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TY - CONF AU - Yang, Z.Q. AU - Lu, X.Y. AU - Tan, W.W. AU - Yang, D.Y. AU - Yang, Y. AU - Zhao, J. ED - Schaa, Volker RW ED - He, Yuan ED - Li, Lu ED - Zhao, Ning TI - Direct Observation of Hydrides Formation of Nitrogen Doping Nb Samples J2 - Proc. of SRF2017, Lanzhou, China, July 17-21, 2017 C1 - Lanzhou, China T2 - International Conference on RF Superconductivity T3 - 18 LA - english AB - Direct observation of hydrides precipitates formation on both nitrogen doped and un-doped Nb samples at 80K has been carried out using Scanning Electron Microscope (SEM) with Cold Stand. We have found that, under our experimental conditions, when the subsequent EP removal is less than 7μm, the amounts of hydrides formed on the surface of doped samples can be effectively reduced. When the subsequent material removal is larger than 9μm, the amounts of precipitated hydrides increased with the EP removal. When the EP removal is 7-9μm, the amounts of hydrides can still be effectively reduced. Also, more hydrides were precipitated on the surface of un-doped samples. The amounts of hydrides of doped samples may be reduced to varying degrees with different amounts of material removal. PB - JACoW CP - Geneva, Switzerland SP - 805 EP - 808 KW - ion KW - niobium KW - experiment KW - cavity KW - electron DA - 2018/01 PY - 2018 SN - 978-3-95450-191-5 DO - 10.18429/JACoW-SRF2017-THPB030 UR - http://jacow.org/srf2017/papers/thpb030.pdf ER -