高增益相对论速调管放大器杂模振荡抑制研究  

Investigation of suppression of non-working mode oscillation in a high gain relativistic klystron amplifier

作　　者：陈永东[1,2] 金晓[2] 李正红[2] 黄华[2] 吴洋[2] 

机构地区：[1]中国工程物理研究院研究生部,北京100084 [2]中国工程物理研究院应用电子学研究所,高功率微波技术重点实验室,绵阳621900

出　　处：《物理学报》2012年第22期511-515,共5页Acta Physica Sinica

摘　　要：由于杂模在高增益相对论速调管放大器中很容易激发,而且严重影响工作模式的束波互作用,因此,杂模抑制在高增益相对论速调管放大器中非常重要.杂模的激发不仅影响高增益相对论速调管放大器的正常工作,而且导致脉冲缩短等,大大降低速调管的工作性能.本文结合粒子模拟深入研究了杂模产生的机理,建立了激发杂模振荡的腔间耦合模型及其相应的等效电路,由此给出了杂模激发的起振电流公式和抑制措施,并且在PIC模拟中进行相应的模拟验证和优化处理,最后,在千瓦级驱动源驱动下,实验上实现了对杂模的控制,得到微波功率0.98GW,脉冲宽度100ns的实验输出.Because non-working modes are very easy to excit in the high gain relativistic klystron amplifier, and seriously affect the beam- wave interactive action, the suppressing of non-working modes is very important. These modes can seriously degrade klystron perfor- mance and cause the pulse shortening, the normal operation of HGRKA will be affected greatly. This paper deals with the mechanism of non-working mode self-excitation by the PIC simulation, and it is obvious that the coupling between cavities is the main cause of non-working mode self-excitation. The coupling can form the positive feedback loop. The formula for starting current of non-working mode self-excitation is developed according to the coupling between cavities, and the corresponding measures are taken to avoid non- working mode self-excitation. Then the corresponding simulations and optimization are conducted. Finally non-working mode control is realized in the HGRKA experimentally when driven power is only few kilowatts. The RF output has a power of 0.98 GW and pulse width of 100 ns.

关 键 词：高功率微波 高增益相对论速调管 杂模振荡 

分 类 号：TN122[电子电信—物理电子学]