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RIS citation export for TUPO073: Niobium Sample Analysis for Nitrogen Infusion and Doping

AU  - Konomi, T.
AU  - Kako, E.
AU  - Michizono, S.
AU  - Nagata, T.
AU  - Nojima, T.
AU  - Sakai, H.
AU  - Umemori, K.
ED  - Schaa, Volker RW
ED  - Pei, Guoxi
ED  - Chin, Yong Ho
ED  - Fu, Shinian
ED  - Zhao, Ning
TI  - Niobium Sample Analysis for Nitrogen Infusion and Doping
J2  - Proc. of LINAC2018, Beijing, China, 16-21 September 2018
CY  - Beijing, China
T2  - Linear Accelerator Conference
T3  - 29
LA  - english
AB  - KEK has been investigating the better conditions of the heat treatment in nitrogen, which are called as nitrogen doping and nitrogen infusion. We have tried to understand the high gradient performance of the cavity from the analyses of samples which were prepared in the same conditions for the cavity. The main tools are D-SIMS for the depth profile of the elemental concentration, XPS for composition analysis and SQUID magnetometry for the critical DC magnetic field measurement. The difference in the depth profiles of the nitrogen, carbon and oxygen between the heat treatment conditions was observed in vacuum and furnace temperature of nitrogen infusion by D-SIMS and XPS. Such a difference correlates with the vortex penetration field measured by SQUID. In particular, that of nitrogen doping sample was greatly degraded, while that of nitrogen infusion sample was slightly improved. The tendency is similar to the RF high gradient test results. Details of the sample analysis are shown in this presentation.
PB  - JACoW Publishing
CP  - Geneva, Switzerland
SP  - 506
EP  - 509
KW  - cavity
KW  - niobium
KW  - vacuum
KW  - injection
DA  - 2019/01
PY  - 2019
SN  - 2226-0366
SN  - 978-3-95450-194-6
DO  - DOI: 10.18429/JACoW-LINAC2018-TUPO073
UR  - http://jacow.org/linac2018/papers/tupo073.pdf
ER  -