Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.cplire.ru/html/lab234/pubs/2005-05.pdf Дата изменения: Tue Jan 24 10:05:05 2006 Дата индексирования: Tue Oct 2 08:01:55 2012 Кодировка: Поисковые слова: m 101

Submitted for the pi-shift Workshop "Physics of Superconducting Phase Shift Devices", Ischia (Napoli), 2-5 April 2005. Simple theory for the spectral linewidth of the mm-wave Josephson Flux Flow Oscillator J. Mygind* and M. R. Samuelsen Department of Physics, B309, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark. V. P. Koshelets and A. S. Sobolev Institute of Radio Engineering and Electronics, RAS, Moscow, Russia *Corresponding author. e-mail: myg@fysik.dtu.dk A review is given of recent experimental and theoretical understandings of the spectral linewidth of the Flux Flow Oscillator (FFO). It is a long Josephson junction in which a DC bias current and a DC magnetic field maintain a unidirectional viscous flow of magnetic flux quanta. For the "bare" junction the linewidth of the electromagnetic radiation generated at the end boundary is theoretically given by the usual {\it lumped} junction expression. Experimentally, the FFO linewidth deviates significantly both in magnitude and functional dependence. This has been a challenge for over two decades. We suggest a solution based on the assumption that the bias current creates an additional magnetic field in the junction. Recent measurements with different bias configurations are presented. Work supported in parts by INTAS 211 0367, 211 0686, ISTC project 2445, TAO of Japan, and the Hartmann Foundation. Preferred presentation: Oral