Understanding mechanism of performance improvement in nitrogen-doped niobium superconducting radio frequency cavity

Xiaotian Fang; Jin-Su Oh; Matt Kramer; A. Romanenko; A. Grassellino; John Zasadzinski; Lin Zhou

doi:10.1080/21663831.2022.2126737

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Understanding mechanism of performance improvement in nitrogen-doped niobium superconducting radio frequency cavity

Original Reports | 更新时间：2026-08-19

- Understanding mechanism of performance improvement in nitrogen-doped niobium superconducting radio frequency cavity
- Materials Research Letters Vol. 11, Issue 2, Pages: 108-116(2023)
- 作者机构：
  
  1. a Division of Materials Science and Engineering Ames National Laboratory
  2. b Fermi National Accelerator Laboratory Batavia
  3. c Department of Physics Illinois Institute of Technology Chicago
  4. a Division of Materials Science and Engineering Ames National Laboratory Ames United States
  5. d Department of Materials Science and Engineering Iowa State University
- 作者简介：
- 基金信息：
- DOI：10.1080/21663831.2022.2126737
  CLC：
- Online First：29 September 2022，
  
  Published：2023
- 稿件说明：
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Xiaotian Fang, Jin-Su Oh, Matt Kramer, et al. Understanding mechanism of performance improvement in nitrogen-doped niobium superconducting radio frequency cavity[J]. Materials Research Letters, 2023, 11(2): 108-116.
DOI：

Xiaotian Fang, Jin-Su Oh, Matt Kramer, et al. Understanding mechanism of performance improvement in nitrogen-doped niobium superconducting radio frequency cavity[J]. Materials Research Letters, 2023, 11(2): 108-116. DOI： 10.1080/21663831.2022.2126737.

摘要

Abstract

BSTRACTNiobium superconducting radiofrequency cavities enable applications in modern accelerators and quantum computers. However

the surface resistance significantly deteriorates the cavities’ performance. Nitrogen doping surface treatment can consistently increase cavity performance by reducing surface resistance

but the improvement mechanism is not fully understood. Herein

we employed transmission electron microscopy and spectroscopy to uncover the structural and chemical differences of the Nb/air interface between the non-doped and nitrogen-doped cavities. The results indicate that nitrogen doping passivates the Nb surface by introducing a compressive stress/strain close to the Nb/air interface

which impedes the diffusion of oxygen and hydrogen atoms and reduces surface oxide thickness.

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