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

在本研究中，应用于微型自由电子激光器的是高电流密度微电子束，这是为真空微电子学（VME）而发展起来的。将大电流微电子束流注入中等尺度介质波导中，产生切伦科夫辐射并启动自由电子激光器振荡。用于VME的微电子束是由一个称为“场发射阵列”的微发射器产生的。当电子束直径最小，电流大于几百μ a时，切伦科夫微型自由电子激光器进入振荡阶段。在模拟中，我们使用了内径为2- 4um，长度为2mm的介质光波导。在100muA时，振荡在200psec内达到饱和阶段。作为一种典型的有限元装置，我们选择了Spindt阴极，并通过开发的计算机模拟程序研究了发射过程和光束传播。并进行了针阴极的初步实验。

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.