低能传输段空间电荷补偿效应（英文）

Review on Space Charge Compensation in Low Energy Beam Transportation

近些年来,随着基础科学和应用科学对强流加速器需求的日益增加,强流加速器得到了很大推广和发展.在强流加速器的低能段,空间电荷效应会导致束流发射度的增长,束流品质的变坏.这样的束流通常需要空间电荷补偿来控制空间电荷效应.空间电荷补偿是指束流可以通过吸收与束流电性相反的粒子从而减少束流空间电荷发散力的一种效应.北京大学自主开放了PIC-MCC空间电荷补偿模型,该模型被应用在H+和H-束流的空间电荷补偿模拟当中,且得到了与实验符合得比较好的结果.

Demands of high intensity accelerators are increasing for fundamental science research and engineering applications. In such kinds of accelerators, the beam in low energy parts is space charge dominated. This can result in large and irreversible emittance growth. Space charge compensation which occurs by tapping opposite polarity of the particle of the beam is a helpful way to overcome the effect caused by the space charge. An extended particle in cell （PIC） code jointed with the Monte Carlo collision （MCC） has been developed in Peking University （PKU） for modeling the space charge compensation. In the meantime, experiments of low energy H^＋ and H^- ion beam have been carried out. The results of the numerical simulation agree well with the experiment ones for both H^＋ beam and H^- beam. Details will be presented in this paper.