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@inproceedings{piao:ipac2021-thpab077,
author = {Y. Piao and R.J. Dejus and M.F. Qian and I. Vasserman and J.Z. Xu},
title = {{Magnetic Shims Studies for APS-U Hybrid Permanent Magnet Undulators}},
booktitle = {Proc. IPAC'21},
pages = {3941--3944},
eid = {THPAB077},
language = {english},
keywords = {undulator, multipole, simulation, GUI, quadrupole},
venue = {Campinas, SP, Brazil},
series = {International Particle Accelerator Conference},
number = {12},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {08},
year = {2021},
issn = {2673-5490},
isbn = {978-3-95450-214-1},
doi = {10.18429/JACoW-IPAC2021-THPAB077},
url = {https://jacow.org/ipac2021/papers/thpab077.pdf},
note = {https://doi.org/10.18429/JACoW-IPAC2021-THPAB077},
abstract = {{For the newly designed and fabricated APS Upgrade (APS-U) hybrid permanent magnet undulators (HPMUs), the development of magnetic shims has been critical to successfully tuning the undulators to meet the tight APS-U physics requirements. Different types of side and surface shims have been developed and applied for this purpose. The side shims are primarily used for trajectory tuning, and the surface shims are for phase and multipole tuning as well as trajectory tuning. Current design, applications, and measurement of the shims for the newly designed and fabricated APS28 (28 mm period) undulators are presented in this paper.}},
}