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@InProceedings{montironi:icalepcs2019-wepha099,
author = {M.A. Montironi and H. Bassan and M.A. Carrasco and E.M. Kraft and A. Marinelli},
title = {{XLEAP-II Motion Control}},
booktitle = {Proc. ICALEPCS'19},
pages = {1325--1328},
paper = {WEPHA099},
language = {english},
keywords = {controls, undulator, wiggler, feedback, electron},
venue = {New York, NY, USA},
series = {International Conference on Accelerator and Large Experimental Physics Control Systems},
number = {17},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {08},
year = {2020},
issn = {2226-0358},
isbn = {978-3-95450-209-7},
doi = {10.18429/JACoW-ICALEPCS2019-WEPHA099},
url = {https://jacow.org/icalepcs2019/papers/wepha099.pdf},
note = {https://doi.org/10.18429/JACoW-ICALEPCS2019-WEPHA099},
abstract = {The XLEAP project was conceived with the main scope of extending the generation of ultrashort pulses at LCLS to the sub-femtosecond (sub-fs) regime. As the project produced the expected results, an upgrade called XLEAP-II is being designed to provide the same functionality to LCLS-II. The XLEAP project utilized one variable gap wiggler to produce sub-fs X-ray pulses. The upgrade will involve four additional wigglers in the form of repurposed LCLS fixed gap undulators mounted on translation stages. This paper describes the design of the hardware and software architecture utilized in the motion control system of the wigglers. First it discusses how the variable gap wiggler was upgraded to be controlled by an Aerotech Ensemble motion controller through an EPICS Soft IOC (input-output controller). Then the motion control strategy for the additional four wigglers, also based around Aerotech controllers driving servomotors, is presented. Lessons learned from operating the wiggler and undulators during LCLS operation are discussed and utilized as a base upon which the upgraded motion control system is designed and built. Novel challenges are also identified and mitigations are discussed.},
}