Space charge limits in proton synchrotrons
Space charge limits in proton synchrotrons
复制标题
质子同步加速器中的空间电荷限制
DOI：
10.1016/0168-9002(89)91472-1
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
G. Parzen
中科院分区：
文献类型：
--
作者：
G. Parzen
为研究空间电荷的影响和计算圆形加速器的空间电荷极限，编写了一个仿真程序。该程序通过加速器晶格的元素跟踪粒子，将空间电荷力表示为每个元素出口和入口的踢。模拟研究结果表明，本征空间电荷极限在决定空间电荷极限方面起主导作用。本征空间电荷极限是在没有磁场误差的情况下的空间电荷极限，是由束流本身产生的力所引起的极限。内在极限似乎为空间电荷极限提供了一个上限，这与三个运行加速器实际实现的上限相差不远。只有当束流强度接近本征极限时，由磁场误差引起的共振才会变得重要，并可能阻碍加速器达到本征极限。仿真研究结果与现有三种加速器的实测结果进行了比较。并给出了所提出的AGS助推器的实验结果。
A simulation program has been written to study the effects of space charge and to compute the space charge limit in circular accelerators. This program tracks particles through the elements of the accelerator lattice, representing the space charge force as a kick at the exit and entrance of each element. The results of the simulation study indicate that the intrinsic space charge limit appears to play a dominant role in determining the space charge limit. The intrinsic space charge limit is the space charge limit in the absence of magnetic field errors, and is the limit due to forces generated by the beam itself. The intrinsic limit appears to provide an upper bound for the space charge limit which is not far from what is actually achieved by three operating accelerators. The presence of resonances due to magnetic field errors becomes important only when the beam intensity gets close to the intrinsic limit, and can prevent the accelerator from achieving the intrinsic limit. The results of the simulation study are compared with measured results for three existing accelerators. Results are also given for the proposed AGS booster.