Linear and second order optics corrections for the KEK Accelerator Test Facility final focus beam line
Linear and second order optics corrections for the KEK Accelerator Test Facility final focus beam line
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KEK 加速器测试设施最终聚焦光束线的线性和二阶光学校正
DOI：
10.1103/physrevstab.17.023501
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
and M. Woodley
中科院分区：
文献类型：
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作者：
T. Okugi;S. Araki;P. Bambade;K. Kubo;S. Kurado;M. Masuzawa;E. Marin;T. Naito;T. Tauchi;N. Terunuma;R. Tomas;J. Urakawa;G. White;and M. Woodley
本文介绍了KEK加速器试验装置（ATF2）最终聚焦光束线的线性和二阶光学校正。ATF2光束线的光束光学设计基于类似于ILC最终聚焦系统的局部色度校正方案。2012年的波束测量显示，倾斜的六极磁场误差比磁场测量预期的要大得多。倾斜六极场误差是限制ATF2虚拟相互作用点波束尺寸的一个关键因素。因此，2012年8月，安装了4个倾斜六极磁铁来纠正磁场误差。通过使用4个倾斜六极磁体，提高了ATF2磁体倾斜六极场误差的预测容限。此外，通过对六极磁体磁场图的分析，确定了六极偏斜磁场误差的来源。去除场误差源后，IP垂直光束尺寸更容易聚焦到65 nm以下。
In this paper, the linear and second order optics corrections for the KEK Accelerator Test Facility (ATF2) final focus beam line are described. The beam optics of the ATF2 beam line is designed based on a local chromaticity correction scheme similar to the ILC final focus system. Beam measurements in 2012 revealed skew sextupole field errors that were much larger than expected from magnetic field measurements. The skew sextupole field error was a critical limitation of the beam size at the ATF2 virtual interaction point (IP). Therefore, four skew sextupole magnets were installed to correct the field error in August 2012. By using the four skew sextupole magnets, the predicted tolerances of the skew sextupole field errors of the ATF2 magnets were increased. Furthermore, analyzing field maps of the sextupole magnets identified the source of the skew sextupole field error. After the field error source was removed, the IP vertical beam size could more easily be focused to less than 65 nm.