多个磁体的同时基于束流的对准测量
Simultaneous beam based alignment measurement for multiple magnets
摘要：
提出了一种同时确定传输线或储存环中多个四极子的磁中心的方法。该方法通过用轨道校正器校正由于四极梯度强度的改变而引起的轨道偏移来找到磁体中心。选择四极子时，轨道校正磁铁和束流位置监测器位于四极子之间，以确保可以实现四极子位置的轨道校正。诱导轨道偏移的校正是通过使用校正器将轨道转向四极中心来完成的，使用其相对于校正器的响应矩阵。响应矩阵可以测量或计算。对一段直线加速器相干光源（LCLS）II和SPEAR 3储存环进行了模拟，验证了该方法的可行性和性能。并在SPEAR3上进行了实验测试。该方法可推广应用于非线性磁体的束基准直测量。
英文摘要：
We propose a method to simultaneously determine the magnetic centers of multiple quadrupoles in a transport line or a storage ring. The method finds the magnet centers by correcting the orbit shift due to a change of the quadrupole gradient strengths with orbit correctors. The quadrupoles are selected with orbit corrector magnets and beam position monitors in between to ensure that orbit correction at the quadrupole locations can be achieved. The correction of the induced orbit shift is done by steering the orbit toward the quadrupole centers with correctors, using its response matrix with respect to the correctors. The response matrix can be measured or calculated. Simulations with a section of the Linac Coherent Light Source (LCLS) II and the SPEAR3 storage ring are done to demonstrate the feasibility and performance of the method. It is also experimentally tested on SPEAR3. The method can be extended for beam based alignment measurement of nonlinear magnets.
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