Research on Micro FEL driven by a Micro Electron Beam from a Spindt Cathode

在这项研究中，应用于微型自由电子激光器的是为真空微电子(VME)研制的高电流密度微电子束。为了产生切伦科夫辐射并启动自由电子激光振荡，将大电流微电子束注入到大尺寸介质波导中。用于VME的微电子束是由一种称为“场发射阵列”的微发射极产生的。计算机模拟表明，当电子束直径为1微米，电流大于几百微米微束时，切伦科夫微自由电子激光器将进入振荡阶段。在模拟中，我们使用了内径为2-4微米、长度为2毫米的介质光导。作为一种典型的有限元分析器件，我们选择了Spindt阴极，用开发的计算机模拟程序研究了发射过程和束流传输过程。本文还给出了针状阴极的初步实验结果。

In this research, applied to a micro FEL is a high current density micro electron beam which has been developed for the vacuum micro electronics (VME). The high current micro electron beam is injected into a mum-scale dielectric wave guide in order to generate the cherenkov radiation and start the FEL oscillation. The micro electron beam used for VME is generated by using a micro emitter which is called 'field emission array'.When the electron beam diameter is lmum and the current is higher than a few hundreds of muA,the computer simulations indicate that the cherenkov micro FEL will reach the oscillation stage. In the simulation, we used a dielectric optical guide whose inner diameter and length are 2-4mum and 2mm respectively. The oscillation reaches the saturation stage within 200psec for 100muA.As a typical FEA device, we chose the Spindt Cathode and investigate the emission process and the beam propagation by a developed computer simulation code. A preliminary experiments with a needle cathode has been also demonstrated.