Analysis of Nb3Sn surface layers for superconducting radio frequency cavity applications

被引：36

作者：

Becker, Chaoyue ^{[1
,2
,3
]}

Posen, Sam ^{[4
]}

Groll, Nickolas ^{[1
,2
]}

Cook, Russell ^{[5
]}

Schlepuetz, Christian M. ^{[6
]}

Hall, Daniel Leslie ^{[4
]}

Liepe, Matthias ^{[4
,7
]}

Pellin, Michael ^{[1
]}

Zasadzinski, John ^{[3
]}

Proslier, Thomas ^{[1
,2
]}

机构：

[1] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

[2] Argonne Natl Lab, Div High Energy Phys, Argonne, IL 60439 USA

[3] IIT, Dept Phys, Chicago, IL 60616 USA

[4] Cornell Lab Accelerator Based Sci & Educ, Ithaca, NY 14853 USA

[5] Argonne Natl Lab, Nanosci & Technol Div, Argonne, IL 60439 USA

[6] Argonne Natl Lab, Xray Sci Div, Argonne, IL 60439 USA

[7] Cornell Univ, Dept Phys, Ithaca, NY 14853 USA

来源：

APPLIED PHYSICS LETTERS | 2015年 / 106卷 / 08期

关键词：

V3SI;

D O I：

10.1063/1.4913617

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We present an analysis of Nb3Sn surface layers grown on a bulk Niobium (Nb) coupon prepared at the same time and by the same vapor diffusion process used to make Nb3Sn coatings on 1.3 GHz Nb cavities. Tunneling spectroscopy reveals a well-developed, homogeneous superconducting density of states at the surface with a gap value distribution centered around 2.7 +/- 0.4 meV and superconducting critical temperatures (T-c) up to 16.3 K. Scanning transmission electron microscopy performed on cross sections of the sample's surface region shows an similar to 2 mu m thick Nb3Sn surface layer. The elemental composition map exhibits a Nb:Sn ratio of 3:1 and reveals the presence of buried sub-stoichiometric regions that have a ratio of 5:1. Synchrotron x-ray diffraction experiments indicate a polycrystalline Nb3Sn film and confirm the presence of Nb rich regions that occupy about a third of the coating volume. These low Tc regions could play an important role in the dissipation mechanisms occurring during RF tests of Nb3Sn-coated Nb cavities and open the way for further improving a very promising alternative to pure Nb cavities for particle accelerators. (C) 2015 AIP Publishing LLC.

引用

页数：4

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