基于直线感应加速器的非相干太赫兹源设计

太赫兹波的产生途径有很多，本文通过理论设计和数值计算模拟了利用强流直线感应加速器神龙一号来产生 THz波。神龙一号直线感应加速器能够产生最大能量~20 MeV、束流强度~2 kA、脉冲宽度~60 ns 的脉冲电子束，脉冲电子束以不同能量通过偏转半径不相同的偏转磁铁后可以辐射出具有连续频率的太赫兹波。模拟计算了不同能量下的电子束通过偏转半径分别为0.2 m、0.5 m和1 m的偏转磁铁后得到的太赫兹波频率与电子束能量、磁铁偏转半径等的关系，太赫兹波的频率范围可达0.1 THz~9 THz，最大瞬时辐射功率~0.5 W。最后根据神龙一号直线感应加速器漂移段布局，设计得到偏转半径为0.5 m的偏转磁铁结构以及模拟结果。

Design of incoherent THz source based on linear induction accelerator

There are many methods to generate THz wave. The high current linear induction accelerator Dragon-I is used to produce THz wave by applying the theory design and numerical simulation. The Dragon-I linear induction accelerator can produce intense electron beam with current about 2 kA, maximum energy about 20 MeV and pulse width about 60 ns. The intense electron beams which pass through deflection magnet with different radii can synchronously radiate continuous electromagnetic wave in THz frequency. Using the numerical simulation, the electron beams deflected by the magnets with different radii are calculated, and the relation curves among terahertz wave frequency, electron beam energy and radius of deflection are obtained. The frequency range of THz wave can be up to 0.1 THz-9 THz, and the maximum radiated power can achieve 0.5 W. According to the layout of linear induction accelerator, deflection magnet with 0.5 m radius is simulated and designed lastly.