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RIS citation export for WEPMR027: Dependence of Surface Resistance on N-Doping Level

AU - Gonnella, D.
AU - Furuta, F.
AU - Ge, G.M.
AU - Kaufman, J.J.
AU - Koufalis, P.N.
AU - Liepe, M.
AU - Maniscalco, J.T.
ED - Petit-Jean-Genaz, Christine
ED - Kim, Dong Eon
ED - Kim, Kyung Sook
ED - Ko, In Soo
ED - Schaa, Volker RW
TI - Dependence of Surface Resistance on N-Doping Level
J2 - Proc. of IPAC2016, Busan, Korea, May 8-13, 2016
C1 - Busan, Korea
T2 - International Particle Accelerator Conference
T3 - 7
LA - english
AB - Nitrogen-doping has become a standard tool for reaching high quality factors in SRF cavities in the medium field region at 2 K. This high Q has been shown to be a result of lowering of the temperature dependent BCS resistance. Here we show that this lowering of the BCS resistance is due to interstitial nitrogen in the niobium lowering the mean free path. The BCS resistance extracted from experimental data is shown to be consistent with theoretical predictions from BCS theory; that there is an optimal doping of which the mean free path is lowered to about half the intrinsic coherence length. These results provide insight into understanding the mechanisms behind nitrogen-doping and allow us to more accurately predict doping parameters to reach optimal cavity performance.
CP - Geneva, Switzerland
SP - 2331
EP - 2334
KW - niobium
KW - cavity
KW - linac
KW - radio-frequency
DA - 2016/06
PY - 2016
SN - 978-3-95450-147-2
DO - 10.18429/JACoW-IPAC2016-WEPMR027
UR - http://jacow.org/ipac2016/papers/wepmr027.pdf
ER -