Title :
Self-excitation conditions in overmoded klystrons
Author :
Nusinovich, G.S. ; Read, M.E. ; Song, L. ; Ives, R.L.
Author_Institution :
Calabazas Creek Res., Inc, Saratoga, CA, USA
Abstract :
A general method for calculation of the start currents of modes of overmoded cavities in klystrons is described. The method is applicable to klystrons with an arbitrary geometry of electron beams and cavities with large transverse and/or axial dimensions. When these dimensions are on the order of the wavelength or larger, the spectrum of mode frequencies is rather dense. Therefore, in addition to the desired mode, electrons can excite some parasitic modes. The conditions of self-excitation of various modes are formulated and applied to closed (gridded) and open (non-gridded) cavities.
Keywords :
cavity resonators; electric current; electron beams; klystrons; arbitrary klystron geometry; axial dimensions; cavity geometry; closed gridded cavities; electron beams; mode frequency spectrum; open nongridded cavities; overmoded cavity modes; overmoded klystrons; parasitic modes; self-excitation conditions; start currents; transverse dimensions; Contracts; Electron beams; Equations; Geometry; Klystrons; Optical coupling; Polynomials; Probability distribution; Radio frequency; Technological innovation;
Conference_Titel :
Vacuum Electronics Conference, 2004. IVEC 2004. Fifth IEEE International
Print_ISBN :
0-7803-8261-7
DOI :
10.1109/IVELEC.2004.1316278
