Niobium sample analysis for nitrogen infusion and doping

T. Konomi, E. Kako, S. Michizono, H. Sakai, K. Umemori, T. Nojima, T. Nagata

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

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 anal-yses 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, car-bon and oxygen between the heat treatment conditions, containing the degree of vacuum and furnace temperature of nitrogen injection, was observed by GD-OES, D-SIMS and XPS. Such a difference correlates with the vortex penetration field measured by SQUID. In particular, that of the nitrogen doping sample was greatly degraded, while that of the nitrogen infusion sample was slightly improved. The tendency is consistent with the RF high gradient test results.

Original languageEnglish
Title of host publicationProceedings of the 29th Linear Accelerator Conference, LINAC 2018
PublisherJACoW Publishing
Pages506-509
Number of pages4
ISBN (Electronic)9783954501946
DOIs
Publication statusPublished - 2020
Event29th International Linear Accelerator Conference, LINAC 2018 - Beijing, China
Duration: 2018 Sep 162018 Sep 21

Publication series

NameProceedings of the 29th Linear Accelerator Conference, LINAC 2018

Conference

Conference29th International Linear Accelerator Conference, LINAC 2018
CountryChina
CityBeijing
Period18/9/1618/9/21

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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