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  • 1
    Electronic Resource
    Electronic Resource
    Effect of plasticizer on thermodynamic properties of nylons: Model, phenomenology, and proposed experiments (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 3627-3630 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Motivated by experiments showing decreasing tensile modulus of nylons with increasing plasticizer content, a model involving the disruption of nylon hydrogen bonding by addition of plasticizer is proposed. This leads to proposed further experiments and suggests a complementary phenomenological analysis that involves the bulk modulus. The surface energy as a function of plasticizer concentration is then incorporated into the phenomenology. The importance of varying the temperature in the proposed thermodynamic measurements is stressed. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1345846
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  • 2
    Electronic Resource
    Electronic Resource
    Guiding center particle simulation of wide-orbit neoclassical transport (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 5192-5198 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The neoclassical ion transport in a tokamak plasma with circular cross section is studied with guiding center particle simulations. A Monte Carlo model of pitch-angle scattering which includes momentum conservation is employed. The model includes the whole plasma inside closed flux surfaces, but the focus is on the near-axis transport due to particles with wide orbits which lead to a different heat flux than in the standard theory. Neither of two recent theories of banana regime transport near the axis is confirmed by the simulations, nor do the numerical results for the plateau regime agree with a recent theory of wide-orbit transport in this regime. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1416486
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  • 3
    Electronic Resource
    Electronic Resource
    Comments on "Analysis of electron cyclotron current drive using neoclassical Fokker–Planck code without bounce-average approximation'' [Phys. Plasmas 2, 4570 (1995)] (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 2827-2828 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The conclusion reached in ref. 1 that the 3-D Fokker-Planck code verses the 2-D bounce-averaged code does not yield the correct current density is prove to be wrong. It is aruged that the results for the 3-D code are very close to those of the 2-D code that employs a bounce-average procedure.(AIP) © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871719
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  • 4
    Electronic Resource
    Electronic Resource
    Impact of radial transport on the quasilinear plateau formation due to electron cyclotron wave absorption (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 1628-1633 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Numerical simulations using a three-dimensional Fokker–Planck code show that for small tokamaks the transport of electrons across the magnetic surfaces at a level consistent with anomalous transport has a large influence on the formation of the quasilinear plateau during electron cyclotron resonant heating. The reduction of wave absorption due to the plateau formation is much smaller when the effects of radial transport are included. This is explained by the localized nature of the resonance in velocity space and the strong dependence of resonant energy on radial position. Impact of the effect on diagnostic signals is discussed. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872022
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  • 5
    Electronic Resource
    Electronic Resource
    Response of internal transport barriers to central electron heating and current drive on ASDEX Upgrade : The 41st annual meeting of the division of plasma physics of the american physical society (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 1839-1844 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Internal transport barriers with the central electron temperature as large as the central ion temperature both in excess of 10 keV have been achieved in the Axi-symmetric divertor experiment (ASDEX Upgrade) [H. Vernickel et al., J. Nucl. Mater. 128, 71 (1984)]. By applying central electron cyclotron heating and current drive to negative central shear discharges, established by neutral beam heating in the current ramp, the core electron temperatures could be raised by more than a factor of 2. Despite the fivefold increase of the central electron heat flux, the ion and electron energy and also angular momentum transport did not deteriorate. For neutral beam injection alone and also with additional central electron cyclotron counter-current drive, a double tearing mode and the associated detrimental effect on the plasma confinement is destabilized only transiently, when the minimum of the safety factor (qmin) passes through 2. For co-current drive, however, the confinement does not recover after qmin has dropped below 2, as the (2,1) mode persists due to the influence of the current profile modification in the very plasma center. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.874006
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  • 6
    Electronic Resource
    Electronic Resource
    Equations for the evolution of the radial electric field and poloidal rotation in toroidally symmetric geometry (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 763-767 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A set of three coupled ordinary differential equations that give the evolution of the density, the radial electric field, and poloidal plasma rotation are derived from the continuity equation and momentum balance. They include the effect of those processes considered to be of importance for the L- (low) to H- (high) mode transition: neutral friction, neoclassical viscosity, the radial pressure gradient, orbit losses, a radial current through a probe, anomalous stresses, and Stringer spin up. The equations are valid for arbitrary toroidally symmetric geometry and include effects of non-uniformity (of for instance the neutral friction) in the magnetic surface. As an example, non-uniform neutral friction in an elongated geometry is discussed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872762
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  • 7
    Electronic Resource
    Electronic Resource
    Extension of the ray equations of geometric optics to include diffraction effects (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 4386-4395 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The paper discusses an extension of the ray equations of geometric optics to include diffraction effects for a wave beam propagating in a dispersive anisotropic medium. The diffraction effects are introduced through a complex eikonal function, where the complex part describes the electric field profile of the beam. The ray equations are derived using a formalism that allows for a complex wave vector but yields trajectories of wave propagation in real space. The wavelength, width of the beam, and length scale over which the plasma parameters change are ordered 1: δ −1:δ −2, with δ being a small parameter. A consistent treatment of this ordering yields additional terms in the ray equations when compared with expressions in the literature, that arise from corrections to the dispersion relation. It is discussed to what accuracy the rays represent the flux of wave energy. An approximated set of equations that describe the propagation of a Gaussian beam is derived. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872056
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  • 8
    Electronic Resource
    Electronic Resource
    Boundary conditions for a Gaussian wave beam (2001)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 8 (2001), S. 4325-4330 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The beam tracing technique allows the description of short-wavelength wave beams by means of a set of ordinary differential equations, in which the effects of diffraction (neglected by the standard geometrical-optics procedure) are taken into account. The propagation of the beam is expressed in terms of a central ray and a set of parameters connected with the curvature of the wave front and the amplitude profile. Two crucial issues for the applicability of this technique to situations of experimental interest are the beam reflection from a mirror and the possibility of following the beam in its vacuum–plasma crossing. These problems are investigated in the paper. The parameters of the incident beam are regarded as known quantities and their values after reflection or inside the plasma are obtained. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1401116
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  • 9
    Electronic Resource
    Electronic Resource
    Reduced charge state equations that describe Pfirsch Schlüter impurity transport in tokamak plasma (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 268-275 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The paper discusses the impurity transport in a tokamak in the Pfirsch Schlüter regime. A reduced charge state method is developed for the set of coupled equations that describe the poloidal variation of the heat flux and the third Laguerre polynomial expansion of the distribution function. A comparison is made with analytic equations in the disparate mass limit, and the influence of the cross terms of the coupled equations, which have been neglected in earlier work, on the transport coefficients of a hydrogen helium plasma is discussed. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873812
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  • 10
    Electronic Resource
    Electronic Resource
    Stringer spin up due to anomalous transport (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 5 (1998), S. 2399-2404 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A simple equation for Stringer spin up due to anomalous transport valid in arbitrary toroidal symmetric geometry is derived. Additional terms are found compared with previous work that can be traced to a different ordering of the parallel velocity. The influence of elongation and Shafranov shift is shown to be small. Neoclassical viscosity is included and the case of both small and large viscosity are discussed.© 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.872915
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