通过PEP-II、DA/spl、Phi/NE、ALS和SPEAR的数字反馈系统进行多束不稳定性诊断

J. Fox, R. Larsen, S. Prabhakar, D. Teytelman, A. Young, A. Drago, M. Serio, W. Barry, G. Stover
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引用次数: 7

摘要

基于通用可编程DSP架构的纵向反馈系统已经在4个实验室进行了调试。除了纵向反馈和光束诊断外,这些灵活的系统还被编程为提供横向运动诊断。诊断功能基于瞬态域技术,记录反馈系统操纵光束时每个束的响应。通过PEP-II, DA/spl Phi/NE, ALS和SPEAR的实验结果说明了4个装置的操作经验。通过短(20 ms)瞬态激励,测量了不稳定和稳定耦合束模态的横向和纵向模态增长和阻尼率。来自稳态测量的数据用于识别不稳定模式、噪声驱动的光束运动和噪声源。说明了可以从稳定光束的低电流测量中预测不稳定阈值的技术。提出了测量束列不稳定性随时间演变的横向束列生长-阻尼序列,并与离子和快离子不稳定性所期望的特征进行了比较。
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Multi-bunch instability diagnostics via digital feedback systems at PEP-II, DA/spl Phi/NE, ALS and SPEAR
Longitudinal feedback systems based on a common programmable DSP architecture have been commissioned at 4 laboratories. In addition to longitudinal feedback and beam diagnostics these flexible systems have been programmed to provide diagnostics for transverse motion. The diagnostic functions are based on transient domain techniques which record the response of every bunch while the feedback system manipulates the beam. Operational experience from 4 installations is illustrated via experimental results from PEP-II, DA/spl Phi/NE, ALS and SPEAR. Modal growth and damping rates for transverse and longitudinal planes are measured via short (20 ms) transient excitations for unstable and stable coupled-bunch modes. Data from steady-state measurements are used to identify unstable modes, noise-driven beam motion, and noise sources. Techniques are illustrated which allow the prediction of instability thresholds from low-current measurements of stable beams. Transverse bunch train grow-damp sequences which measure the time evolution of instabilities along the bunch train are presented and compared to signatures expected from ion and fast ion instabilities.
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