GB601011A - Improvements in or relating to electron discharge devices - Google Patents

Abstract

601,011. Velocity-modulation tubes. RAYTHEON MANUFACTURING CO. April 28, 1944, No. 8058. Convention date, Nov. 26, 1941. [Class 39 (i)] A velocity-modulation electron discharge device comprises two or more sections having cylindrical symmetry, each having a central thermionic cathode 2. Each radial electron beam passes through a pair of grids formed respectively by rods 24 secured to the inner wall of a resonance chamber A and rods 19 secured to the inside of an annular ring 17 forming part of the resonance chamber. In the form shown, the beam thereafter passes through a pair of grids formed respectively by rods 16 connected to the outside of an annular ring 14 forming part of a resonance chamber B and rods 9 connected to the outer wall of the resonator. A collector electrode 25 is electrically and mechanically connected to by conductors 26 a cathode lead 3. The beam is velocity modulated by the grids 24, 19 and energy is extracted from the bunched beam by the resonator B. The two sections are connected by intermediate resonance chambers A<1>, B<1> as shown. The inner and outer resonance chambers may be coupled as shown at 27 in the lower section A<11>, B". Energy is withdrawn from the outer resonance system by a loop 30. In a modification, energy is withdrawn by a concentric transmission line passing radially through the envelope. The resonance system is connected positively with respect to the cathode to a potential which may be of the order of 1000 volts. This cathode filament may be of fluted section so as to concentrate the beam between the rods of the first grid. The grid rods may be hollow for passage of cooling water. The Specification as open to inspection under Sect. 91 describes also a device having cylindrical symmetry, but with only one radial electron beam. This subject-matter does not appear in the Specification as accepted.