多注毫米波行波管收集极的热设计

 为解决多注毫米波行波管收集极的散热问题，保障行波管工作可靠性与稳定性，利用 ANSYS 有限元软件模拟分析了收集极的传热特性，针对性地调整和优化了收集极相关参数与结构。研究结果表明：接触热阻是造成收集极具有较高温升的一个重要因素，由接触热阻所造成的温升约占收集极内外温度差的1/3；并不是第二电极与磁环接触宽度越宽所对应的收集极散热能力就越强，而是在一定工作条件下其散热能力存在极限值；对于绝缘陶瓷材料，应根据绝缘陶瓷的温度特性以及行波管的功率大小来进行选择；翼片式散热器是一种符合设计要求的理想散热结构。

Thermal design of collector for multi-beam millimeter-wave traveling wave tube

In order to improve cooling capability of the collector and guarantee the multi-beam millimeter-wave traveling wave tube’s reliability and stability, thermal analysis of the collector with finite element software ANSYS is performed and simulation results are provided to obtain the main guidelines for thermal design of collector. The size, material and even structure of the collector are optimized. The results show that: (1) Thermal contact resistance is a major factor for the collector temperature rise. The temperature rise caused by thermal contact resistances is about one-third of the total; (2) Larger width of electrode contact with insulating ceramics might not correspond with stronger collector cooling capacity, there is a limit for the cooling capacity under certain work conditions;