Understanding Quality Factor Degradation in Superconducting Niobium Cavities at Low Microwave Field Amplitudes

被引：73

作者：

Romanenko, A. ^{[1
]}

Schuster, D. I. ^{[2
,3
]}

机构：

[1] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[2] Univ Chicago, James Franck Inst, Chicago, IL 60637 USA

[3] Univ Chicago, Dept Phys, Chicago, IL 60637 USA

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 119卷 / 26期

基金：

美国能源部;

关键词：

2-LEVEL SYSTEMS; ACCELERATORS;

D O I：

10.1103/PhysRevLett.119.264801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In niobium superconducting radio frequency (SRF) cavities for particle acceleration, a decrease of the quality factor at lower fields-a so-called low field Q slope or LFQS-has been a long-standing unexplained effect. By extending the high Q measurement techniques to ultralow fields, we discover two previously unknown features of the effect: (i) saturation at rf fields lower than E-acc similar to 0.1 MV/m; (ii) strong degradation enhancement by growing thicker niobium pentoxide. Our findings suggest that the LFQS may be caused by the two level systems in the natural niobium oxide on the inner cavity surface, thereby identifying a new source of residual resistance and providing guidance for potential nonaccelerator low-field applications of SRF cavities.

引用

页数：6

共 42 条

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