Non-Linear Wave Phenomena in Josephson Elements for Superconducting Electronics

Download or read book Non-Linear Wave Phenomena in Josephson Elements for Superconducting Electronics written by P. L. Christiansen and published by . This book was released on 1985 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: The long and intermediate length Josephson tunnel junction oscillator with overlap geometry of linear and circular configuration, is investigated by computational solution of the perturbed sine-Gordon equation model and by experimental measurements. The model predicts the experimental results very well. Line oscillators as well as ring oscillators are treated. For long junctions soliton perturbation methods are developed and turn out to be efficient prediction tools, also providing physical understanding of the dynamics of the oscillator. For intermediate length junctions expansions in terms of linear cavity modes reduce computational costs. The narrow linewidth of the electromagnetic radiation (typically 1 kHz of a line at 10 GHz) is demonstrated experimentally. Corresponding computer simulations requiring a relative accuracy of less than 10 to the -7th power are performed on supercomputer CRAY-1-S. The broadening of linewidth due to external microradiation and internal thermal noise is determined. Keywords include: Cavity mode; Chaos; Fiske steps; Hysteresis; Intermittency, Josephson fluxon oscillator; Josephson ring oscillator; Josephson tunnel junction; Noise rise; Perturbation theory; Radiation line-width; Sine-Gordon equation (perturbed); Solition (fluxon); SQUID; Subharmonics; and Zero field stages.