Electron Beam Acceleration Using Plasma Wakefield

等离子体尾流场加速至少需要两束电子。第一束（驱动束）激发等离子体中的等离子体波，第二束（测试束）被波的势加速。核工程研究实验室。东京大学有一对直线发电机，每一个都可以被分配为驱动束发电机和测试束发电机。1992年，在等离子体室建造了两条直线光束合并的传输线路。1993年观察到由驱动串引起的测试串的加速度。特别是在等离子体密度低于光束密度的低密度等离子体中，观察到非线性异常加速度。1994年，观测到的加速度是等离子体密度的函数，范围超过两个数量级。观察到等离子体透镜效应对驱动束的聚焦，使尾流场增大，超出了基于刚性模型计算的预测。观测到的最大加速度梯度约为1MeV/m。在1995年，我们将使用一系列驱动串来建造尾流场。

Plasma wakefield acceleration uses at least two bunches of electrons. The first bunch (drive bunch) excites plasma waves in a plasma, and the second one (test bunch) is accelerated by the potential of the wave. Nuclear Engineering Research Lab., the University of Tokyo has twin linacs, each of which can be assigned as a drive bunch generator and a test bunch generator.In 1992 transport lines were constructed which merges two linac beams at the plasma chamber. In 1993 Acceleration of the test bunches caused by the drive bunches was observed. Especially nonlinear anomalous acceleration was observed in an inderdense plasma in which the plasma density is lower than the beam density. In 1994, the acceleration was observed as a function of plasma density ranged in more than two orders of magnitude. The focusing of the drive bunches by the plasma lens effect was observed which increases the wakefields more than the prediction of the calculation based on the rigid model.The maximum acceleration gradient observed was around 1MeV/m. In 1995 we are going to build up wakefields using a train of drive bunches.