论文标题
同时基于光束的比对测量
Simultaneous beam based alignment measurement for multiple magnets
论文作者
论文摘要
我们提出了一种同时确定传输线或存储环中多个四极杆的磁心中心的方法。该方法通过校正轨道梯度强度变化而纠正轨道校正器，从而找到磁铁中心。在两者之间选择轨道校正磁体和梁位置监测器，以确保可以实现四极位置的轨道校正。诱导轨道移位的校正是通过使用其矫正器的响应矩阵将轨道带向四极中心的轨道中心来完成的。可以测量或计算响应矩阵。使用Linac相干光源（LCLS）II和SPEAR3存储环的一部分的仿真来证明该方法的可行性和性能。它也在Spear3上进行了实验测试。该方法可以扩展用于基于光束的非线性磁体的对齐测量。
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.
