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  • 1
    Electronic Resource
    Electronic Resource
    Alternating current magnetic susceptibility measurements in La1−xSrxCoO3 (x≤0.30) below 300 K : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5753-5755 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A dynamical magnetic susceptibility study on La1−xSrxCoO3 samples obtained by a coprecipitation method is reported for x≤0.30. For x〈0.20 differences between zero field cooled and field cooled dc magnetic susceptibility appear at a temperature Ta below the Curie point, TC(approximate)240 K, as well as a magnetic freezing point at a temperature Tb〈Ta. Alternating current magnetic susceptibility shows two maxima at these temperatures, which is interpreted as the evidence of different interaction processes between ferromagnetic clusters mediated by a matrix of changing spin-state Co3+ ions. For x≥0.20 an unique blocking process seems to take place due to the percolation of the ferromagnetic clusters, making unimportant the contribution of the matrix. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364715
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  • 2
    Electronic Resource
    Electronic Resource
    Structural and magnetic characterization of Co particles coated with Ag : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6564-6566 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Co fine particles coated with Ag have been synthesized through the microemulsion method in an inert atmosphere. The size of the particles is controlled by the water droplets of the microemulsions. Fine particles prepared by this method, consist of a magnetic core of Co covered by a layer of Ag. Samples containing from 3.3 to 40.5 vol % Co have been prepared. The average size of the particles obtained is in the nanometer range. The magnetic properties were studied by dc magnetization at 77 K and room temperature. The data show a strong dependence of the magnetic properties on the annealing temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358195
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  • 3
    Electronic Resource
    Electronic Resource
    Excimer laser processing for surface improvement of tin oxide thin films (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 645-648 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Results are presented on the processing of tin oxide films using an excimer laser. Commercially available films of SnO2 deposited on glass substrates were treated using a KrF excimer laser (248 nm). The results of these treatments were characterized by normal optical absorption, transmittance, and reflectance measurements in the VIS-NIR region along with x-ray diffraction and electrical conductivity measurements and a scanning electron microscopy (SEM) study. These were compared to the nontreated samples. The results inferred a relation between the amount of photoablated material with laser fluence, up to saturation. The optical spectroscopy results and the SEM study evidence modifications of the treated surface. On the other hand, the x-ray analysis indicates that the crystal structure is not altered by the laser treatment but the film morphology is. Furthermore, an increase of 15% and better in the normalized integrated optical transmittance in the visible region was obtained with this treatment, without changing the film electrical conductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355226
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  • 4
    Electronic Resource
    Electronic Resource
    Physics of compact stellarators : The 40th annual meeting of the division of plasma physics of the american physical society (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 1858-1864 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recent progress in the theoretical understanding and design of compact stellarators is described. Hybrid devices, which depart from canonical stellarators by deriving benefits from the bootstrap current which flows at finite beta, comprise a class of low aspect ratio A〈4 stellarators. They possess external kink stability (at moderate beta) in the absence of a conducting wall, possible immunity to disruptions through external control of the transform and magnetic shear, and they achieve volume-averaged ballooning beta limits (4%–6%) similar to those in tokamaks. In addition, bootstrap currents can reduce the effects of magnetic islands (self-healing effect) and lead to simpler stellarator coils by reducing the required external transform. Powerful physics and coil optimization codes have been developed and integrated to design experiments aimed at exploring compact stellarators. The physics basis for designing the national compact stellarator will be discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873489
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  • 5
    Electronic Resource
    Electronic Resource
    Predictions on runaway current and energy during disruptions in tokamak plasmas (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 3369-3377 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A simple model for a tokamak disruption, taking into account the replacement of the plasma current by the runaway current, is used to evaluate the generation and energy of the runaway population during the current quench phase of a fast disruptive event. The potential efficiency of the ripple resonance and the magnetic fluctuations for runaway current mitigation during plasma disruptions, as well as their dependence on the runaway generation mechanism, are discussed. Predictions are made for the Joint European Torus (JET) [Nucl. Fusion 25, 1011 (1985)] and the projected International Thermonuclear Experimental Reactor (ITER) [ITER EDA Agreement and Protocol 2, International Atomic Energy Agency, Vienna, 1994]. It is shown that the ripple resonance leads to a reduction in the runaway beam energy if the runaway production is dominated by the Dreicer generation process; however, the effect will be negligible if the secondary generation mechanism is included. The effect of anomalous radial runaway losses induced by enhanced magnetic fluctuations is stronger. Large enough levels of magnetic fluctuations, leading to runaway electron loss rates in excess of 103 s−1, can efficiently limit the number and energy of the runaway electrons. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.874201
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  • 6
    Electronic Resource
    Electronic Resource
    Momentum–space structure of relativistic runaway electrons (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 2370-2377 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dynamics of relativistic runaway electrons in tokamak plasmas is analyzed using a test particle description that includes acceleration in the toroidal electric field, collisions with the plasma particles, and deceleration due to synchrotron radiation losses. The region of momentum space in which electron runaway takes place is determined. It is found that relativistic and synchrotron radiation effects lead to a critical electric field ER〉(kTe/mec2)ED, below which no runaways are generated. In addition, the trajectories of the test electrons in momentum space show a stable equilibrium point that sets a limit on the energy that the runaway electrons can reach. Analytical expressions are given for this energy limit as a function of the toroidal electric field and plasma parameters. The dominant radiative mechanisms limiting the runaway electron energy are identified in the whole range of electric field values. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872911
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  • 7
    Electronic Resource
    Electronic Resource
    Interaction of runaway electrons with lower hybrid waves via anomalous Doppler broadening (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 1667-1675 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Due to the relativistic decrease of the electron cyclotron frequency, a cyclotron resonance may appear between runaway electrons and lower hybrid waves. A single particle description of the runaway dynamics [J. R. Martín-Solís et al., Phys. Plasmas 5, 2370 (1998)] is extended to analyze the effect of the interaction of runaway electrons with lower hybrid waves via anomalous Doppler broadening. The conditions under which the resonant interaction can play a role in limiting the runaway energy are established and it is shown that, under typical lower hybrid current drive operation parameters, an efficient wave-particle coupling may occur. Observations of a fast pitch angle scattering event during the current decay phase of Ohmic discharges in the Toroidal Experiment for Technically Oriented Research (TEXTOR) [R. J. E. Jaspers, Ph.D. thesis, Technical University Eindhoven (1995)] are interpreted in terms of such interaction. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1470165
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  • 8
    Electronic Resource
    Electronic Resource
    On the effect of synchrotron radiation and magnetic fluctuations on the avalanche runaway growth rate (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 3814-3817 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The avalanche runaway growth rate was recently determined by analysis of the trajectories of the secondary runaway electrons in momentum space [Parks et al., Phys. Plasmas 6, 2523 (1999)]. Here, such an approach is used to study the effect of the electron synchrotron radiation and the magnetic fluctuations on the secondary generation of runaway electrons. It is found that not only the threshold electric field for runaway generation is increased due to these effects, but also the creation rate of secondary runaway electrons may be noticeably reduced for electric fields close to the threshold field. It has been shown that avalanche runaway generation can be efficiently suppressed in large tokamaks, even during major disruptions, for stochastic magnetic fluctuation levels b˜〉10−3. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1287215
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  • 9
    Electronic Resource
    Electronic Resource
    Giant magnetoresistance in fine particle of La0.67Ca0.33MnO3 synthesized at low temperatures (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 134-136 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using a sol-gel method we have prepared monodispersive particles of La0.67Ca0.33MnO3 in the range from 20 to 110 nm at temperatures from 540 to 1000 °C. A magnetoresistance above 10% was obtained in a field of 1 kOe for all the particles sizes. These results may be relevant for future applications. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116780
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  • 10
    Electronic Resource
    Electronic Resource
    Carbon doping in GaAs layers grown with trimethylgallium and solid arsenic in a mixture of hydrogen and nitrogen (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 2359-2361 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Carbon doped GaAs epitaxial layers have been grown using solid arsenic and trimethylgallium. Carbon incorporation, proceeding from the organic radicals, was found to be dependent on the hydrogen partial pressure. The latter was fixed by the introduction of nitrogen in the carrier gas. Controlled p-doping between 1016 and 1221 cm−3 has been obtained by adjusting the composition of the carrier gas. The growth rate of the layers was found to be reduced by the introduction of nitrogen. Mirrorlike surfaces were obtained if at least 2% hydrogen was mixed in the carrier gas, but only polycrystalline films could be grown in a pure nitrogen atmosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109389
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