时间拉伸漂移管模拟技术  

Simulation on time dilation drift tube

作　　者：孙江 翁秀峰 蔡丹 张金海 胡杨 张鹏飞 彭士香[1] SUN Jiang;WENG Xiufeng;CAI Dan;ZHANG Jinhai;HU Yang;ZHANG Pengfei;PENG Shixiang(Institute of Heavy Ion Physics,School of Physics,Peking University,Beijing 100871,China;State Key Laboratory of Intense Pulsed Radiation Simulation and Effect,Xi’an Shaanxi 710024)

机构地区：[1]北京大学物理学院重离子物理研究所,北京100871 [2]强脉冲辐射环境模拟与效应国家重点实验室,陕西西安710024

出　　处：《太赫兹科学与电子信息学报》2021年第3期448-452,共5页Journal of Terahertz Science and Electronic Information Technology

基　　金：国家自然科学基金资助项目(11505142,11705150,11875224)。

摘　　要：通过粒子模拟(PIC)的方法研究了可用于全高半宽度10 ps量级快脉冲光信号脉宽测量的时间拉伸漂移管。分别模拟了光阴极半径、加速管长度、加速电压、漂移区长度、螺线管中心磁场强度、初始光电子能量和初始光电流对时间拉伸漂移管展宽系数的影响。分析了时间拉伸漂移管展宽系数的主要影响因素,同时给出了漂移管展宽系数对初始电子能量和初始光电流的线性关系,证明了所设计的时间拉伸漂移管能够满足逆康普顿散射源的束长测量。研究结果可为逆康普顿散射源电子束长测量提供技术手段。A time dilation drift tube is simulated by Particle-In-Cell(PIC)model,which can be used for measuring pulsed signal at least 10 ps for Full Width at Half Maximum(FWHM).The factors influencing the coefficient of spread are calculated including radius of photocathode,length of acceleration tube,acceleration voltage,length of drift tube,center magnetic field of solenoid,energy and current of photo electrons.Results show that a linear characteristic exists between the coefficient of spread and the energy and current of photo electrons,which means signal of time dilation drift tube is independent of initial pulsed electrons energy distribution and current waveform.The proposed time dilation drift tube offers a way to diagnose beam length parameter of inverse Compton scattering source instead of streak camera.

关 键 词：时间拉伸漂移管 逆康普顿散射源 粒子模拟 束长度 展宽系数 

分 类 号：TL506[核科学技术—核技术及应用] O441.5[理学—电磁学]