论文标题
实时六极调音在存储环处进行长时间的平面极化
Real-time sextupole tuning for a long in-plane polarization at storage rings
论文作者
论文摘要
长平面内束极化可能是存储环中自旋测量实验的所需特征。梁内的颗粒的自旋进液可以通过冷冻自旋方法和通过RF腔束进行控制，最终产生的极化寿命为10--100秒。先前的研究表明，六杆可以进一步改善它，这纠正了与光束的色彩相关的二阶效应。但是，六重奏可能需要调整环参数后。这项工作提出了一种依赖反馈算法的实时六重音调方法。它在存储过程中调节六极强度，以零平均径向自旋分量为目标。满足这种情况会导致更长的极化寿命。仿真研究表明，该方法中的大致确定反馈系数可在各种环参数中有效地工作，并考虑了实际场缺陷和测量误差。或者，该技术可用于在不干预测量的情况下在测试运行中优化六极强度。
A long in-plane beam polarization can be a desired feature for spin measurement experiments in storage rings. The spin precession of the particles within a beam can be controlled by means of the frozen spin method and beam bunching via RF cavities, eventually yielding a polarization lifetime of 10--100 seconds. Previous studies have shown that it can be further improved by sextupoles, which correct the second order effects related to the chromaticity of the beam. However, sextupoles can require readjustment after slight changes in ring parameters. This work presents a real-time sextupole tuning method that relies on a feedback algorithm. It adjusts the sextupole strength during storage, targeting a zero average radial spin component. Satisfying this condition results in a longer polarization lifetime. Simulation studies show that roughly determined feedback coefficients in this method work effectively for a wide range of ring parameters, with practical field imperfections and measurement errors taken into account. Alternatively, this technique can be used to optimize sextupole strengths in a test run without intervening the measurement.
