Pulsewidth Limitation in the Relativistic Backward
Pulsewidth Limitation in the Relativistic Backward
复制标题
DOI：
--
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
S. Korovin;G. Mesyats;I. Pegel;S. Polevin;V. Tarakanov
中科院分区：
文献类型：
--
作者：
S. Korovin;G. Mesyats;I. Pegel;S. Polevin;V. Tarakanov
在实验和理论上研究了在吉瓦功率水平下相对论返波振荡器（BWO）中出现的自发脉冲缩短现象。实验表明，这种现象伴随着在波纹慢波结构（SWS）表面形成爆炸发射等离子体。微波发射的终止是由于等离子体发射的电子对工作电磁波的吸收导致BWO起始电流增加，而由于等离子体发射的正离子的存在，吸收强度大幅增加。在X波段BWO中应用无油真空和对SWS表面进行电化学抛光，使得能够产生能量为J的3吉瓦、26纳秒微波脉冲，从而证明脉冲长度延长了四倍。
关键词—爆炸发射、吉瓦相对论返波振荡器（BWO）、脉冲延长、慢波结构、空间电荷中和、微波脉冲自发缩短、起始电流、表面处理、波吸收
Spontaneous pulse shortening occurring in a rel- ativistic backward wave oscillator (BWO) at gigawatt power levels is studied in experiment and theory. It is experimentally demonstrated that this phenomenon is accompanied by formation of an explosive-emission plasma at the surface of the corrugated slow-wave structure (SWS). Termination of microwave emission is explained by the increase of the BWO starting current from the absorption of the operating electromagnetic wave by electrons emitted from the plasma, whereas the intensity of the absorption radically increases owing to the presence of positive ions emitted from the plasma. Application of oil-free vacuum and electrochem- ical polishing of the SWS surface in an X-band BWO allowed generation of 3-GW, 26-ns microwave pulses with an energy of J, thereby demonstrating pulse lengthening by a factor of four. Index Terms—Explosive emission, gigawatt relativistic back- ward wave oscillator (BWO), pulse lengthening, slow-wave structure, space charge neutralization, spontaneous shortening of microwave pulse, starting current, surface conditioning, wave absorption.