论文标题
THZ偏转器使用介电衬里的波导进行超短束测量的GEV量表
THz deflector using dielectric-lined waveguide for ultra-short bunch measurement in GeV scale
论文作者
论文摘要
我们建议使用介电衬里的圆形波导（DLW）结构在THZ状态下提出一个RF偏转器，以在GEV尺度上测量超短电子束的束长度。我们以合理的输入脉冲能量的THZ来显示偏转器的设计和可能的分辨率。我们使用基于本本摩德计算的分析模型研究了DLW中的短距离Wakefield效应，并根据梁大小（束长度）显示了缩放定律。我们发现，偏转器的理想分辨率可以达到$ {\ cal o}（100）〜[{\ rm as}] $，具有几个$ {\ rm mj} $的脉冲能量，具有微不足道的韦克菲尔德效果。给出了示例计算，其真空孔半径为$ 0.5，\ 0.4，\ 0.3〜 [{\ rm mm}] $，介电常数$ 3.75 $，工作频率为$ 0.2，\ 0.4，\ 0.6〜 [{\ rm thz}] $。
We propose an RF deflector in the THz regime to measure the bunch length of the ultrashort electron beam in GeV scale by using the dielectric-lined circular waveguide (DLW) structure. We show the design of the deflector and the possible resolution in the attosecond scale with a reasonable input pulse energy of THz. We investigate the short-range wakefield effect in the DLW to the time resolution using the analytical model based on the eigenmode calculation and show the scaling law in terms of the beam size, the bunch length. We found the ideal resolution of the deflector can reach order ${\cal O}(100)~[{\rm as}]$ with pulse energy of several ${\rm mJ}$ with a negligible wakefield effect. Example calculations are given for a structure with the vacuum hole radius of $0.5,\ 0.4,\ 0.3~[{\rm mm}]$, the dielectric constant of $3.75$, the operating frequency of $0.2,\ 0.4,\ 0.6~[{\rm THz}]$, respectively.
