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  • 1
    Electronic Resource
    Electronic Resource
    Measurements of biomagnetic fields using a high-resolution dc superconducting quantum interference device magnetometer : The 7th joint MMM-intermag conference on magnetism and magnetic materials (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 6465-6467 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have developed a multichannel high-resolution superconducting quantum interference device magnetometer for measuring biomagnetic fields produced by small animals. We measured the magnetocardiogram produced by a rat. Topographies of the P wave, QRS wave, and T wave of the rat magnetocardiogram were obtained. We also measured the magnetoretinogram, visually evoked magnetic fields, and auditory evoked magnetic fields of the rat. The signals of the magnetoretinogram appeared at 60 ms latency and the field intensities were about 0.6 pT. It was not possible to obtain the clear visually evoked fields because those signals were hidden behind the magnetoretinogram. It was possible to obtain auditory evoked magnetic fields of the rat. The significant differences of the wave forms were observed in both sides of the right ear, which are separated by 15 mm. Our system has adequate spatial resolution for measurement of the magnetocardiogram and auditory evoked magnetic fields produced by small animals. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367739
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  • 2
    Electronic Resource
    Electronic Resource
    Toroidal electron temperature gradient driven drift modes (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 2971-2983 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electron temperature gradient in tokamak geometry is shown to drive a short wavelength lower hybrid drift wave turbulence resulting from the unfavorable magnetic curvature on the outside of the torus. Ballooning mode theory is used to determine the stability regimes and the complex eigenfrequencies. At wavelengths of the order of the electron gyroradius, the polarization is electrostatic and the growth rate is greater than the electron transit time around the torus. At longer wavelengths of the order of the collisionless skin depth, the polarization is electromagnetic with electromagnetic vortices producing the dominant transport. The small scale electrostatic component of the turbulence produces a small, of order (me/mi)1/2, drift wave anomalous transport of both the trapped and passing electrons while the c/ωpe scale turbulence produces a neo-Alcator [Nucl. Fusion 25, 1127 (1985)] type transport from the stochastic diffusion of the trapped electrons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866954
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of shear on toroidal ion temperature gradient mode turbulence (1990)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 978-984 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of magnetic shear on the toroidal ion temperature gradient-driven drift mode is investigated through two-dimensional fluid simulations. Shear reduces the anomalous thermal transport by localizing the turbulence. Mixing length formulas for anomalous ion thermal transport are derived in various regimes with respect to the strength of the magnetic shear.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859244
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  • 4
    Electronic Resource
    Electronic Resource
    Kinetic theory of the electromagnetic drift modes driven by pressure gradients (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 3050-3060 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Kinetic equations for the electromagnetic drift modes are derived and analyzed for the stability of tokamaks in the local approximation. In the dissipationless, hydrodynamic limit, the fifth-order polynomial dispersion relation previously studied is recovered. The kinetic velocity space integrals in the ion dynamics are shown to modify the five principal modes of oscillation and their polarizations. It is shown that in kinetic stability theory the critical plasma pressure defined in magnetohydrodynamic theory determines a transition from microinstability to macroinstability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865146
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  • 5
    Electronic Resource
    Electronic Resource
    Transition from resistive-G to ηi- driven turbulence in stellarator systems (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 1638-1643 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: By an electromagnetic incompressible two-fluid model describing both ion temperature gradient drift modes (ηi modes) and resistive interchange modes (g modes), a new type of ηi mode is studied in cylindrical geometry including magnetic shear and an averaged curvature of Heliotron/Torsatron. This ηi mode is destabilized by the coupling to the unstable g mode. Finite plasma pressure beta increases the growth rate of this mode and the radial mode width also increases with plasma pressure beta indicating large anomalous transport in the Heliotron/Torsatron configuration. The transport from ηi mode exceeds that from resistive g when the mean-free-path exceeds the machine circumference. For plasma beta above two to three times the Suydam limit, the m=1/n=1 growth rate increases from the ηi mode value to the magnetohydrodynamic (MHD) value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859683
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  • 6
    Electronic Resource
    Electronic Resource
    Anomalous electron thermal conduction from magnetic turbulence (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 2527-2530 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electron thermal balance equation from the Braginskii equations with the finite Larmor radius heat flux is analyzed for the space-time-average power balance in the presence of electromagnetic fluctuations. Formulas for the anomalous thermal flux associated with the E×B motion and the magnetic δB⊥ fluctuations are derived and evaluated for the c/ωpe scale electromagnetic turbulence typical of the ∇Te-driven short wavelength drift modes. The result is compared with several Ohkawa-type formulas for the anomalous electron thermal energy transport.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859188
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  • 7
    Electronic Resource
    Electronic Resource
    Coherent structures in ηi-mode turbulence (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 615-619 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Numerical simulations of the ion-temperature-gradient-driven mode (ηi- mode) show that long-lived, large-scale coherent structures exist and play an important role in the study of the anomalous transport. In this work, the stationary solutions of the nonlinear equations describing the dynamics of the ηi -mode are investigated. The simplest solution is found to be a dipolar vortex in the shearless case. In the presence of the magnetic shear, a modified dipolar vortex solution is found through perturbation theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859860
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