向内发射同轴虚阴极振荡器的优化  

Optimization of an inward-emitting coaxial vircator

作　　者：邢庆子[1] 王冬[1] 黄峰[1] 邓景康[1] 

机构地区：[1]清华大学物理系,北京100084

出　　处：《清华大学学报（自然科学版）》2006年第12期2024-2027,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家"八六三"高技术项目(G2002AA837110)

摘　　要：为提高虚阴极振荡器微波能量转换效率,使用2.5维全电磁P IC(particle in ce ll)软件对向内发射同轴虚阴极振荡器进行数值模拟,优化设计了阳极反射板与阴极发射区之间距离D,并研究了阳极网透射区宽度B对能量转换效率的影响。模拟发现:选取适当的D值可提高效率,同时随着B的增大,能量转换效率逐渐增大并趋近一稳定值。模拟所得微波振荡主频与理论值符合较好。优化结果为:在阴、阳极半径分别为7 cm和5.5 cm,二极管电压250 kV,电流20 kA条件下,得到主频3.45 GH z,3 dB带宽约3%,微波功率310MW,能量转换效率6.8%的窄带微波输出。An inward-emitting coaxial vircator was simulated numerically using a code 2, 5 dimension PIC （partieal in cell） to optimize the structural parameters and to enhance the energy conversion efficiency. The simulation optivcizes the distance D between the anode reflector and the center of the emission area on the cathode. The influence of the transparency width B of the anode foil on the efficiency was also studied. The results show that higher effieieneies can be obtained by choosing appropriate D values and that the efficiency increases gradually with increasing B. The dominant frequency is consistent with theoretical predictions. The optimized result has a dominant frequency of 3. 45 GHz with 3 bandwidth （3 dB）, a power of 310 MW, and a conversion efficiency of 6.8% with a cathode radius of 7 cm, an anode radius of 5.5 cm, a diode voltage of 250 kV, and a current of 2C kA.

关 键 词：同轴虚阴极振荡器 微波振荡主频 数值模拟 高功率微波 

分 类 号：TN752[电子电信—电路与系统]