Electron beam plasma amplifier with a wave-guide coupling

• Main Authors: WEIMER KARL RICHARD ULRICH, VLAARDINGERBROEK MARINUS TEUNIS
• Format: Patent
• Language: English
• Published: 20.09.1966
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS; ELECTRICITY

959,421. Space-charge wave tubes. ionization chambers; thermionic - cathode tubes. PHILIPS ELECTRICAL INDUSTRIES Ltd. Jan. 10, 1962 [Jan. 13, 1961], No. 923/62. Headings H1D. In an electron beam forward wave amplifier tube there is an input coupler, an output coupler and means for producing a plasma by the interaction of which with the electron beam the signal amplification is obtained, one of the couplers being located within the plasma and is constructed in a form suitable for connecting to a waveguide. The couplers may be probes 5, 6 (as shown), or waveguide sections, one of which is traversed by a probe, Fig. 2 (not shown). The plasma frequency is not less than and is preferably equal to the signal frequency. If desired, both the couplers are located within the interaction space of the plasma and of the electron beam. A collector may or may not be provided; in the latter case the electron beam terminates by collision of the beam electrons with the plasma particles. The beam collector may be the plasma cathode, and the plasma may be obtained by a discharge, in mercury vapour at a pressure of 2.10-3 Torr., between an anode 2 and a thermionic cathode 3. Alternatively, Fig. 2 (not shown), the thermionic cathode 3 may be replaced by an anode, and a discharge extends between electrode 2, which acts as a cold cathode, and the anode electrode.