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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...
A microwave pulse compressor with a Magictee as an interference switch is studied. In this compressor, the necessary condition for energy storage in the compressor cavity is frequency-independent, so that the operation in different cavity eigenmodes without any mechanical tuning is possible. RF energy storage and release were simulated numerically. Output pulses in the two frequencies, 2.801 and 2...
Some technical problems were found during the testing and the application of the C-band MBK. These problems include the variation of power-frequency characteristics; the oscillation of high order modes; the breakdown in the electron gun and the microwave leak at the collector insulator. These technical problems were caused by the evaporation of the cathode, attenuating material and the copper, or...
In this paper, design of the interaction structure to generate 2THz radiation at second cyclotron harmonic is presented. Based on start oscillating current and stability at high magnetic field, TE24,4 is selected as operating mode. The eigen mode analysis and beam wave interaction in the interaction structure have been carried out using MAGIC and CST-Microwave Studio.
An RF window design of a 350 kW CW X-band klystron is described. The window has dielectric barrier made of pyrolitic boron nitride. The microwave power is transmitted through the barrier in the TM11-mode of the circular waveguide.
Based on the mode-matching technique and simulation software CST, this paper analyzes and simulates the input cavity of gyroklystron amplifier, and gets the structure model of TE01 mode W-band gyroklystron input cavity. Then it contrasts the influence of the size of coupling slots to the coupling frequency and Q-value.
The analysis for the parasitic mode excitation is performed for gyrotron beam tunnel. Scattering matrix simulations are performed for the initial design of the beam tunnel. Here only the symmetric TE modes are observed due to the week damping inside the tunnel. Various approaches are used for investigation of parasitic mode excitations.
We offer to use slow-wave structures (SWSs) for monitoring parameters of absorbing coatings, which are widely used for stealth technology. It is shown that resonant frequencies and Q-factor of a SWS section placed in parallel to a monitored coating strongly depend on the electric and magnetic properties of the coating, that dependence can be converted in the coating's parameters reading.
Numerical simulations using Magic 3-D have been conducted on a promising three cavity gyro-multiplier arrangement. Results have predicted output of the 4th harmonic, at a frequency of 1.37 THz, with output powers on the order of 100 W.
In order to build an X-band sheet beam klystron with the peak output power of 5 MW, a high frequency structure has been designed through the three dimensional particle-in-cell simulations. The design method is consist of two steps, which are firstly finding a stable single-arm output cavity with the high energy extraction ability and secondly constructing a multi-cavity bunching section to produce...
An RF pillbox-type window for a broadband multibeam Ka-band klystron whose cavities operate in higher mode is described. The window has a thick vacuum-tight barrier made of pyrolitic boron nitride. Its S-parameters are stable in respect of the barrier dielectric permittivity dispersion due to the energy transmission in the TM01-mode of the circular waveguide.
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