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The non-laminar electron beams having an originally Gaussian current distribution is measured at IECAS, and the electron trajectories without and with RF signal are calculated using BWI code in the presence uniform magnetic and PPM focusing.
In this paper, the design of slow wave structures for an X-band broadband TWT with suppression of backward-wave using the helix pitch step method is present. An optimized design of a high-power X-band broadband TWT with improved BWO suppression and forward-wave saturated output power is presented.
Heat radiator for space traveling wave tube has been analyzed using ANSYS, and has been produced. The heat vacuum test shows that the experiment data agrees well with the simulated one.
This paper reports the design, simulation work and test results of a 150W Ku-band continuous wave space Traveling Wave Tube (TWT), which is fulfilled at the Institute of Electronics, Chinese Academy of Sciences. The double-anode gun, helix pitch-tapering slow wave structure, non-axisymmetric four-stage depressed collector and radiation-cooled radiator are used in this TWT. The test results indicate...
In high-power microwave diode design, the space-charge-limited current is important because of its relation to the diode impedance, and the formation of the virtual cathode. Although the Langmuir-Blodgett law, as a numerical solution, is helpful, a simple functional expression would be more convenient for practical research and the divergence of the series for large Rc/Ra would be avoided. First principle...
This paper presents a study on the mechanism of electronic emission by constructing electronic spread launching model and solving Poisson equation analytically between two planar plane. The results show that electron beam introduces periodic and non-periodic perturbation to primary vacuum potential. The overall effect of periodic perturbation can be ignored because of symmetry but non-periodic perturbation...
This paper presents a comprehensive survey of many evolutionary algorithms for solving multiobjective optimization problems. Four main kinds of multiobjective algorithms (GA, PSO, SA, and AC) have been presented, and their merits and demerits are compared and discussed respectively. Finally, a mix algorithm is suggested as an effective method.
In order to solve the problems of the low query precision and the shortness in understanding user's query intention that occur in traditional search engine, a framework of semantic search engine based on ontology is brought forwards. It need to extract information after the information crawled by the spider, and an algorithm of information extraction based on ontology is proposed. By using semantic...
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