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为了测量和校正线性光学参数,在上海光源储存环调束过程当中使用了基于响应矩阵的线性光学参数分析(LO-CO)的方法。介绍了应用LOCO进行计算和校正的过程,包括:数值模拟得到束流位置探测器的测量精度对拟合结果的影响,调整四极铁电源电流强度来校正工作点和beta函数周期性的恢复。测量结果表明,在四极铁强度调整幅度在1.5%以内的情况下,储存环的束流光学参数成功地恢复到和设计值相当接近的状态,beta函数和色散函数畸变小于1%。通过束流光学参数的校正,使得在今后的工作当中可以轻松地控制储存环的工作模式。
In order to measure and correct the linear optical parameters, a method based on response matrix linear optical parametric analysis (LO-CO) was used in the process of beam conditioning in Shanghai Light Source. The process of applying LOCO for calculation and correction is introduced. The simulation results show that the measuring accuracy of the beam position detector can influence the fitting result, and the power intensity of the quadrupole can be adjusted to correct the periodic recovery of the operating point and the beta function. The measurement results show that the beam optical parameters of the storage ring are restored to the values close to the design values with the quadrupole strength adjustment within 1.5%. The beta function and the dispersion function distortion are less than 1%. By correcting the beam optical parameters, it is possible to easily control the working mode of the storage ring in future work.