[1] Grassellino A, Romanenko A, Posen S, et al. N doping: progress in development understing[C]The 17th International Conference on RF Superconductivity. 2015: 4854.
[2] Merio M, Checchin M, Crawfd A, et al. Furnace N2 doping treatments at Fermilab[C]The 17th International Conference on RF Superconductivity. 2015: 423427.
[3] Ge Mingqi, Eichhn R, Elme B, et al. Perfmance of nitrogendoped 9cell SRF cavities in vertical tests at Cnell University[C]The 17th International Conference on RF Superconductivity. 2015: 328332.
[4] Konomi T, Dohmae T, Hi Y, et al. Trial of nitrogen infusion nitrogen doping by using JPARC furnace[C]The 18th International Conference on RF Superconductivity. 2017: 775778.
[5] Sha Peng, Liu Baiqi, Zhang Xinying, et al. R&D of CEPC cavity[C]The 18th International Conference on RF Superconductivity. 2017: 463465.
[6] Palczewski A D, Marhauser F. Material qualification of LCLSII production niobium material including RF flux expulsion measurements on single cell cavities[C]Proc of The 28th Linear Accelerat Conference. 2016: 199202.
[7] Melnychuk O S, Grassellino A, Lewis F, et al. Vertical cavity test facility at Fermilab[C]The 17th International Conference on RF Superconductivity. 2015: 534538.
[9] Checchin M, Martinello M, Melnychuk O S, et al. New insight on nitrogen infusion revealed by successive nanometric material removal[C]The 9th International Particle Accelerat Conference. 2018: 26652667.
[10] Martinello M, Aderhold S, Chrasekaran S K, et al. AntiQslope enhancement in highfrequency niobium cavities[C]The 9th International Particle Accelerat Conference. 2018: 27072709.