low-noise rotationssymmetrisches elektronenstrahlerzeugungssystem for laufzeitroehren to produce a elektronenstrahles

摘要

933,535. Travelling-wave tubes. C.S.F. COMPAGNIE GENERALE DE TELEGRAPHIE SANS FIL. Sept. 28, 1961 [Oct. 14, 1960; April 18, 1961], No. 34931/61. Class 39 (1). [Also in Group XI] In an M-type travelling-wave tube with an electron gun disposed at one end of the interaction space the cathode structure comprises a number of spaced apart conductors 2, Fig. 1, supporting electron-emissive bands 1. As shown, partition walls 4 negative with respect to the cathode conductors are provided. In other structures, Fig. 3, the emissive bands 1 are separated by cavities 9 and the heater filaments 3 are within cathode cavity 10; Fig. 4, the heater filaments 3 are within ceramic cylinders 11; Fig. 7, the emissive bands 1 face away from the accelerating electrode 5 (Fig. 1), towards an auxiliary anode 14. In modifications of Fig. 7, the conductors 3 instead of being rectangular may be circular or elongated or elliptical in cross-section. In Fig. 12 the conductors 2 lie between inclined partition walls 12. In all embodiments directly-heated instead of indirectly-heated conductors may be used. The tube structure may be linear or circular.