Thermal Analysis of a Helix TWT Slow-Wave Structure

Chinese Acad. of Sci., Beijing
IEEE Transactions on Electron Devices (Impact Factor: 2.47). 06/2008; 55(5):1269 - 1272. DOI: 10.1109/TED.2008.919536
Source: IEEE Xplore


A novel and effective analytical method using ANSYS has been developed for studying the heat-dissipation capability of a helix traveling-wave-tube slow-wave structure (SWS). This method, which is based on calibrating theoretical calculations with experimental data, is able to precisely predict the SWS heat dissipation, thereby reducing material costs and saving time. The consistency and feasibility of this method have been verified by experimental tests on SWSs using copper-plated helices and both BeO and BN support rods.

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    • "The helix temperature is dissipated through the dielectric support rods – symmetrically arranged around the helix (Figure 1), to the environment/heat sink.[1] [2] [3] [4] [5] [6] [7] In both analysis and simulation, it is assumed that helix temperature is dissipated by conduction in the radial direction only and no heat flows axially. Also, effect of spot heating by the electron beam is neglected. "
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    ABSTRACT: In this paper, an approach has been presented to estimate thermal contact resistance (TCR) between helix slow-wave structure to support rod and support rod to metal envelope to study the effective heat dissipation from the helix. Based on this method, TCRs are optimized by comparing analytically and experimentally estimated helix temperature with those obtained from ANSYS simulation. Helix temperature, at a given power loss in the helix, is obtained by varying the fraction of effective resistance between helix and support rod for a given fraction of effective resistance between support rod to barrel envelope and vice versa. This helix temperature has been compared with the measured temperature to predict the TCRs.
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    ABSTRACT: Two assembling methods, i.e., the sputter brazing method and the diffusion brazing method, have been developed for improving the heat dissipation capability of the helix traveling-wave tube slow-wave structure (SWS). The magnetron sputter plating technology and the pressure diffusion technology are employed in this letter to complete the SWS assembly. The effect of these two methods on the thermal conduction of the SWS was verified by several experimental tests. These two methods being pursued enable better heat dissipation capability of the helix SWS, compared to the conventional nonbrazing methods.
    No preview · Article · Sep 2008 · IEEE Electron Device Letters
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    ABSTRACT: The thermal interface resistivity (TIR) of the helix slow-wave structure (SWS) is studied theoretically and experimentally. The effects of the TIRs at different interfaces on heat dissipation capability of the SWS have been analyzed and compared using ANSYS. The TIRs at the helix-rod interface and the rod-barrel interface have been calculated respectively with the developed equations and the measured component temperatures, considering the temperature- -dependent material properties. The effects of the rod material and the assembly method on the TIRs of the SWS were analyzed and compared.
    No preview · Conference Paper · May 2009
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