MONTE CARLO SIMULATION OF THE MULTIPACTOR ELECTRON DISCHARGE ON A DIELECTRIC SURFACE
This paper presents a Monte-Carlo model to investigate the single-surface multipactor discharge and its high-power absorption on a dielectric surface in the presence of the RF and de electric fields. By employing a novel method in the numerical implementation of the secondary electron emission, the susceptibility diagram is constructed; beam loading and its power absorption by the multipaetor discharge are examined; meanwhile the temporal evolution of the multipactor is also studied. The simulation results show clearly that (1) a steady state multipactor can be built up from a very low density initial electron distribution and an oscillatory steady state can be achieved when the positive charge, left by the emission of secondary electrons, is capable to build a large enough dc electric field; (2) during the saturation state, the normal electric field and the number of electrons in flight oscillate at twice the RF; (3) the average power absorbed by the multipactor, strongly depending on material parameters, is on the order of 1％incident power or less. Based on these results, the mechanism of RF window breakdown under high-power microwave conditions is suggested and several useful guidelines to prevent or extinguish the multipactor are presented.
Cheng Guo-xin Liu Lie Liu Yong-gui Yuan Cheng-wei
College of Optoelectric Science and Engineering,National University of Defense Technology,Changsha 410073,China
国际会议
17th International Conference on High-Power Particle Beams(第17届高功率离子束国际会议)
西安
英文
557-562
2008-07-06（万方平台首次上网日期，不代表论文的发表时间）