Abstract:
The invention relates to a cooling device for an electron tube designed to amplify a high frequency signal. The invention is particularly suitable for cooling electron tubes that amplify radio frequency signals used for television or for radio. The electron tube (100) is installed on a portal frame (101) designed to hold it. The device comprises a first hydraulic circuit (103) inside which a first fluid circulates to cool at least part (8, 15) of the tube (100). The device also comprises a fluidnullfluid exchanger (104) to transfer heat transported by the first fluid to a second hydraulic circuit (120). The exchanger (104) is also located on the portal frame (101).
Abstract:
Nonlinear current modulation of a relativistic electron beam is achieved byts propagation without interruption through a resistive wall type of drift tube assembly within a klystron amplifier. Maximized beam current modulation is thereby attained for a beam propagation distance within a shortened drift tube.
Abstract:
An amplifying arrangement includes a klystron in which an electron beam interacts with a high frequency signal to produce a modulated amplified signal. The high frequency signal is maintained at a substantially constant amplitude and modulation of the amplified signal is provided by controlling the electron beam current.
Abstract:
A method of adjusting a phase shift in an amplification multicavity klystron comprises the steps of tapping a portion of signal from output and intermediate resonators of a klystron, adding up the tapped signals, adjusting the amplitudes and phases of the tapped signals so that said signals have equal amplitude but opposite phases with the klystron operating under nominal conditions and applying the sum signal to an input resonator whereupon anode voltage is varied until a phase shift in the klystron changes, the subsequent step being the selection of the phase of the sum signal to provide for a minimum phase-shift variation in the klystron. A device for executing the proposed method of adjusting a phase shift includes a line composed of a phase shifter, an adder, and an additional phase shifter. One input of the phase shifter is connected to the output resonator of the klystron, while the other input thereof is coupled to the adder. The additional phase shifter is connected to the input resonator of the klystron and to the adder, whereas the adder is coupled to the phase shifters and to the intermediate resonator of the klystron.
Abstract:
A linear beam tube has an input section, a buffer or buncher section, and an output section.The buffer or buncher section comprises two circuits in series, each of which (FIG. 5) comprises two resonant cavities C51 and C52 through which the electron beam passes and a third resonant cavity C53 coupled to cavity C51 by a slot 53 and to cavity C52 by a slot 54.The output section (FIG. 2a) comprises two resonant cavities C1 and C2 through which the beam passes and which are coupled by a slot 5. A third resonant cavity C3 is coupled to cavity C2 by an iris 13, and to an output waveguide 14 by a further iris 15.The input section may comprise a travelling wavetube section, or the series arrangement of a standard klystron cavity and two buffer sections as shown in FIG. 5.Slot or iris couplings may be replaced by a loop coupling as known in the art.The resulting amplifier has an improved bandwidth/efficiency product.
Abstract:
A multi-cavity type velocity modulation tube, operable in the K-band above 10 GHz and having input, pre-buncher, buncher and output cavities which are respectively tuned to frequencies that are higher than the upper end of the operating pass band; near the upper end of the operating pass band and lower than the resonant frequency of the input cavity; higher than the resonant frequency of the input cavity; and within the operating pass band of the tube. The input cavity Q-value is lower than that of the prebuncher cavities.Preferably first and second prebuncher and first and second buncher cavities are provided, the second prebuncher and at least one of the bunchers are unloaded and the second prebuncher is tuned to a frequency in the vicinity of the lower end of the operating pass band.The design yields a low cost tube having a significantly improved gain-bandwidth product.