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RIS citation export for TUFUA5: Recent Development on Nitrogen Infusion Work Towards High Q and High Gradient

AU  - Dhakal, P.
ED  - Michel, Peter
ED  - Arnold, André
ED  - Schaa, Volker RW
TI  - Recent Development on Nitrogen Infusion Work Towards High Q and High Gradient
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  - A quality factor as high as 2 × 10¹⁰ at 1.5 GHz was achieved at a gradient of 35 MV/m by 800 °C annealing and N-infusion at 140 °C. A comparison of the field dependence of the surface resistance after N-infusion with a recent theoretical model that extends the calculation of the BCS surface resistance to high rf fields suggests an increase in the quasiparticles’ relaxation time with increasing infusion temperature, which could be due to a decreasing density of subgap states. Nb coupons treated similarly showed the formation of thicker oxynitride layer on the surface beneath thin dielectric Nb₂O₅ layer. A plausible explanation for the improved Q₀  is that the oxynitride layer on the Nb surface adds additional electron scattering within RF penetration depth.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 355
EP  - 359
KW  - cavity
KW  - niobium
KW  - injection
KW  - radio-frequency
DA  - 2019/08
PY  - 2019
SN  - 978-3-95450-211-0
DO  - doi:10.18429/JACoW-SRF2019-TUFUA5
UR  - http://jacow.org/srf2019/papers/tufua5.pdf
ER  -