在考虑束团内粒子之间的空间电荷相互作用力的条件下,对日本理化研究所(RIKEN)现有的一台注入器(加速常数为K70的AVF型回旋加速器)中束团的演变过程进行了模拟计算。模拟结果表明,束团的形变、束晕现象同样发生在回旋加速器中,不过,其产生机制不同于直线加速器。它不是由共振和混沌引起,而是由于粒子的排斥运动和束团内粒子的涡流运动引起的。 Considering the space charge interactions between the particles in the bundle, the evolution of bunches in an existing infuser of Japan RIKEN (AVF cyclotron with an acceleration constant of K70) A simulation was performed. The simulation results show that the deformation and beam halo of bunches also occur in the cyclotron, however, the mechanism is different from the linear accelerator. It is not caused by resonance and chaos, but due to the particle’s repulsive motion and the swirling motion of the particles within the bundle.