100 W Operation of a Cold Cathode TWT
100 W Operation of a Cold Cathode TWT
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DOI：
10.1109/ted.2009.2015614
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发表时间：
2009-05-01
影响因子：
3.1
通讯作者：
Spindt, Charles A.
中科院分区：
文献类型：
--
作者：
Whaley, David R.;Duggal, Ramon;Spindt, Charles A.
最近的低电压高电压场致发射体阵列操作演示为成功开发可靠的冷阴极真空电子器件技术提供了希望。本文报道了C波段中等功率行波管（TWT）的场发射体阵列作为电子源的实验研究。冷阴极行波管在占空比高达10%，束流高达121 mA，射频功率高达100 W，频率为5 GHz的情况下运行了150 h以上。同时实现了15.4 A/cm（2）的高阴极电流密度和出色的束流控制，在零RF驱动操作条件下实现了99.4%的束流传输，在最大RF输出功率下实现了97.3%的传输。阴极被示出为从上一代的发射器制造的SRI国际的工作电压降低了72%，使工作电压为全电流操作远低于100 V.广泛的设备特性和寿命测试已经进行，并观察到有趣的变化阴极性能在高负荷高电流部分的测试程序。这里给出的结果代表了最高的电流，最高的功率，和最高的占空因数的RF真空器件采用场发射冷阴极电子源的报道。
Recent demonstration of low-voltage high-transconductance field emitter array operation holds promise for the successful development of reliable cold cathode vacuum electronics device technologies. This paper reports on the experimental studies of implementation of such field emitter arrays as the electron source for a moderate power traveling wave tube (TWT) operating in the C-band frequency regime. The cold cathode TWT has operated for over 150 h at duty factors up to 10%, beam currents up to 121 mA, and RF powers up to 100 W at 5 GHz. High cathode current densities of 15.4 A/cm(2) were achieved concurrent with excellent beam control, resulting in 99.4% beam transmission under zero-RF-drive operating conditions and 97.3% transmission at maximum RF output power. The cathode is shown to operate with a 72% reduction in the operating voltage from the previous generation of emitters fabricated by SRI International, bringing the operating voltage for full current operation well below 100 V. Extensive device characterization and life testing has been performed, and interesting variation in cathode performance was observed during the high-duty high-current portion of the testing program. The results presented here represent the highest current, highest power, and highest duty factor ever reported for an RF vacuum device employing a field emission cold cathode electron source.