关键词: 高功率微波/
大气击穿/
种子电子/
蒙特卡罗
English Abstract
Seed electron production from O- detachment in high power microwave air breakdown
Wei Jin-Jin,Zhou Dong-Fang,
Yu Dao-Jie,
Hu Tao,
Hou De-Ting,
Zhang De-Wei,
Lei Xue,
Hu Jun-Jie
1.College of Communication System Engineering, The PLA Information Engineering University, Zhengzhou 450001, China
Fund Project:Project supported by the National Natural Science Foundation of China (Grant Nos. 61201056, 61271104).Received Date:02 July 2015
Accepted Date:23 December 2015
Published Online:05 March 2016
Abstract:The existence of seed electrons is the precondition of air breakdown induced by high power microwave (HPM). Seed electrons are usually assumed to exist in background atmosphere when simulating the air breakdown triggered by HPM. However, this assumption may lead to some large errors especially in lower atmosphere where the number of electrons is very small. We establish a physical model of seed electron production from O- detachment collision with air molecules using the Monte Carlo method. A three-dimensional Monte Carlo program is developed to simulate this process. The average energies of O- and the average generation time of seed electrons under different electric intensities, frequencies, air pressures and breakdown volumes are obtained through simulation. The simulations show that the average generation time of seed electrons becomes longer with the increase of air pressure or the HPM frequency. The average seed electron generation time becomes shorter with the increase of electric intensity or breakdown volume. Finally, we simulate the processes of O- detachment collision with air molecules under the same experimental conditions. The comparative results show that the seed electron generation from O- detachment can explain the experimental results when the HPM frequency is low, while at higher frequencies, the average seed electron generation time becomes so long that it cannot correspond to the experimental value. Therefore some other mechanisms should be considered in the higher frequency case.
Keywords: high power microwave/
air breakdown/
seed electron/
Monte Carlo
