Document Type

Conference Paper

Publication Date

2015

DOI

10.18429/JACoW-IPAC2015-WEPWI038

Publication Title

Proceedings of the 6th International Particle Accelerator Conference

Pages

3575-3577

Conference Name

6th International Particle Accelerator Conference, May 3-8, 2015, Richmond, Virginia

Abstract

It was recently shown that diffusing nitrogen on the inner surface of superconducting radiofrequency (SRF) cavities at high temperature can improve the quality factor of the niobium cavity. However, a reduction of the quench field is also typically found. To better understand the location of rf losses and quench, we used a thermometry system to map the temperature of the outer surface of ingot Nb cavities after nitrogen doping and electropolishing. Surface temperature of the cavities was recorded while increasing the rf power and also during the quenching. The results of thermal mapping showed no precursor heating on the cavities and quenching to be ignited near the equator where the surface magnetic field is maximum. Hot-spots at the equator area during multipacting were also detected by thermal mapping.

Comments

Copyright © 2015 by JACoW, Geneva, Switzerland.

Published under a Creative Commons Attribution 3.0 Unported (CC BY 3.0) license.

Original Publication Citation

Makita, J., Ciovati, G., & Dhakal, P. (2015). Temperature mapping of Nitrogen-doped Niobium superconducting radiofrequency cavities. In S. Henderson, E. Akers, T. Satogata, & V.R.W. Schaa (Eds.), Proceedings of the 6th International Particle Accelerator Conference (pp. 3575-3577) https://doi.org/10.18429/JACoW-IPAC2015-WEPWI038

ORCID

0000-0002-9381-4091 (Dhakal)

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