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TY - CPAPER AU - Hall, D.L. AU - Clasby, B. AU - Conklin, H. AU - Eichhorn, R.G. AU - Gruber, T. AU - Hoffstaetter, G.H. AU - Kaufman, J.J. AU - Liepe, M. TI - High Quality Factor Studies in SRF Nb3Sn Cavities J2 - Proc. of International Conference on RF Superconductivity (SRF2015), Whistler, BC, Canada, Sept. 13-18, 2015 AB - A significant advantage of Nb3Sn coated on niobium over conventional bulk niobium is the substantial reduction in the BCS losses at equal temperatures of the former relative to the latter. The quality factor of a 1.3 GHz Nb3Sn cavity is thus almost entirely dictated by the residual resistance at temperatures at and below 4.2 K, which, if minimised, offers the ability to operate the cavity in liquid helium at atmospheric pressure with quality factors exceeding 4·10¹⁰. In this paper we look at the impact of the cooldown procedure – which is intrinsically linked to the effect of spatial and temporal gradients – and the impact of external ambient magnetic fields on the performance of a Nb3Sn cavity. PB - JACoW CY - Geneva, Switzerland SP - 661 EP - 664 KW - cavity KW - niobium KW - SRF KW - radio-frequency KW - accelerating-gradient DA - 2015/12 PY - 2015 SN - 978-3-95450-178-6 DO - 10.18429/JACoW-SRF2015-TUPB044 UR - http://srf2015.vrws.de/papers/tupb044.pdf ER -