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维里安公司研制出一种新的空气冷却耦合腔行波管 VTU-6691A2。此管的连续波功率高达2千瓦。此管采用具有一个调制阳极的电子枪,该阳极工作于地电位或通过一个电阻分配网络工作于低电流。这种电子枪与一些 Ku波段耦合腔行波管、速调管以及 VTC-6363C1耦合腔 C 波段行波管中使用的类似,运用寿命达50,000小时。VTU-6691A2行波管采用开口框架磁铁,大大改进了机械设计特点。这种结构对管子和磁铁可进行很好的冷却,因而有助获得长期的可靠性。这种磁铁结构,在输入和输出传输线以及切断负载传输线上不必使用弯曲波导。
Vivalion has developed a new air cooled coupled cavity TWU-6691A2. This tube of continuous wave power up to 2 kilowatts. The tube uses an electron gun with a modulated anode operating at ground potential or operating at a low current through a resistively distributed network. This gun is similar to some Ku-band coupled cavity TWTs, klystrons and VTC-6363C1 coupled-cavity C-band TWTs with an operating life of 50,000 hours. VTU-6691A2 traveling wave tube with open-frame magnet, greatly improving the mechanical design features. This structure provides good cooling of the tube and the magnet, thus helping to achieve long-term reliability. This magnet structure eliminates the need to use curved waveguides on the input and output transmission lines and on the cut-off load transmission lines.