MIDIT OFD CATS Modelling, Nonlinear Dynamics Optics and Fluid Dynamics Chaos and Turbulence Studies and Irreversible Thermodynamics Risø National Laboratory Niels Bohr Institute and Technical University of Denmark Building 128 Department of Chemistry Building 321 P.O. Box 49 University of Copenhagen DK-2800 Lyngby DK-4000 Roskilde DK-2100 Copenhagen Ø Denmark Denmark Denmark
by Alexey V. Yulin
Institute for Physics of Microstructures of RAS,
Friday April 28, 2000, 13.00 h
at MIDIT, IMM, Bldg. 305, Room 018, DTU,
Abstract: The resistive state of a non-resonant long Josephson junction is considered in the framework of the resistive-shunted model. We use an anzatz where the Josephson phase distribution is a quasi-linear function of space and time corresponding to a long junction in a relatively strong magnetic field. The self-consistent equations for both the low-frequency phase and for the high frequency radiated field are obtained. An explicit analytical solution for the small correction is found in the low-damping limit. It gives us the possibility to calculate the power delivered to a load and to find the current-voltage characteristic. It is demonstrated that there are steps on the I-V curve even in the absence of Fiske resonances. The equation for slow phase is analysed in the presence of thermal noise. Using the analytical expression for the electromagnetic field, the radiation spectrum of a non-resonance long Josephson junction is found in the limit of weak noise.