Flux-flow-type Josephson oscillator for millimeter and submillimeter wave region. II. Modeling

Nagatsuma, Tadao; Enpuku, Keiji; Yoshida, Keiji; Irie, F.

doi:10.1063/1.333849

Cited by 112 publications

(29 citation statements)

References 23 publications

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“…Now we consider the effect of displacement currents on dynamics of Josephson vortices by first solving the full Eq. (7) for moderate damping at α = 0.3 and H = 2H 1 . The results shown in Fig.…”

Section: DC Fieldmentioning

confidence: 99%

Nonlinear dynamics of Josephson vortices in a film screen under dc and ac magnetic fields

Sheikhzada

Gurevich

2014

Physica C: Superconductivity and its Applications

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We present detailed numerical simulations of Josephson vortices in a long Josephson junction perpendicular to a thin film screen under strong dc and ac magnetic fields. By solving the sineGordon equation, we calculated the threshold magnetic field for penetration of fluxons as a function of frequency, and the power dissipated by oscillating fluxons as functions of the ac field amplitude and frequency. We considered the effects of superimposed ac and dc fields, and a bi-harmonic magnetic field resulting in a vortex ratchet dynamics. The results were used to evaluate the contribution of weak-linked grain boundaries to the nonlinear surface resistance of polycrystalline superconductors under strong electromagnetic fields, particularly thin film screens and resonator cavities.

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Section: DC Fieldmentioning

confidence: 99%

Nonlinear dynamics of Josephson vortices in a film screen under dc and ac magnetic fields

Sheikhzada

Gurevich

2014

Physica C: Superconductivity and its Applications

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“…Several years ago the team of the Institute of Radio Engineering and Electronics RAS proposed the concept of a fully superconducting integrated receiver of submillimeter waves and tested it experimentally [1][2][3]. The common microchip of the receiver integrates the quantum mixer based on the quasi-particle nonlinearity of the 'superconductorinsulator-superconductor' transition (SIS transition), planar superconducting receiving antenna, cryogenic flux flow oscillator (FFO) [4,5], and the harmonic SIS mixer for stabilization of the frequency of this oscillator [6].…”

Section: Introductionmentioning

confidence: 99%

Integrated superconducting spectrometer for atmosphere monitoring

Koshelets

Дмитриев

Ermakov

et al. 2005

Radiophys Quantum Electron

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The results of the development of sub-mm Superconducting Integrated Receiver (SIR) for monitoring of the Earth's atmosphere from high-altitude balloons are presented. The microchip of the superconducting integrated receiver comprising local oscillator based on the long Josephson junction (flux flow oscillator, FFO) is developed and successfully tested. The receiver noise temperature as low as 200 K is measured at a frequency of 650 GHz. The possibility to phase-lock FFO to the reference oscillator, which is vitally important for spectrometer operation, is demonstrated. To ensure the possibility of remote tuning of a phase-locked (PL) SIR onboard a balloon, a number of approaches for the PL SIR automatic computer control are developed and tested. New modifications of the superconducting local oscillator (FFO) are developed, fabricated and tested. The FFO design is optimized for the integrated spectrometer. The FFO linewidth is studied at frequencies of up to 700 GHz using a specially developed technique. A free-running linewidth between 9 and 2 MHz is measured in the frequency range from 500 to 700 GHz. As a result, the spectral ratio of the phased-locked FFO ranges from 35 to 90%. The effect of FFO linewidth imperfections on the retrieval procedure of the atmosphere gas spectra is studied.

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“…The 550 -650 GHz channel is based on a phase-locked Superconducting Integrated Receiver (SIR) [2]. SIR is an on-chip combination of a low-noise SIS mixer with quasioptical antenna, a superconducting Flux Flow Oscillator (FFO) [3] acting as a Local Oscillator (LO) and an SIS harmonic mixer (HM) for FFO phase locking. The velocity and density of the fluxons and thus the power and frequency of the FFO may be adjusted independently by joint action of bias current and magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Superconducting Submm Integrated Receiver for TELIS

Koshelets

Ermakov

Filippenko

et al. 2006

J. Phys.: Conf. Ser.

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Flux-flow-type Josephson oscillator for millimeter and submillimeter wave region. II. Modeling

Abstract: Fluxflowtype Josephson oscillator for millimeter and submillimeter wave region. III. Oscillation stability J. Appl. Phys. 58, 441 (1985); 10.1063/1.335643 Fluxflow type Josephson oscillator for millimeter and submillimeter wave region

Cited by 112 publications

References 23 publications

Nonlinear dynamics of Josephson vortices in a film screen under dc and ac magnetic fields

Nonlinear dynamics of Josephson vortices in a film screen under dc and ac magnetic fields

Integrated superconducting spectrometer for atmosphere monitoring

Superconducting Submm Integrated Receiver for TELIS

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