束束效应是限制对撞机性能提高的重要因素,其限制作用可以通过补偿机制来改善.针对正对撞束束效应,提出两种实现束束补偿的对撞机结构,并对实现束束补偿的原理和需要满足的条件进行分析.提出利用能量回收型直线加速器产生的电子束流进行正对撞束束补偿的方案,并且基于超级质子质子对撞机进行模拟研究,研究了补偿前后束流粒子分布、频移和粒子损失等变化情况.束束补偿可以减小束团内部粒子的频散,减小束流损失,提高束流寿命,可以大幅提高单束团流强,从而提高对撞机亮度.

Beam-beam effect is a main factor limiting the performance of colliders.The limitation may be alleviated by compensation techniques.We proposed two types of head-on beam-beam compensation schemes with four beams and analyzed the principle of these schemes in theory.We investigated the effects of head-on beam-beam compensation with an Energy Recovery Linac (ERL) on the proton beam dynamics in SPPC.The beam distribution,tune footprint and beam loss rate are analyzed.From the simulation result,we found that head-on beam-beam compensation can reduce the tune footprint of each bunch and improve the beam lifetime effectively.Therefore bunch current and consequently the luminosity will increase very much with the beam-beam compensation.