single photon avalanche photodiode in a passively quenched circuit is used with time-correlated single photon counting modules to achieve subnanosecond time response together with high quantum efficiency and low dark noise. These characteristics are required for experiments in single molecule detection and spectroscopy in which time-gated detection schemes are used. By tightly focusing the input light onto the active area, a quantum efficiency of over 50% and a single photon timing jitter of 168 ps full width at half-maximum are achieved. In addition, the full width at one-hundredth maximum, which is of greater importance for time gating, is 790 ps, comparable to that from a microchannel plate photomultiplier. Measurements of the detector dead time, and the quantum efficiency, dark counts, time response, and pulse height distribution for different operating conditions are also reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144463
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  • 7
    Electronic Resource
    Electronic Resource
    Nonlinear behavior of magnetic surface waves on the interface between ferromagnet and antiferromagnet (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 1908-1913 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this article the nonlinear frequency characteristics of the transverse magnetic surface waves at microwave frequencies on the interface between a ferromagnet and an antiferromagnet have been studied. The results show that the magnetic surface waves have passband(s) and stopband(s), which are interchangeable through the variation of the wave power. It is shown that the nonlinear surface waves excited on the interface can be backward surface waves with group velocities opposite to their phase velocities in direction. The passband widths of the forward surface waves are about five times larger than those of the backward surface waves in the situation. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372111
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  • 8
    Electronic Resource
    Electronic Resource
    Strain tolerance of doctor-blade-processed Bi2Sr2Ca1Cu2O8−δ tapes (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6966-6969 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The strain tolerance of doctor blade tapes of the high-temperature superconductor Bi2Sr2Ca1Cu2O8−δ have been studied to determine the suitability of these materials for magnet conductors. Critical currents that are on the order of 150 000 A/cm2 in zero magnetic field fall by about 30% with 0.1% bending strain and by a factor of 6 with 0.2% bending strain. At 20 T, critical currents fall with strain by approximately the same factor as at 4.2 K, but the critical currents fall with field somewhat faster. These bending strain results have a character quite different from Nb3Sn bronze process material in that there is essentially no prestress from the Cu jacket and there seems to be only a very small reversible range where the sample is within the elastic limit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349824
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  • 9
    Electronic Resource
    Electronic Resource
    Superconducting transport properties of 2.2-GeV Au-ion irradiated c-axis twist Bi2Sr2CaCu2O8+δ bicrystals (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 1323-1325 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 2.2-GeV Au-ions irradiation is used to study the effect of columnar defects on the transport properties of Bi2Sr2CaCu2O8+δ (Bi2212) bicrystals with high quality c-axis twist grain boundary. The studies show a similar increase in the irreversible temperature determined within the single crystals and across the grain boundaries after irradiation. However, the irradiation enhancement on the grain boundary critical current (Ic) at low temperatures is small, compared to the more than an order of magnitude increase of single crystal Ic. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123538
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  • 10
    Electronic Resource
    Electronic Resource
    Vortex phase diagram and Jc limiting factor in high Tc Bi2Sr2Ca2Cu3O10/Ag superconducting tapes (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 637-639 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Based on our detailed measurements of current–voltage characteristics for a Bi2Sr2Ca2Cu3O10/Ag tape (Jc(approximately-equal-to)2×104 A/cm2 at 77 K and zero field) immersed in liquid neon (27 K) and in liquid oxygen (54–90 K) as a function of applied magnetic field up to 17 T, we extended the vortex phase diagram of superconducting Bi2Sr2Ca2Cu3O10 in the mixed state and show that Jc for this tape at T≥27 K in magnetic field (except at very low field) is fundamentally limited by the transition of the vortex-solid-to-liquid within grains rather than the dissipation from grain boundaries. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114144
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