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  • 1
    Electronic Resource
    Electronic Resource
    EX6AFS: A data acquisition system for high-speed dispersive EXAFS measurements implemented using object-oriented programming techniques : Proceedings of the 5th international conference on synchrotron radiation instrumentation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 1391-1393 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In this paper we describe the design and implementation of a computerized data-acquisition system for high-speed energy-dispersive EXAFS experiments on the X6A beamline at the National Synchrotron Light Source. The acquisition system drives the stepper motors used to move the components of the experimental setup and controls the readout of the EXAFS spectra. The system runs on a Macintosh IIfx computer and is written entirely in the object-oriented language C++. Large segments of the system are implemented by means of commercial class libraries, specifically the MacApp application framework from Apple, the Rogue Wave class library, and the Hierarchical Data Format datafile format library from the National Center for Supercomputing Applications. This reduces the amount of code that must be written and enhances reliability. The system makes use of several advanced features of C++: Multiple inheritance allows the code to be decomposed into independent software components and the use of exception handling allows the system to be much more reliable in the event of unexpected errors. Object-oriented techniques allow the program to be extended easily as new requirements develop. All sections of the program related to a particular concept are located in a small set of source files. The program will also be used as a prototype for future software development plans for the Basic Energy Science Synchrotron Radiation Center Collaborative Access Team beamlines being designed and built at the Advanced Photon Source. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146515
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Gallium distribution in the clathrates Sr8Ga16Ge30 and Sr4Eu4Ga16Ge30 by resonant diffraction (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 2931-2933 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The distribution of gallium/germanium in the type-I clathrates Sr8Ga16Ge30 and Sr4Eu4Ga16Ge30 over the three crystallographically distinct framework sites has been determined by resonant diffraction. The analyses indicate a strong preference for the occupation of the 6c site by gallium. This is consistent with theoretical predictions, but contrary to the results of a previous neutron diffraction study. The gallium distribution, and, hence, the thermoelectric properties of these materials, may be amenable to manipulation by heat treatment. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1473236
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  • 3
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    Radiation pressure acceleration of protons to 93 MeV with circularly polarized petawatt laser pulses (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-07-08
    Description: The radiation pressure acceleration (RPA) of charged particles has been a challenging task in laser-driven proton/ion acceleration due to its stringent requirements in laser and target conditions. The realization of radiation-pressure-driven proton acceleration requires irradiating ultrathin targets with an ultrahigh contrast and ultraintense laser pulses. We report the generation of 93-MeV proton beams achieved by applying 800-nm 30-fs circularly polarized laser pulses with an intensity of 6.1 × 10 20   W / cm 2 to 15-nm-thick polymer targets. The radiation pressure acceleration was confirmed from the obtained optimal target thickness, quadratic energy scaling, polarization dependence, and three-dimensional particle-in-cell simulations. We expect this clear demonstration of RPA to facilitate the realization of laser-driven proton/ion sources delivering energetic and short-pulse particle beams for novel applications.
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 4
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    Angular variation of oblique Hanle effect in CoFe/SiO2/Si and CoFe/Ta/SiO2/Si tunnel contacts (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-03-22
    Description: Oblique Hanle effect (OHE) with magnetic field applied at an oblique angle θ (0 ≤ θ ≤ 180°) was systematically investigated using the 3-terminal (3T) geometry with CoFe/SiO 2 /Si tunnel contacts. Clear Hanle-like signals with asymmetric voltage dependence are obtained for all angles. It is found that the asymptotic value of the OHE uniquely depends on the angle θ and its angular variation can be fitted well with both functions of cos 2 θ and 1 1 − α γ 2   cos 2 θ as predicted from spin injection and impurity-assisted magnetoresistance models, respectively. In addition, no Hanle signal is observed in tunnel junctions with spin-unpolarized CoFe/Ta/SiO 2 /Si structure, which is also understandable by both models. The experimental data in this study demonstrate clearly that further study should be still done to uncover the underlying physics of the Hanle-like signal in 3T tunnel contacts.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 5
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    Ion temperature anisotropy due to perpendicular heating by Alfvén wave propagating along magnetic field lines (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-10-01
    Description: The perpendicular heating and acceleration of ions by linearly polarized Alfvén wave, which is propagating along constant background magnetic field, is studied. The perpendicular diffusion coefficient of ions is calculated through the autocorrelation function based on linear perturbation theory, which unambiguously demonstrates that ion heating is attained by non-resonant wave-particle interaction. It is found that the perpendicular heating and acceleration of ions occur by the Alfvén wave during a relatively short time interval, i.e., approximately 20 ion gyro period ( Ω i 0 t ) even though the perturbation amplitude is quite low. Also, it is shown that the temperature anisotropy of ions A , where A = T ⊥ / T ∥ − 1 , increases with the increasing perturbation amplitude while the parallel ion heating does not occur. Test particle simulation is also carried out in order to investigate the non-resonant perpendicular heating process.
    Print ISSN: 1070-664X
    Electronic ISSN: 1089-7674
    Topics: Physics
    Published by American Institute of Physics (AIP)
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