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  • 1
    Electronic Resource
    Electronic Resource
    Spontaneous and field induced spin reorientation transitions of DyFe11Ti single crystal : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5908-5910 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The spontaneous and field induced spin reorientation transitions (SRT) have been studied in the DyFe11Ti compound, using different experimental techniques as: ac magnetic susceptibility, magnetization, and electric resistivity. From these measurements, the thermal dependence of the easy magnetization direction has been undoubtedly determined from 4.2 to 300 K, range in which two SRT take place (at ∼69 and 187 K). We have checked the continuous character of the SRT at 187 K. On the other hand, it has been established that the SRT at 69 K under an applied magnetic field (H≥2 kOe) becomes of first order.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353518
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  • 2
    Electronic Resource
    Electronic Resource
    Fe K-edge x-ray magnetic circular dichroism study in R6Fe23 (R=Ho and Y) compounds near compensation temperature (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 336-338 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a x-ray magnetic circular dichroism (XMCD) study performed at the Fe K edge in R6Fe23 compounds exhibiting magnetic compensation (R=Ho and Y). The Fe K-edge XMCD signal has been identified as due to both Fe itself and rare-earth contributions. Following a simple two-sublattices model for the analysis of the dichroic signal the contribution of the rare-earth sublattice to total Fe K-edge XMCD signal has been extracted and proven to be directly correlated to the R magnetic moment. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373663
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  • 3
    Electronic Resource
    Electronic Resource
    A self-organized critical transport model based on critical-gradient fluctuation dynamics (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 841-848 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A one-dimensional transport model based on critical-gradient fluctuation dynamics is presented. This model has the characteristic properties of a self-organized critical (SOC) system. As the source increases and for an input flux above a threshold value, a dynamical transition spontaneously takes place. A high-gradient edge region forms. The width of this region increases with increasing value of the particle source. Transport dynamics in this edge region self-organizes to be very close to marginal stability, while the core remains at the subcritical gradient that is typical of a SOC system. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1455630
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of poloidally asymmetric sheared flow on resistive ballooning turbulence (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 3910-3917 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The shear flow induced through the Reynolds stress tensor by turbulence with ballooning character is poloidally asymmetric. For circular cross section tokamak plasmas, its main component is the (m=1, n=0). The effect of such a sheared flow on both linear and nonlinear instability is analyzed. Its effect on the linear stability properties of resistive ballooning modes is compared with the effect of poloidally symmetric sheared flows. It is shown that asymmetry in the flow does not reduce its effectiveness in stabilizing the linear resistive ballooning modes. It is also effective in reducing the turbulence level and decreasing the turbulence induced diffusivities. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873654
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  • 5
    Electronic Resource
    Electronic Resource
    Resistive pressure gradient-driven turbulence at stellarator plasma edge (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 3282-3292 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High resolution calculations of resistive pressure gradient-driven turbulence for the plasma edge parameters of the Advanced Toroidal Facility (ATF) [J. F. Lyon et al., Fusion Technol. 10, 179 (1986)] electron cyclotron heated discharges give fluctuation levels, consistent with the experimental measurements. This turbulence model is also used to simulate the transition from the low confinement to the high confinement mode. The transition is triggered through the poloidal flow amplification induced by the Reynolds stress. After the transition, the confinement improvement is relatively low (30%–40%), even for unrealistically low poloidal viscosity. In the high confinement mode, the characteristic radial scale length of the poloidal flow in the three-dimensional calculations (separation between the lowest-n resonant surfaces) is different from the single helicity results (radial correlation length of the fluctuations). The simple criterion based on the ratio of shearing rate to the linear growth rate does not quantitatively account for the fluctuation reduction. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872469
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  • 6
    Electronic Resource
    Electronic Resource
    Numerical simulation of a negative ion plasma expansion into vacuum (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 4240-4253 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The expansion into vacuum of a one-dimensional, collisionless, negative ion plasma is investigated in the framework of the Vlasov–Poisson model. The basic equations are written in a "new time space" by use of a rescaling transformation and, subsequently, solved numerically through a fully Eulerian code. As in the case of a two species plasma, the time-asymptotic regime is found to be self-similar with the temperature decreasing as t−2. The numerical results exhibit clearly the physically expected effects produced by the variation of parameters such as initial temperatures, mass ratios and charge of the negative ions. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872587
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  • 7
    Electronic Resource
    Electronic Resource
    Theory of electric-field curvature effects on long-wavelength drift wave turbulence (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 1142-1153 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A simple model of long-wavelength drift waves is used to study the way in which a radial electric-field profile influences the growth and saturation of turbulence. For a fixed external field, the effect of curvature (∂2Er/∂r2) dominates that of shear (∂Er/∂r). In the linear regime, both affect the average k(parallel) at which ion damping occurs: shear by shifting the eigenmode off the resonant surface and curvature by changing the eigenmode width. Curvature damps more efficiently and also shifts the real frequency of the drift wave, changing the instability drive. In the nonlinear regime, radial trapping at large fluctuation levels limits the ability of an external electric-field profile to affect the spatial structure. Changes in damping are now less effective than the feedback between frequency shift and drive. The importance of the frequency shift caused by electric-field curvature in the presence of finite-amplitude fluctuations has been demonstrated by numerical calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.870765
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  • 8
    Electronic Resource
    Electronic Resource
    Sheared flow amplification by vacuum magnetic islands in stellarator plasmas (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 4111-4119 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: There is some experimental evidence that the E×B flows have radial structure that may be linked to rational surfaces. This flow structure may result from a self-organization process involving nonlinear flow amplification through Reynolds stress and fluctuation reduction by sheared flows. In stellarators, a large contribution to the Reynolds stress comes from the coupling of the magnetic field component of a vacuum field island with a plasma instability. In this process, the self-organization principle seems to be marginal stability for the fluctuations driving the flow. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1392996
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  • 9
    Electronic Resource
    Electronic Resource
    Resistive pressure-gradient-driven instabilities in the transition regime to fully developed turbulence (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 47-54 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Numerical calculations of resistive pressure-gradient-driven turbulence in toroidal geometry for tokamak plasma edge parameters have been carried out in the unstable regime below the threshold for fully developed turbulence. This threshold is at a β value of about three times the linear stability threshold. In this regime, the toroidal mode number spectrum in the stationary state is dominated by a single toroidal mode. The dominant mode may intermittently fluctuate among a narrow range of possible values. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1430252
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  • 10
    Electronic Resource
    Electronic Resource
    Spatiotemporal structure of resistive pressure-gradient-driven turbulence (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 107-115 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-resolution turbulence calculations are needed to characterize the resistive pressuregradient-driven turbulence in toroidal geometry because the wave number spectrum is very broad with a low decay index. Here, two main issues are addressed: the spatiotemporal structure of the turbulence and the validity of the mixing-length approach for toroidal geometry. Well above the instability threshold, steady-state turbulence is established. In this case, the relevant spatial scales are the width of the individual poloidal components of the ballooning mode, instead of the toroidal scale lengths. The situation is reversed near the instability threshold, where the stationary state can be dominated by one toroidal mode. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873258
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