Exponentially tapered Josephson flux-flow oscillator

Benabdallah, Assia; Caputo, Jean-Guy; Scott, Alwyn C.

doi:10.1103/physrevb.54.16139

Cited by 45 publications

(45 citation statements)

References 8 publications

(4 reference statements)

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“…The temporal behavior of the voltage is irregular leading to a large spectral width. 7 For Iϭ2.9 the speed has jumped to about 1.8 and the ratio is very small indicating that the solution follows the laminar flow benchmark. We estimated A to be about 10 and this clearly points out to a type 3 supraluminous helical wave.…”

Section: Large External Loadmentioning

confidence: 97%

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Laminar phase flow for an exponentially tapered Josephson oscillator

Benabdallah

Caputo

Scott

2000

Journal of Applied Physics

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Exponential tapering and inhomogeneous current feed were recently proposed as means to improve the performance of a Josephson flux flow oscillator. Extensive numerical results backed up by analysis are presented here that support this claim and demonstrate that exponential tapering reduces the small current instability region and leads to a laminar flow regime where the voltage wave form is periodic giving the oscillator minimal spectral width. Tapering also leads to an increased output power. Since exponential tapering is not expected to increase the difficulty of fabricating a flux flow oscillator, we suggest that this feature should be incorporated in future designs.

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Section: Large External Loadmentioning

confidence: 97%

“…To mitigate these effects, it was suggested in Ref. 7 to use an inhomogenous current feed and employ a new design in which the junction width is exponentially tapered, 8 making the flow of magnetic flux more regular and improving impedance matching to an external load.…”

Section: Introductionmentioning

confidence: 99%

Laminar phase flow for an exponentially tapered Josephson oscillator

Benabdallah

Caputo

Scott

2000

Journal of Applied Physics

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“…The fluxon dynamics in exponentially tapered Josephson flux-flow oscillator was studied in Ref. 11. Nonlinear localized modes in twodimensional photonic crystal waveguides were investigated in Ref.…”

Section: Introductionmentioning

confidence: 99%

Kink propagation and trapping in a two-dimensional curved Josephson junction

et al. 2004

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Sine-Gordon kink propagation in a curved planar waveguide is considered. The waveguide consists of two rectangular regions joined by a bent section of constant curvature. Transverse homogeneous and inhomogeneous Neumann boundary conditions are used. The latter models an energy-providing mechanism for Josephson junctions of overlap type. A collective variable approach based on the kink position and the kink width depending on the transversal coordinate is developed. The latter allows to take into account both longitudinal and centrifugal forces which act on the nonlinear excitation moving in a region with finite curvature and to obtain a qualitatively good agreement with the numerical simulations. The region with finite curvature acts as a potential barrier whose height and width depend on the radius of curvature of the waveguide. The kink transmission, reflection, and trapping are investigated. The kink may be captured when a driving force, provided by a magnetic field, is applied to the kink.

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“…In flux-flow oscillators the nonuniformity is advantageously employed in order to reduce the selffield effect and to facilitate unidirectional fluxon motion. [4][5][6] On the other hand, the problem of fluxon dynamics in nonuniform JJ's appears in the study of various fundamental physical phenomena. One of them is the problem of the transport entropy S , and thermomagnetic effects observed not only for ordinary superconductors but also for highly anisotropic high-T c superconductors ͑HTSC's͒; 7 these exhibit an intrinsic Josephson effect between individual superconducting layers 8 and thus are proven to have a quasi-twodimensional ͑2D͒ layered structure with Josephson coupling between layers.…”

Section: Introductionmentioning

confidence: 99%

Fluxon dynamics in long Josephson junctions in the presence of a temperature gradient or spatial nonuniformity

1997

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Fluxon dynamics in nonuniform Josephson junctions was studied both experimentally and theoretically. Two types of nonuniform junctions were considered: the first type had a nonuniform spatial distribution of critical and bias currents and the second had a temperature gradient applied along the junction. An analytical expression for the I-V curve in the presence of a temperature gradient or spatial nonuniformity was derived. It was shown that there is no static thermomagnetic Nernst effect due to Josephson fluxon motion despite the existence of a force pushing fluxons in the direction of smaller self-energy ͑from the cold to the hot end of the junction͒. A phenomenon, the ''zero crossing flux flow step'' ͑ZCFFS͒ with a nonzero voltage at a zero applied current, was observed in nonuniform long Josephson junctions. The phenomenon is due to the existence of a preferential direction for the Josephson vortex motion. ZCFFS's were observed at certain magnetic fields when the critical current in one direction but not the other becomes zero. Possible applications of nonuniform Josephson junctions in flux flow oscillators and as a superconducting diode are discussed.

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Exponentially tapered Josephson flux-flow oscillator

Cited by 45 publications

References 8 publications

Laminar phase flow for an exponentially tapered Josephson oscillator

Laminar phase flow for an exponentially tapered Josephson oscillator

Kink propagation and trapping in a two-dimensional curved Josephson junction

Fluxon dynamics in long Josephson junctions in the presence of a temperature gradient or spatial nonuniformity

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