APS存储环中六极轨道偏移量的测量

M. Borland, E. Crosbie, N. Sereno
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引用次数: 1

摘要

先进光子源(APS)存储环中六极的水平轨道误差会引起环周围β函数的调谐和调制变化。要确定这些效应的重要性,需要知道相对于六极磁心的轨道。这里考虑的确定在给定六极中水平梁位置的方法是测量由六极强度变化引起的调谐位移。同一平面的调谐位移和beta函数唯一地确定了六极中的水平波束位置。通过将附近四极测得的beta函数传播到六极位置来确定六极处的beta函数。该方法用于测量六极体相对于相邻波束位置监测仪(BPM)在多个六极体位置的磁中心偏移。我们报告了该方法的成功和问题,以及一种替代方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Measurement of sextupole orbit offsets in the APS storage ring
Horizontal orbit errors at the sextupoles in the Advanced Photon Source (APS) storage ring can cause changes in tune and modulation of the beta functions around the ring. To determine the significance of these effects requires knowing the orbit relative to the magnetic center of the sextupoles. The method considered here to determine the horizontal beam position in a given sextupole is to measure the tune shift caused by a change in the sextupole strength. The tune shift and a beta function for the same plane uniquely determine the horizontal beam position in the sextupole. The beta function at the sextupole was determined by propagating the beta functions measured at nearby quadrupoles to the sextupole location. This method was used to measure the sextupole magnetic center offset relative to an adjacent beam position monitor (BPM) at a number of sextupole locations. We report on the successes and problems of the method as well as an alternate method.
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