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The fundamental method of the design of an ultra-broadband helix traveling wave tube (TWT) with two-section output circuit was analyzed using Pierce small signal theory, and shaped a special helix pitch profile with reduced phase-velocity followed by a positive phase-velocity taper. The slow wave structure with semi-metallic rods, which has good thermal dissipation capability and gives negative dispersion...
Two new Ka-band traveling wave tubes (TWTs), included a narrow band 40W with 50% efficiency and a 26.5-40GHz 100W with 30% efficiency, has been designed and tested at the Institute of Electronic, Chinese Academy of Sciences (IECAS).
Computer simulation of beam-wave interaction of helix TWTA is always the most important and complicated part during the industrial design progress. For the purpose of setting simulation parameters fast and accurately, it is adopted Particle-In-Cell technique and Finite Difference Time Domain method to program in C against this research. In addition, the total number of cells is more sensitive than...
A 2.5D multifrequency large signal beam-wave reaction code of TWT based on the field theory is developed for crossmodulation and intermodulation products, in which space charge fields are obtained through solving discrete Helmholtz equations with the help of Particle-in-cell method. Two-tone experiment and simulation of L band space helix-TWT shown that a good agreement in CM and IM products.
A new 26.5-40 GHz helix-TWT with high efficiency has been developed at the Institute of Electronic, Chinese Academy of Sciences, China. The main methods include the optimization of slow wave structure and large signal simulation, and a special 5-stage multistage depressed collector to increase power recovery. The test results show that this device has an average power of 40 W, a gain of more than...
In this paper, the design of a Ku-band 110-kW gyrotron traveling wave tube (gyro-TWT) amplifier with the operating mode TE11 is presented. The optimum interaction structure circuit of the gyro-TWT with distributed wall losses is derived from the self-consistent nonlinear code on the basis of the dispersion relationship and the linear theory. The effects of the parameters such as input power, driver...
A new experimental evaluation method is presented for evaluating and comparing the heat dissipation capability of the slow-wave structures (SWSs) of helix traveling-wave tube (TWT). The practicality and simplicity of the evaluation method have been validated through experimental tests in some components with different assembling and processing methods, such as the cold stuffing, the heat shrink, the...
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