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现正研制S波段高峰值功率电平复合式反同轴磁控管。本报告讨论该管在40毫微秒窄脉冲(窄脉冲形成网络)条件下的实验特性、空气预击穿的研究结果以及为将脉宽扩展到250毫微秒所做的改进。窄脉冲工作时,该管的峰值功率约为500到800兆瓦。利用选通脉冲技术和固态色散线测得的频率为3.24千兆赫。实验系统(不带谐振腔)能产生高峰值电场强度E_p=5×10~4伏/厘米,这样便完全有可能对空气击穿时等离子体内的微波互作用和能量吸收情况进行研究。通过监测最终的等离子体的密度及其光输出,观察到了压强高至100托时的空气击穿现象。在压强为10托时,等离子体密度约为100n_c,其中n_c是当微波频率等于等离子体频率时的临界等离子体密度。当采用一种新的脉冲形成网络时(此时可将击穿现象视为流体力学击穿效应而加以研究),复合式反同轴磁控管的工作脉宽将扩展到250毫微秒。为使磁控管宽脉冲工作所做的一个特别重大的改进是使用了一种新颖的高压接头。新近研制成功的一种园波导TE_(on)型模耦合器,或称高压接头,允许把位于大直径管子内长度为8英寸的输出波导分成两段,它既可非常有效地传输高频能量,又能保证直流绝缘。
S-band is now being developed high peak power level composite anti-coaxial magnetron. This report discusses the experimental characteristics of this tube at 40 nanosecond narrow pulses (Narrow Pulse Forming Network), the results of air pre-puncture studies, and the improvements made to extend the pulse width to 250 nanoseconds. When working in a narrow pulse, the tube’s peak power is about 500 to 800 MW. The frequency measured using strobe technology and solid state dispersion was 3.24 GHz. Experimental system (without resonant cavity) can produce high peak electric field E_p = 5 × 10-4V / cm, so that it is entirely possible to study the microwave plasma interaction and energy absorption during air breakdown. By monitoring the final plasma density and its light output, air breakdown was observed at pressures as high as 100 Torr. At a pressure of 10 Torr, the plasma density is about 100 n-c, where n_c is the critical plasma density when the microwave frequency is equal to the plasma frequency. When a new pulse-forming network is used, where breakdown can be considered as a fluid-mechanical breakdown effect, the operating pulse width of a composite anti-coaxial magnetron will be extended to 250 ns. A particularly significant improvement for making magnetron wide pulse work is the use of a novel high voltage connector. A newly developed Park Waveguide TE mode coupler, or high pressure connector, allows the output waveguide to be split into two lengths of 8 inches in a large diameter tube, which can transmit high frequency energy very efficiently , But also to ensure DC insulation.