CSRm束流径向和轴向振荡的耦合
Particles coupling between horizontal and vertical oscillations in CSRm
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摘要: 介绍了由于磁铁的安装误差和螺线管的存在而造成的束流径向和轴向的耦合，以及耦合对束流稳定的影响。结合CSRm结构的典型参数分析得出：二极磁铁和四极磁铁在纵向角安装偏差为-0.5~0.5 mrad；有螺线管存在的情况下，工作点落在和共振线时，将导致束流不稳定而大量损失，落在差共振线时，束流稳定。通过模拟计算发现：螺线管产生的耦合远大于磁铁的纵向角安装偏差产生的耦合。Abstract: Particles coupling might lead to the loss of particles in some condition. This paper described that the rotation of the main magnets and the existence of the solenoid were the reasons of the particles coupling between horizontal and vertical oscillations and that the particles would be unstable when working at sum resonance and the existence of the solenoid contributed more to the particles coupling than the rotation of the main magnets. Using the typical parameters of HIRFL-CSRm system, the particles would be stable when CSRm worked at given working point which was nearly difference resonance.
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Key words:
- coupling /
- difference resonance /
- sum resonance /
- transformation matrix
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