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@inproceedings{vasserman:ipac2021-wepab127,
author = {I. Vasserman and R.J. Dejus and Y. Piao and M.F. Qian and J.Z. Xu},
title = {{Accurate Measurements of Undulator Particle Beam Entrance/Exit Angles Using Improved Hall Probes and Calibration Process}},
booktitle = {Proc. IPAC'21},
pages = {2907--2909},
eid = {WEPAB127},
language = {english},
keywords = {undulator, photon, insertion, insertion-device, closed-orbit},
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-WEPAB127},
url = {https://jacow.org/ipac2021/papers/wepab127.pdf},
note = {https://doi.org/10.18429/JACoW-IPAC2021-WEPAB127},
abstract = {{The Advanced Photon Source Upgrade (APS-U) undulator requirements were changed from the first and second field integrals to the entrance and exit angles of the particle beam. This provides the user with the best radiation view angle by the storage ring closed orbit correction system. To satisfy such requirements we use improved Senis Hall probes and calibration process. In addition to the normal NMR calibration of the sensors, the calibration was further refined using stretch-coil integrals to make accurate measurements.}},
}