[{"type":"article-journal","title":"Radiation linewidth of a long Josephson junction in the flux-flow regime","issued":{"date-parts":[["1996"]]},"volume":"46","page":"573\u2013574","container-title":"Czechoslovak journal of physics \/ Supplement 2","DOI":"10.1007\/BF02583594","author":[{"family":"Golubov","given":"A. A."},{"family":"Malomed","given":"B. A."},{"family":"Ustinov","given":"A. V."}],"ISSN":"0009-0700, 0011-4226, 0011-4626, 1572-9486","abstract":"Theoretical model for the radiation linewidth in a multi-fluxon state of a long Josephson junction is presented.\r\nStarting from the perturbed sine-Gordon model with the temperature dependent noise term, we use a collective\r\ncoordinate approach in order to calculate the finite radiation linewidth due to the internal degrees of freedom\r\nin the moving fluxon chain. At low fluxon density, the radiation linewidth is expected to be substantially\r\nlarger than that of a lumped Josephson oscillator. With increasing the fluxon density, a crossover to a much\r\nsmaller linewidth approaching the lumped oscillator limit is predicted.","kit-publication-id":"1000075684"}]