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新型二次电子倍增阴极构型设计与动力学过程

Configuration design and dynamic process study of novel multipacting cathode
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摘要 提出了一种可由脉冲功率驱动的新型二次电子倍增阴极构型,并对其进行了动力学过程的初步理论研究。首先,针对该二次电子倍增阴极,建立了动力学模型,获得了二次电子的位移和速度方程,讨论了电子初始出射速度对其轨迹、渡越时间和碰撞能量的影响,理论给出了渡越时间和碰撞能量的近似解析表达式。其次,通过动力学方程与Vaughan二次电子产额经验公式的耦合求解,获得了该二次电子倍增阴极的工作区间,并对其进行了细致讨论。结果表明:该新型二次电子倍增阴极二极管概念上是可行的,在涂敷高二次电子产额系数材料的圆柱形介质上施加合适的轴向和径向静电场(MV/m量级)以及轴向静磁场(T量级),可以达到电子沿阴极表面螺旋行进过程中实现二次电子倍增并最终获得电流沿轴向放大的设计目标。另外,讨论了正电荷沉积引发的二次电子倍增饱和现象,并对阴极发射电流密度进行了理论粗估,结果表明:阴极发射电流密度可达kA/cm2水平,具备强流发射特性;增加外加径向场强幅值可有效提升阴极发射电流密度。 In this paper,the configuration design of a novel multipacting cathode driven by pulsed power source is put forward and its dynamic process is theoretically inves tigated in detail.Firstly,the dynamic model is established for this novel multipacting cathode,the displacement and velocity expressions are obtained by solving the dynamic equation of secondary electrons.The influences of electron with different initial energy emitted from each direction on electron trajectory,velocity,and impact energy are discussed.The approximate expressions of electron transit time and impact energy are obtained and discussed theoretically.Secondly,to find the multipacting cathode working range,the multipacting susceptibility diagram is obtained and discussed in detail by solving electron dynamic equation coupling Vaughan’s empirical formula(secondary electron yield model).Theoretical results demonstrate that the conception of the novel multipacting cathode is feasible.By applying anappropriate electric field(aboutMV/m)in axial and radial directions and a proper magnetic field(T)in axial direction on a cylindrical dielectric surface coated by high secondary emission yield coefficient material,the electrons move with spiral trajectories along axial direction.Electron number could be increased effectively by each impact with multipacting interaction.This phenomenon could achieve electron current amplification until multipacting comes to saturation.Finally,the deposit phenomenon of positive charges and multipacting saturation are analyzed and discussed.The roughly theoretical estimation indicates that the novelmultipacting cathode has the performance of high emission current density,and the emission current density can run up to the level of kA/cm2.Enhancing the magnitude of applied electrostatic field in radial direction can effectively improve the emission current density.
作者 董烨 刘庆想 李相强 周海京 董志伟 Dong Ye;Liu Qingxiang;Li Xiangqian;Zhou Haijing;Dong Zhiwei(School of Physical Science and Technology,Southwest Jiaotong University,Chengdu 610031,China;Institute of Applied Physics and Computational Mathematics,Beijing 100094,China)
出处 《强激光与粒子束》 EI CAS CSCD 北大核心 2018年第3期22-30,共9页 High Power Laser and Particle Beams
基金 国家自然科学基金项目(11475155 11305015)
关键词 二次电子倍增阴极 二极管 动力学方程 二次电子倍增敏感区间 multipacting cathode diode dynami cequation multipacting susceptibility boundaries
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  • 1荀涛,杨汉武,张建德,赵延宋,罗铃.一种陶瓷径向绝缘强流二极管耐压结构设计[J].强激光与粒子束,2007,19(6):1019-1022. 被引量:3
  • 2[1]Smith I. Flashover of vacuum interfaces with many stages and large transit times[A]. Proc 5th IEEE International Pulsed Power Conference[C]. Arlington,Virginia, USA,1985.558-567.
  • 3[2]Smith I D, Corcoran P A. Design criteria for the Z vacuum insulator stack[A]. Proc 11th IEEE International Pulsed Power Conference[C]. Baltimore,Maryland, USA, 1997.168-176.
  • 4[3]Martin J C. Fast pulse vacuum flashover[R]. AWRE Note SSWA/JCM/713/157,1971.
  • 5[4]DiCapua M S. A statistical interpretation of the J. C. Martin relationship for breakdown of insulators in vacuum[A]. Proc 5th IEEE International Pulsed Power Conference[C]. Arlington,Virginia, USA, 1985.306-310.
  • 6[5]Stygar W A, Spielman R B. Operation of a five-stage 40,000-cm2-area insulator stack at 158kV/cm[A]. Proc 12th IEEE International Pulsed Power Conference[C]. Monterey,California, USA, 1999.454-457.
  • 7[6]Sullivan T S, Ashby S R. A cast-grandient-ring, racetrack-shaped, magnetic-flashover-inhibited insulator[A]. Proc 3th IEEE International Pulsed Power Conference[C]. Albuquerque,New Mexico, USA, 1981.252-255.
  • 8[1]Mako F M, Peter W. A high-current micro-pulse electron gun[A]. Proceeding of the 1993 Particle Accelerator Conference[C]. Washington DC: the American Physical Society, 1993, 4: 2702-2704.
  • 9[2]Nation J A, Schachter L, Mako F M, et al. Advances in cold cathode physics and technology[J]. Proceedings of the IEEE, 1999,87(5) :865-889.
  • 10[3]Len L K, Mako F M. Self-bunching electron guns[A]. Proceedings of the 1999 Particle Accelerator Conference[C] . New York: Brookhaven National Laboratory, 1999.70-74.

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