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@InProceedings{lynam:napac2019-tuplh10,
author = {S.M. Lynam and R.B. Agustsson and I.I. Gadjev and F.H. O'Shea and A.Yu. Smirnov},
title = {{Fabrication Progress of a Superconducting Helical Undulator with Superimposed Focusing Gradient for High Efficiency Tapered X-Ray FELs}},
booktitle = {Proc. NAPAC'19},
pages = {509--511},
paper = {TUPLH10},
language = {english},
keywords = {undulator, FEL, quadrupole, vacuum, focusing},
venue = {Lansing, MI, USA},
series = {North American Particle Accelerator Conference},
number = {4},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {10},
year = {2019},
issn = {2673-7000},
isbn = {978-3-95450-223-3},
doi = {10.18429/JACoW-NAPAC2019-TUPLH10},
url = {http://jacow.org/napac2019/papers/tuplh10.pdf},
note = {https://doi.org/10.18429/JACoW-NAPAC2019-TUPLH10},
abstract = {The Advanced Gradient Undulator (AGU) represents a potentially significant advancement in x-ray conversion efficiency for x-ray FELs. This increase in efficiency would have broad implications on the capabilities of x-ray light sources. To achieve this high conversion efficiency, the inner diameter of the undulator coil is a mere 7mm, even with the use of superconducting coils. To accommodate the beamline at the Advanced Photon Source this yields in a chamber with a wall thickness of 0.5mm fabricated from Aluminum. With a period of 2cm and a conductor position tolerance of <100 µm over a length of >80cm at 4.2K, the engineering and fabrication challenges for the undulator alone are substantial. We will discuss these fabrication challenges and present solutions to meet the tolerances required for desired performance, and provide an update on current progress of the construction of a section of the AGU insertion device.},
}