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@InProceedings{mcgee:napac2019-weplm62,
author = {K.E. McGee and B.W. Barker and K. Elliott and A. Ganshyn and W. Hartung and M.P. Kelly and S.H. Kim and P.N. Ostroumov and J.T. Popielarski and T. Reid and A. Taylor and C. Zhang},
% author = {K.E. McGee and B.W. Barker and K. Elliott and A. Ganshyn and W. Hartung and M.P. Kelly and others},
% author = {K.E. McGee and others},
title = {{First Cold Test Results of a Medium-Beta 644 MHz Superconducting 5-Cell Elliptical Cavity for the FRIB Energy Upgrade}},
booktitle = {Proc. NAPAC'19},
pages = {731--734},
paper = {WEPLM62},
language = {english},
keywords = {cavity, target, pick-up, linac, accelerating-gradient},
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-WEPLM62},
url = {http://jacow.org/napac2019/papers/weplm62.pdf},
note = {https://doi.org/10.18429/JACoW-NAPAC2019-WEPLM62},
abstract = {The superconducting linac for the Facility for Rare Isotope Beams (FRIB) will accelerate ions to 200 MeV per nucleon, with the possibility of a future energy upgrade to 400 MeV per nucleon via additional cavities. A 5-cell superconducting β = 0.65 elliptical cavity was designed for this purpose. Two unjacketed 5-cell niobium cavities were fabricated; the first of these was Dewar tested in February 2019. The surface preparation was bulk electropolishing (EP, 150 µm), hydrogen degassing (600°C, 10 hours), light EP (20 µm), clean-room high-pressure water rinsing, and in-situ baking (120°C, 48 hours). We achieved Q₀ = 2·10¹⁰, equivalent to Rs = 10 nΩ, at the design gradient of 17.5 MV/m. The cavity was tested in a newly refurbished FRIB test Dewar, equipped with a variable input coupler.},
}