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为了提高并且采用双束加速技术以进一步提高BEPCII正电子从直线加速器注入到储存环的速率,BEPCII(Bei-jing Electron Positron Collider Upgrade Project)正在建造带有两个次谐波聚束腔的新预注入器。提出了使用光阴极注入器作为BEPCII预注入器的新方案,其性能优于次谐波聚束系统:发射度和能散至多为次谐波聚束系统的1/4,100%的传输效率,没有卫星束团的干扰,等。此外,还分别对光阴极注入器在高电荷量和低电荷量两种情况下的束流动力学进行了模拟计算和优化研究,并将其性能与正在建造的次谐波聚束系统和旧聚束系统的性能进行了比较和讨论。由此光阴极注入器产生的电子束还可以在将来用作激光-等离子体或激光-非传导性加速结构的尾场加速研究。
In order to enhance and employ a two-beam acceleration technique to further increase the rate of BEPCII positron injection from the linear accelerator to the storage ring, the BEPCII (Bei-jing Electron Positron Collider Upgrade Project) is building a new pre-amplifier with two sub- Injector. A new scheme using a photo-cathode injector as a BEPCII pre-injector is proposed, which outperforms the subharmonic beam-forming system by a transmission efficiency of 1/4 and 100% Satellite Bunch interference, and so on. In addition, the beam-flow dynamics of the photo-cathode injector under both high charge and low charge were simulated and optimized respectively. The performance of the proposed model was compared with that of the subharmonic beam-forming system under construction and the old poly Beam system performance were compared and discussed. The electron beam generated by this photocathode can also be used in the future as a tail field acceleration study of laser-plasma or laser-non-conductive accelerating structures.