@article{681b6cc5d68d41059c0e7900bc345088,
title = "Performance-defining properties of Nb3Sn coating in SRF cavities",
abstract = "Nb3Sn has potential to become the material of choice for fabrication of SRF cavities. The higher critical temperature of Nb3Sn potentially allows for an increased operational temperature in SRF cavities, which could enable a simplification of the cryogenic system, leading to significant cost reduction. We present extended characterization of a Nb3Sn coated Nb cavity prepared at Cornell University. Using a combination of thermometry during cavity RF measurements, and structural and analytical characterization of the cavity cutouts, we discovered Nb3Sn coating flaws in regions that exhibit significant heating during the RF testing. Results of extended comparison of cavity cutouts with different dissipation profiles not only indicate the cause of significant Q degradation but also establish figures of merit for material qualities in relation to the quality of SRF performance.",
keywords = "NbSn, SRF materials, films, microscopy",
author = "Y. Trenikhina and S. Posen and A. Romanenko and Sardela, {Mauro R} and Zuo, {J. M.} and Hall, {D. L.} and M. Liepe",
note = "Funding Information: This work was carried out in part in the Frederick Seitz Material Research Laboratory Central Research Facilities, University of Illinois. The authors would like to thank all the staff scientists who work at Center for Microanalysis of Materials in Frederick Seitz Material Research Laboratory. This work made use of the EPIC, Keck-II, and/or SPID facility(ies) of Northwestern Universitys NUANCE Center, which has received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-1542205); the MRSEC program (NSF DMR-1121262) at the Materials Research Center; the International Institute for Nanotechnology (IIN); the Keck Foundation; and the State of Illinois, through the IIN. Funding Information: Work performed at Cornell was primarily supported by US DOE award DE-SC0008431, and in part by the US National Science Foundation under Award PHY-1549132, the Center for Bright Beams. Select results presented in this work made use of the Cornell Center for Materials Research Shared Facilities which are supported through the NSF MRSEC program (DMR-1120296). Publisher Copyright: {\textcopyright} 2017 IOP Publishing Ltd.",
year = "2018",
month = jan,
doi = "10.1088/1361-6668/aa9694",
language = "English (US)",
volume = "31",
journal = "Superconductor Science and Technology",
issn = "0953-2048",
publisher = "IOP Publishing Ltd.",
number = "1",
}