Abstract

A grid component (20) for use with a vacuum electron device (VED), such as an inductive output tube (IOT), includes a skirt (2S) that adds structural support and aids in alignment. The grid component has a dome (22) in which a grid pattern is formed and includes an annular, concentric flange (24) surrounding the dome. The skirt is formed concentrically around the flange. Alignment orifices (30) may be provided in the flange for passage of alignment pins in the assembled product. The grid, flange, and skirt are a unitary component and are formed by a chemical vapor deposition (CVD) or similar process, in which a mandrel is used to provide a deposition surface. The mandrel is. placed in a furnace, and a high-temperature CVD process is used to break down a hydrocarbon gas to thereby deposit a pyrolytic graphite coating onto the mandrel. The mandrel may include a skirt template to provide the characteristic skirt.

IPC Classes  ?

• H01J 1/46 - Control electrodes, e.g. gridAuxiliary electrodes
• H01J 9/14 - Manufacture of electrodes or electrode systems of non-emitting electrodes
• H01J 23/065 - Electron or ion guns producing a solid cylindrical beam
• H01J 25/04 - Tubes having one or more resonators, without reflection of the electron stream, and in which the modulation produced in the modulator zone is mainly density modulation, e.g. Haeff tube

Abstract

A terahertz sheet beam klystron (TSBK) includes an electron gun configured to generate a sheet electron beam and a drift tube through which the sheet beam is propagated. The drift tube is provided with multiple resonant cavities and includes a drift tube circuit including an input RF circuit through which an input RF signal is introduced and an output RF circuit through which an output RF signal is extracted, a collector, and a vacuum envelope. The output RF circuit is configured such that Qe (extraction Q) of the drift tube circuit is comparable to Q0 (unloaded Q) of the drift tube circuit, thereby improving the efficiency of the drift tube circuit.

IPC Classes  ?

• H01J 25/10 - Klystrons, i.e. tubes having two or more resonators, without reflection of the electron stream, and in which the stream is modulated mainly by velocity in the zone of the input resonator

Abstract

An electrode of an inductive output tube (IOT) is provided with channels for guiding cooling fluid. In one aspect of the invention, the channels are in a confronting relationship with a jacket surrounding the electrode and spaced from the electrode so as to define an interior region. Cooling fluid such as oil is circulated in the channels in fluid communication with the interior region, providing an escape mechanism for trapped bubbles in order to prevent localized heating of the electrode. In another aspect of the invention, the channels form multiple intersecting helical patterns of different pitches, with the steeper-pitched channels providing a more direct escape route for the bubbles.

IPC Classes  ?

• H01J 7/26 - Cooling arrangementsHeating arrangementsMeans for circulating gas or vapour within the discharge space by flow of fluid through passages associated with tube or lamp