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Feb 2013

Volume 20, Issue 2, Articles (02xxxx)

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Phys. Plasmas 20, 022303 (2013); http://dx.doi.org/10.1063/1.4790639 (12 pages)

Julio J. Martinell and Diego del-Castillo-Negrete
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Multi-layered dielectric cladding plasmonic microdisk resonator filter and coupler

Bo Han Cheng (成柏翰) and Yung-Chiang Lan (藍永強)

Phys. Plasmas 20, 020701 (2013); http://dx.doi.org/10.1063/1.4792157 (4 pages)

Online Publication Date: 8 February 2013

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This work develops the plasmonic microdisk filter/coupler, whose effectiveness is evaluated by finite-difference time-domain simulation and theoretical analyses. Multi-layer dielectric cladding is used to prevent the scattering of surface plasmons (SPs) from a silver microdisk. This method allows devices that efficiently perform filter/coupler functions to be developed. The resonant conditions and the effective refractive index of bounded SP modes on the microdisk are determined herein. The waveguide-to-microdisk distance barely influences the resonant wavelength but it is inversely related to the bandwidth. These findings are consistent with predictions made using the typical ring resonator model.
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85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
07.10.Cm Micromechanical devices and systems
84.30.Vn Filters
84.40.Dc Microwave circuits

Global current profile effects on the evolution and saturation of magnetic islands

A. Poyé, O. Agullo, A. Smolyakov, S. Benkadda, and X. Garbet

Phys. Plasmas 20, 020702 (2013); http://dx.doi.org/10.1063/1.4791653 (4 pages)

Online Publication Date: 14 February 2013

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The nonlinear evolution of magnetic islands is investigated by means of numerical simulations. The growth and saturation of the island are shown to depend not only on asymptotic tearing mode stability parameter Δ′ but also on the initial global current profile. Presence of the external current sheets leads to the formation of different island state for the same value of Δ′. It is found that the flow vorticity generated by the interacting current sheets is an important feature of nonlocal interactions and nonlocal effects in magnetic islands dynamics.
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52.30.Cv Magnetohydrodynamics (including electron magnetohydrodynamics)
52.35.Mw Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.)
52.35.Py Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.)
52.35.We Plasma vorticity
52.65.-y Plasma simulation
02.60.Cb Numerical simulation; solution of equations

Laser-heater assisted plasma channel formation in capillary discharge waveguides

N. A. Bobrova, P. V. Sasorov, C. Benedetti, S. S. Bulanov, C. G. R. Geddes, C. B. Schroeder, E. Esarey, and W. P. Leemans

Phys. Plasmas 20, 020703 (2013); http://dx.doi.org/10.1063/1.4793447 (4 pages)

Online Publication Date: 21 February 2013

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A method of creating plasma channels with controllable depth and transverse profile for the guiding of short, high power laser pulses for efficient electron acceleration is proposed. The plasma channel produced by the hydrogen-filled capillary discharge waveguide is modified by a ns-scale laser pulse, which heats the electrons near the capillary axis. This interaction creates a deeper plasma channel within the capillary discharge that evolves on a ns-time scale, allowing laser beams with smaller spot sizes than would otherwise be possible in the unmodified capillary discharge.
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52.50.Jm Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.)
52.65.Kj Magnetohydrodynamic and fluid equation
52.30.Cv Magnetohydrodynamics (including electron magnetohydrodynamics)
52.38.Dx Laser light absorption in plasmas (collisional, parametric, etc.)
52.38.Hb Self-focussing, channeling, and filamentation in plasmas
52.38.Kd Laser-plasma acceleration of electrons and ions

Boundary induced amplification and nonlinear instability of interchange modes

Jupiter Bagaipo and A. B. Hassam

Phys. Plasmas 20, 020704 (2013); http://dx.doi.org/10.1063/1.4793725 (4 pages)

Online Publication Date: 21 February 2013

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It is shown that small distortions on the boundaries are amplified in the core of a magnetized plasma if the system is close to marginal stability for the ideal magnetohydrodynamic interchange mode. It is also shown that such marginal systems can be nonlinearly unstable. The combination of boundary amplification and nonlinearity is shown to result in a nonlinear instability. The induced instability is highly sensitive to the boundary in that, if the fractional deviation from marginality is a small parameter b, the system can go unstable from fractional boundary distortions of O(b3/2).
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52.30.Cv Magnetohydrodynamics (including electron magnetohydrodynamics)
52.35.Py Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.)
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