切伦科夫辐射的强流电子束均匀性光学诊断  

Optical diagnosis system based on Cerenkov radiation for the uniformity of intense electron beam diode

作　　者：蔡丹[1] 刘列[1] 巨金川[1] 王潇[2] 

机构地区：[1]国防科技大学光电科学与工程学院 [2]中国人民解放军78010部队

出　　处：《国防科技大学学报》2015年第2期14-18,共5页Journal of National University of Defense Technology

基　　金：国家自然科学基金资助项目(11305263;61401484)

摘　　要：透明介质中带电粒子的运动速度大于介质中的光速时就会产生切伦科夫辐射光。搭建了基于切伦科夫辐射光的强流电子束均匀性诊断系统,实现了时间和空间分辨的纳秒级电子束均匀性光学诊断。利用程序对诊断系统进行设计。在此基础上对两种天鹅绒阴极发射均匀性进行光学诊断测量。结果表明:在相同电参数下,碳纤维天鹅绒较化纤天鹅绒具有更好的发射性能,与之对应的切伦科夫辐射光斑面积更大,其亮度扫描曲线不但中心增强区域较化纤天鹅绒宽,在其边缘附近也有较强的亮度分布;通过分析切伦科夫辐射光斑的分布和强弱的时间分辨图像,可以得到阴极在电脉冲过程中的运行状态,具有10ns^100ns级时间分辨特性。Electrons traversing a transparent medium emit Cerenkov light when the electron velocity exceeds the velocity of light in the medium. A time-and-space resolved optical diagnosis system based on Cerenkov radiation for the uniformity of intense electron beam diode has been founded. Before the operation of a series experiments, Particle-in-cell and Monte Carlo simulation codes were utilized to design the experiment structure. The emission uniformity of two kinds of velvet sample was studied. It was found that the carbon velvet cathode hasmuch bigger central enhancement zone and the Cerenkov radiation light of the area near the edge is also brighter. The operating state of diode can be obtained by analyzing the time evolutions of Cerenkov radiation light which achieves 10ns ~ lOOns temporal resolution.

关 键 词：强流电子束 时间分辨均匀性诊断 高速分幅相机 

分 类 号：TL65[核科学技术—核技术及应用] TN248[电子电信—物理电子学]