Design of the radio frequency section of a multiple beam klystron working in the J-band frequency range
The multiple beam klystrons (MBK) offer some distinct advantages over their single beam versions including higher average power, relatively lower operating voltages, higher bandwidth and low individual beam current. In this paper the design of the radio frequency (RF) section of a multiple beam klystron working in the J band frequency range is presented. The RF design and simulation has been carried out using a commercially available three dimensional electromagnetic design code. A cold test model of the RF cavity has been fabricated and its resonant frequency has been characterized. Design of the individual cavities, simulation results of the beam wave interaction as well as the frequency characterization of the fabricated cavity is presented in this paper.
Multiple-beam klystron amplifiers: performance parameters and development trends
This paper presents a description of multiple-beam klystrons (MBKs). The main material is based on experimental results and practical experience gained at the Federal State Unitary Enterprise Research and Production Corporation "Istok," where MBK technology has been extensively developed and manufactured beginning in the 1960s. In addition to this material, some original ideas, designs, and experimental data from other enterprises are presented. Three classes of MBKs are discussed in detail: high-power, medium-power, and miniaturized devices. Features common to all MBK classes as well as the reasons constraining MBK parameters in comparison with the parameters of single-beam klystrons are also discussed. The principal characteristics of typical MBKs are presented and main application areas for different MBK types are considered. Finally, directions for further development of this branch of microwave amplifiers are discussed.
Multiple beam klystrons
The advantages of multiple beam klystrons (MBK) for consumers are low operating voltage with high power and efficiency at wide instantaneous bandwidth. The features of MBK for designers are low individual beam perveance, together with low total electron stream resistance. That helps obtain the high electronic and circuit efficiency. At the same time MBKs have difficulties in design. Some remedies are indicated. In spite of these difficulties, the author produced very successful low-voltage long-life MBKs for radar and communications applications.