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针对合肥光源二期改造工程设计了一条带束流位置检测器(BPM),用于储存环中束流参数在线测量。对条带BPM进行了位置信号的离线标定,采用差比和法和对数比法进行计算,获得了灵敏度系数、映射图和拟合经验多项式,发现采用对数比法得到的灵敏度大小和线性范围好于差比和法。对和信号进行离线标定,发现和信号相对中心位置处的归一化值在(-5mm,-5mm)到(5mm,5mm)范围内变化不超过±6%。该条带BPM也用来测量合肥光源储存环上束团横向四极振荡,所以需对横向四极分量进行标定。采用二维网格结构高斯加权法模拟高斯束团,使用差比和法进行计算,并将测量结果与模拟结果比较,发现横向四极分量随(σx2-σy2)线性变化的灵敏度与模拟结果相同,均为0.001 1mm-2。得到的拟合经验公式用于在线测量。
A beam position detector (BPM) was designed for the second phase of Hefei Light Source Project to measure the beam parameters online in the storage ring. The strip BPM was calibrated offline by using the difference ratio method and the logarithmic ratio method. The sensitivity coefficient, the mapping and the fitting experience polynomial were obtained. The sensitivity and logarithm of the logarithmic ratio method were obtained. The range is better than the difference and the law. Offset calibration of the sum signal showed that the normalized value at the relative center of the signal did not vary by more than ± 6% from (-5mm, -5mm) to (5mm, 5mm). The strip BPM is also used to measure the transverse quadrupole oscillations of the cluster in the Hefei light source storage ring, so the quadrupole components of the transverse direction need to be calibrated. The Gaussian beam method was used to simulate the Gaussian beam with a two-dimensional grid structure. The difference method was used to calculate the Gaussian beam. The measured results were compared with the simulation results. The sensitivity of the linear quadrupole component with (σx2-σy2) linearity was the same as the simulation result , Both 0.001 1mm-2. The resulting empirical formula is used for online measurement.