2010/12/10 by E. A. Frolova, E.A. Frolova, Frolova, E. A. +7
Physics and Astronomy · #Atomic and Subatomic Physics Research #Data Analysis #Disordered Systems and Neural Networks (cond-mat.dis-nn) #FOS: Physical sciences #Mechanical and Optical Resonators #Physics of Superconductivity and Magnetism #Statistics and Probability (physics.data-an) #Superconductivity (cond-mat.supr-con) #cond-mat.dis-nn #cond-mat.supr-con #physics.data-an
paper · pdf · doi:10.48550/arxiv.1012.2304
4 pages, 7 figures
arxiv created 2010/12/10 · openalex publication_date 2010/12/10 · arxiv updated 2010/12/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The current-voltage and spectral characteristics of a flux flow oscillator (FFO), based on a long Josephson junction, are studied. The investigations are performed in the range of small bias currents and magnetic fields, where the FFO radiates a quasi-chaotic signal with extremely large radiation linewidth, and the displaced linear slope (DLS) is observed at the current-voltage characteristic. By direct numerical simulation of the sine-Gordon equation it is demonstrated that for large lengths of the Josephson junction or in the case of finite matching of the FFO with external waveguide system, the DLS with extremely large linewidth is transformed into Fiske steps with very narrow linewidth. While there is the common belief that the chaotic regime of the FFO is due to excitation of the internal oscillation modes in the "soft" fluxon chain, it is demonstrated that this regime is inspired by multiple reflections of the traveling waves from junction ends.