Investigation of the effect of structural defects from hydride precipitation on superconducting properties of high purity SRF cavity Nb using magneto-optical and electron imaging methods

Wang, Mingmin; Polyanskii, Anatolii; Balachandran, Shreyas; Chetri, Santosh; Crimp, Martin A.; Lee, Peter J.; Bieler, Thomas R.

doi:10.1088/1361-6668/ac4f6a

Title: Investigation of the effect of structural defects from hydride precipitation on superconducting properties of high purity SRF cavity Nb using magneto-optical and electron imaging methods

Journal Article · 13 February 2022 · Superconductor Science and Technology

DOI: https://doi.org/10.1088/1361-6668/ac4f6a · OSTI ID:1845060

;

; Chetri, Santosh; Crimp, Martin A.;

;

Abstract Nb is an elemental superconductor with a critical temperature of 9.3 K and is widely used to fabricate superconducting radiofrequency (SRF) cavities for particle accelerators. However, microstructural defects in Nb, such as grain boundaries (GBs) and dislocations, can act as pinning centers for magnetic flux that can degrade SRF cavity performance. Hydrogen contamination is also detrimental to SRF cavity performance due to the formation of normal conducting hydrides during cool down. In this study, disc shaped Nb bi-crystals extracted from high-purity large-grain Nb slices were investigated to study the effects of GBs, hydrogen, and dislocations on superconducting properties. Grain orientation and GB misorientation were measured using Laue x-ray diffraction and electron backscattered diffraction (EBSD) analyses. Cryogenic magneto-optical imaging was used to directly observe magnetic flux penetration below $T_{c}$ = 9.3 K. Damage caused by low temperature precipitation of hydrides and their dissolution upon reheating after cryogenic cycles was examined using electron channeling contrast imaging, and EBSD. The relationships between hydride formation, dislocation content, GBs, cryo-cooling, heat treatment (HT), and flux penetration indicate that both GB character and hydrogen content affect magnetic flux penetration. Such flux penetration could be facilitated by dislocation structures and low angle GBs resulting from hydride precipitation and HT.

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Research Organization:: Florida State Univ., Tallahassee, FL (United States); Michigan State Univ., East Lansing, MI (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0009960; SC0009962

OSTI ID:: 1845060

Journal Information:: Superconductor Science and Technology, Journal Name: Superconductor Science and Technology Journal Issue: 4 Vol. 35; ISSN 0953-2048

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
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dislocation substructure
electron channeling contrast imaging
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magnetic flux pinning
magneto-optical imaging
niobium hydrides
pure niobium
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Title: Investigation of the effect of structural defects from hydride precipitation on superconducting properties of high purity SRF cavity Nb using magneto-optical and electron imaging methods

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