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RIS citation export for TUFUA1: The Field-Dependent Surface Resistance of Doped Niobium: New Experimental and Theoretical Results

AU  - Maniscalco, J.T.
AU  - Arias, T.
AU  - Ge, M.
AU  - Koufalis, P.N.
AU  - Liarte, D.
AU  - Liepe, M.
AU  - Sethna, J.P.
AU  - Sitaraman, N.
ED  - Michel, Peter
ED  - Arnold, André
ED  - Schaa, Volker RW
TI  - The Field-Dependent Surface Resistance of Doped Niobium: New Experimental and Theoretical Results
J2  - Proc. of SRF2019, Dresden, Germany, 30 June-05 July 2019
CY  - Dresden, Germany
T2  - International Conference on RF Superconductivity
T3  - 19
LA  - english
AB  - We present systematic work investigating how different doping and post-doping treatments affect the BCS surface resistance at 1.3~GHz and higher frequencies. We examine the field-dependent BCS resistance at many temperatures as well as the field-dependent residual resistance and use the results to reveal how impurity species and concentration levels affect the field-dependent RF properties. We further demonstrate the importance of thermal effects and their direct dependence on doping level. We use the tools of Density Functional Theory to work towards an {\em ab initio} model of electron overheating to theoretically confirm the impact of doping, create a full model that includes thermal effects to predict the field dependent resistance, and show that the predictions of the model agree with results from doped and non-doped cavities ({\em e.g.} the strength of the anti-Q-slope and the high-field Q slope). Finally, we use our experimental results to systematically assess and compare theories of the field-dependent BCS resistance, showing that the current theory on smearing of the density of states is incomplete.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 340
EP  - 346
KW  - cavity
KW  - niobium
KW  - electron
DA  - 2019/08
PY  - 2019
SN  - 978-3-95450-211-0
DO  - doi:10.18429/JACoW-SRF2019-TUFUA1
UR  - http://jacow.org/srf2019/papers/tufua1.pdf
ER  -