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  • 1
    Electronic Resource
    Electronic Resource
    Theoretical and experimental investigation of leakage power in microwave transmit–receive switches (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 6631-6638 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theoretical and experimental investigation is made of the leakage power in microwave transmit–receive switches. The peak leakage power is shown to be independent of incident peak power but to depend on the rise time of the incident pulse. The plateau leakage power through the switch is also estimated and shown to be independent of incident peak power. The theoretical predictions for peak leakage power and plateau leakage power are compared and found to be in good agreement with experimental results. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363781
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  • 2
    Electronic Resource
    Electronic Resource
    Generalized criteria for microwave breakdown in air-filled waveguides (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 2935-2945 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Generalized threshold conditions for breakdown in air-filled high-power microwave waveguides are formulated. The analysis takes into account the temperature-dependent processes in air that affect the breakdown process. The results provide a theoretical explanation of the fact that breakdown thresholds of microwave devices are observed to be much lower than those predicted by the conventional cold-air theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342740
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  • 3
    Electronic Resource
    Electronic Resource
    Breakdown phenomena in microwave transmit-receive switches (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 1981-1992 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A detailed experimental and theoretical investigation is made of the physical phenomena involved in the generation of a breakdown plasma in a microwave transmit-receive switch and in the subsequent interaction between the plasma and incident microwave. Particular emphasis is given to characteristics like breakdown and sustainment levels, turn-on time, and reflected, transmitted, and absorbed powers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348771
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  • 4
    Electronic Resource
    Electronic Resource
    A model for steady-state breakdown plasmas in microwave transmit-receive tubes (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 93-98 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A model is proposed for the consistent description of the steady-state interaction between a high-power microwave and a breakdown plasma in transmit-receive (TR) tubes often used as switches in radar microwave systems. The electron-density equilibrium in the TR tube is established as a balance between the ionization produced by the wave and various electron-loss processes. In the currently proposed model, it is shown that diffusive losses of electrons in the direction of wave propagation is the most important loss process. An approximate analytical solution is derived from the model and compared with the numerically obtained full solution. Finally, the predictions obtained from the model concerning the scaling of absorbed and reflected microwave power are shown to be in good agreement with experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350222
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  • 5
    Electronic Resource
    Electronic Resource
    Analysis of a nonlinear diffusion equation describing the formation of transport barriers in fusion plasmas (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 3521-3526 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In tokamak fusion plasmas, transport barriers may form in the region between the core and the scrape-off layer due to E×B shear suppression. The properties of the corresponding density transport can be modeled in terms of a diffusion equation with a strongly nonlinear diffusion coefficient, which depends on the first as well as on the second-order density gradients. An investigation of the steady state, as well as dynamical properties of this nonlinear diffusion, has been carried out, aiming at a simplified analytical description. In particular, different forms of steady-state solutions and their stability are discussed, hysteresis effects are shown to be a characteristic feature of the model equation, and the dynamical evolution between different stationary states is also described in terms of explicit analytical expressions. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873612
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  • 6
    Electronic Resource
    Electronic Resource
    The radial and poloidal localization of fast magnetoacoustic eigenmodes in tokamaks (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 1479-1486 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Edge-localized fast magnetoacoustic eigenmodes (FME) may be responsible for the observed superthermal ion cyclotron emission in recent deuterium/deuterium (DD) and deuterium/tritium (DT) experiments. These modes can be driven unstable by resonant interaction with a small population of energetic ions (e.g., fusion alphas), having an anisotropic distribution in velocity space, provided that the mode frequency is close to the ion cyclotron frequency. In the present paper, the radial and poloidal structure of these eigenmodes is analyzed, by solving the two-dimensional (2D) eigenmode equation both numerically and analytically using a variational approach. In particular, the conditions for the mode localization and the dependence of the mode structure on aspect ratio and ellipticity are investigated. The eigenmode is found to be radially localized near the plasma edge. In a tokamak with finite aspect ratio, the mode is localized also poloidally near the outer midplane edge. The existence of localized solutions for both sign of the poloidal mode number is found to be sensitive to the ellipticity, the magnitude of parallel wave number and the plasma density profile. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873967
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  • 7
    Electronic Resource
    Electronic Resource
    Sawteeth-induced impurity transport in tokamak plasmas (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 956-964 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A consistent picture of sawteeth-induced impurity transport is presented based on a recently given model for plasma redistribution by sawtooth crashes. The redistribution model is based on ideal magnetohydrodynamic conservation laws and assumes that the magnetic flux and the volume of the layers that reconnect during the crash are conserved. The post-crash redistributed impurity density is found in terms of the impurity density before the crash and the profiles of the safety factor before and after the crash. Comparisons with experimental results show good qualitative agreement. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871800
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  • 8
    Electronic Resource
    Electronic Resource
    Breakdown-induced distortion of high-power microwave pulses in air (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 3528-3531 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A simple analytical modeling is made of the main breakdown properties of high-power microwave pulses propagating in air. Particular emphasis is given to breakdown levels, breakdown times, pulse erosion, and optimal pulse energy transfer. Comparison with recent experimental results shows good agreement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859731
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  • 9
    Electronic Resource
    Electronic Resource
    Self-consistent structure of an ionization wave produced by microwave breakdown in atmospheric air (1986)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 29 (1986), S. 446-449 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A self-consistent analysis is given for the development of an air discharge produced by microwaves with powers above the breakdown threshold. The structure of the ionization wave is derived for planar geometry and for arbitrary initial conditions. The theoretical predictions are in excellent agreement with previous results obtained by numerical simulations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865728
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  • 10
    Electronic Resource
    Electronic Resource
    The stochastic nature of ion-cyclotron-resonance wave–particle interaction in tokamaks (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 1927-1934 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The threshold in wave amplitude for the onset of stochastic motion of ion-cyclotron-resonance-heated minority ions in tokamaks is calculated. As a separate result, the solutions to the guiding center equations of motion are presented. Full account is taken to the effects of the finite orbit width of high-energy particles and the ellipticity of the flux surfaces. The orbits of trapped particles are shown to become stochastic more easily than those of circulating particles, and near the trapped/passing boundary an arbitrarily weak wave field is needed for stochastization. Finite orbit width effects have significant impact on the results, decreasing the stochastization amplitude for highly energetic particles considerably, as compared with earlier theories. Nevertheless, for realistic JET parameters [Plasma Phys. Controlled Fusion 30, 1467 (1988)], only a small fraction of the minority ions move stochastically in a monochromatic ion-cyclotron range of frequencies (ICRF) wave field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.860045
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