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Title: Surface characterization of nitrogen-doped high purity niobium coupons compared with superconducting rf cavity performance

Abstract

We report the results from the measurements of high purity Nb samples and superconducting radio-frequency (SRF) cavities doped with nitrogen and followed by either electropolishing (EP) or buffered chemical polishing (BCP), in order to understand the role of the postdoping treatment on the performance of SRF cavities. The samples characterization via scanning electron microscope, x-ray photoelectron spectroscopy and secondary ion mass spectroscopy showed topographical differences on the surface of the samples after EP versus BCP treatment, but similar surface composition. Radio-frequency measurements were done on single cell cavities made from fine-grain and large-grain Nb treated by nitrogen doping followed by BCP and showed that improved Q 0 in the medium field in both fine-grain and large-grain cavities is possible with BCP postprocessing. However, there are differences between performances of large-grain versus fine-grain cavities after BCP. A cavity made from large-grain Nb showed a larger increase in Q 0 and a lower quench field compared to cavities made from fine-grain Nb.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [3]; ORCiD logo [3]
  1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  2. College of William and Mary, Williamsburg, VA (United States)
  3. National High Magnetic Field Lab, Tallahassee, FL (United States)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1580626
Alternate Identifier(s):
OSTI ID: 1581138
Report Number(s):
JLAB-ACC-19-3101; DOE/OR/23177-4820
Journal ID: ISSN 2469-9888; PRABCJ
Grant/Contract Number:  
SC0009960; AC05-06OR23177; DMR-1157490; DMR-1644779
Resource Type:
Published Article
Journal Name:
Physical Review Accelerators and Beams
Additional Journal Information:
Journal Volume: 22; Journal Issue: 12; Journal ID: ISSN 2469-9888
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Dhakal, Pashupati, Ciovati, Gianluigi, Pudasaini, Uttar, Chetri, Santosh, Balachandran, Shreyas, and Lee, Peter J. Surface characterization of nitrogen-doped high purity niobium coupons compared with superconducting rf cavity performance. United States: N. p., 2019. Web. doi:10.1103/PhysRevAccelBeams.22.122002.
Dhakal, Pashupati, Ciovati, Gianluigi, Pudasaini, Uttar, Chetri, Santosh, Balachandran, Shreyas, & Lee, Peter J. Surface characterization of nitrogen-doped high purity niobium coupons compared with superconducting rf cavity performance. United States. doi:10.1103/PhysRevAccelBeams.22.122002.
Dhakal, Pashupati, Ciovati, Gianluigi, Pudasaini, Uttar, Chetri, Santosh, Balachandran, Shreyas, and Lee, Peter J. Mon . "Surface characterization of nitrogen-doped high purity niobium coupons compared with superconducting rf cavity performance". United States. doi:10.1103/PhysRevAccelBeams.22.122002.
@article{osti_1580626,
title = {Surface characterization of nitrogen-doped high purity niobium coupons compared with superconducting rf cavity performance},
author = {Dhakal, Pashupati and Ciovati, Gianluigi and Pudasaini, Uttar and Chetri, Santosh and Balachandran, Shreyas and Lee, Peter J.},
abstractNote = {We report the results from the measurements of high purity Nb samples and superconducting radio-frequency (SRF) cavities doped with nitrogen and followed by either electropolishing (EP) or buffered chemical polishing (BCP), in order to understand the role of the postdoping treatment on the performance of SRF cavities. The samples characterization via scanning electron microscope, x-ray photoelectron spectroscopy and secondary ion mass spectroscopy showed topographical differences on the surface of the samples after EP versus BCP treatment, but similar surface composition. Radio-frequency measurements were done on single cell cavities made from fine-grain and large-grain Nb treated by nitrogen doping followed by BCP and showed that improved Q0 in the medium field in both fine-grain and large-grain cavities is possible with BCP postprocessing. However, there are differences between performances of large-grain versus fine-grain cavities after BCP. A cavity made from large-grain Nb showed a larger increase in Q0 and a lower quench field compared to cavities made from fine-grain Nb.},
doi = {10.1103/PhysRevAccelBeams.22.122002},
journal = {Physical Review Accelerators and Beams},
number = 12,
volume = 22,
place = {United States},
year = {2019},
month = {12}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevAccelBeams.22.122002

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