Broadband operation of traveling wave tubes (TWTs) demands the use of nonresonant helix structure as the slow-wave structure (SWS). But there are certain limitations to the power handling capabilities of helical SWS which require rigorous thermal investigations. Further, thermal contact resistances (TCRs) at the interfaces between various parts serve as a detrimental factor inhibiting the efficient thermal conduction in the SWS. Hence, authors have extensively studied the effect of TCRs at various interfaces on the thermal dissipation along with a developed analytical model. Moreover, the systematic thermal analysis of the SWS has been carried out for two different stuffing techniques-hot and cold stuffing, and the results have been compared with the perfect contact scenario. Different support rod materials have also been explored and their corresponding thermal and structural simulations are performed. Based on those results, hot-stuffed SWS performs thermally efficient resulting in 10% better thermal dissipation as compared to the cold-stuffed SWSs. Further recommendations on the support rod material to be used for efficient thermal dissipation are also provided.

中文翻译：

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行波管螺旋 SWS 接触电阻依赖性的热研究


行波管（TWT）的宽带运行要求使用非谐振螺旋结构作为慢波结构（SWS）。但螺旋 SWS 的功率处理能力存在一定的局限性，需要进行严格的热研究。此外，各个部件之间的界面处的热接触电阻（TCR）是抑制SWS中有效热传导的有害因素。因此，作者广泛研究了不同界面处的 TCR 对热耗散的影响以及开发的分析模型。此外，还对两种不同的填充技术——热填充和冷填充——进行了SWS的系统热分析，并将结果与​​完美接触场景进行了比较。还探索了不同的支撑杆材料，并进行了相应的热和结构模拟。根据这些结果，热填充 SWS 具有热效率，与冷填充 SWS 相比，散热效果提高了 10%。还提供了有关用于有效散热的支撑杆材料的进一步建议。