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.
Design and Simulation of Pole Piece for Focusing of Multi-beam Electron Gun
The design of the aperture in the pole piece of a multi-beam confined-flow electron gun has been studied using the commercially available code OPERA 3D and validated the results using the CST particle studio, and the OmniTrak simulation tools. The results obtained by these tools are in good agreement with respect to the beam-waist radius and the throw of the electron gun. The square aperture proved to be a better option than circular aperture in providing the axisymmetric and uniform magnetic field. The shape and size of the pole piece have been optimized to enhance the laminarity of the electron beam using square aperture.
Multiple-beam microwave tubes
The production of multiple-beam microwave tubes at the Russian research and production company ISTOK is discussed. MBKs (multiple-beam klystrons). TWTs (traveling wave tubes), and BWOs (backward wave tubes) provide low operating voltages, high power, low noise, and the possibility of larger operating bandwidth. The devices discussed include MBKs, pulsed multimode multiple-beam TWTs, and multiple-beam BWOs operating at wavelengths as short as 0.2 mm. These studies have shown that the use of multiple-beam designs provides a powerful means for improving the parameters of microwave tubes.<<ETX>>