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Pulse shortening in high-peak-power Reltron tubes

机译:高峰值功率Reltron管中的脉冲缩短

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Abstract: Most high-peak-power ($GREQ 100 MW) microwave tubes are seemingly limited to an output RF energy per pulse of about 100 J. While Titan's L-band Reltron tubes have achieved 250 J/pulse, we have also observed pulse-shortening phenomena in both the modulating cavity and output cavity regions. We have examined the effects of construction materials, fabrication techniques, vacuum pressure, and conditioning. We will present data from these experiments and discuss a plausible pulse-shortening hypothesis involving electric- field-induced gas evolution and subsequent ionization. We believe that our energy-per-pulse limitations are the result of our current tube construction approach which uses explosive emission cathodes, plastic insulators, and grids to define cavity boundaries. While some simple extensions of this approach offers some hope for increasing the energy per pulse to perhaps 500 joules in L-band, we believe that achieving $GREQ 1 kJ/pulse will require the use of conventional microwave tube construction techniques, including thermionic cathodes, ceramic insulators, and brazed joining with high-temperature bakeout. We will present the design of an L-band Reltron tube having these features.!11
机译:摘要:大多数高峰值功率($ GREQ 100 MW)微波管似乎仅限于每脉冲约100 J的输出RF能量。虽然Titan的L波段Reltron管已达到250 J /脉冲,但我们也观察到了脉冲-在调节腔和输出腔区域中的短路现象。我们检查了建筑材料,制造技术,真空压力和调节的影响。我们将提供来自这些实验的数据,并讨论涉及电场引起的气体逸出和随后电离的合理的脉冲缩短假设。我们认为,我们每脉冲能量的限制是我们当前的管道构造方法的结果,该方法使用爆炸性发射阴极,塑料绝缘体和网格来定义腔体边界。虽然此方法的一些简单扩展为将每个脉冲的能量增加到L波段中的500焦耳提供了一些希望,但我们认为,达到$ GREQ 1 kJ /脉冲将需要使用常规的微波管构造技术,包括热电子阴极,陶瓷绝缘子,并通过高温烘烤进行钎焊连接。我们将介绍具有这些功能的L波段Reltron电子管的设计!! 11

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