Enhancement in Quality Factor of SRF Niobium Cavities by Material Diffusion

Author

Dhakal, Pashupati ; Ciovati, Gianluigi ; Kneisel, Peter ; Myneni, Ganapati Rao

Author_Institution

Jefferson Lab., Newport News, VA, USA

Volume

25

Issue

3

fYear

2015

fDate

Jun-15

Firstpage

1

Lastpage

4

Abstract

We report the increase in the quality factor of superconducting radiofrequency cavities when small concentrations of nonmagnetic impurities such as titanium and nitrogen are thermally diffused into the inner surface. Several cavities made from ingot niobium with residual resistivity ratio (RRR) ~ 100-300 and a fine-grain reactor grade cavity with RRR <; 100 were thermally doped with titanium and nitrogen in the temperature range of 800 °C-1400 °C. The magnitude of the increase in quality factor is related to the process parameters and is similar to that observed in fine-grain high-purity niobium cavities.

Keywords

Q-factor; niobium; nitrogen; superconducting materials; titanium; N; Nb; SRF niobium cavities; Ti; ingot; material diffusion; quality factor; residual resistivity ratio; superconducting radiofrequency cavities; temperature 800 C to 1400 C; Cavity resonators; Doping; Niobium; Nitrogen; Q-factor; Radio frequency; Titanium; Material diffusion; niobium; quality factor; superconducting radiofrequency (SRF) cavities;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2014.2359640

Filename

6906233