Effect of high temperature heat treatments on the quality factor of a large-grain superconducting radio-frequency niobium cavity

被引：71

作者：

Dhakal, P. ^{[1
]}

Ciovati, G. ^{[1
]}

Myneni, G. R. ^{[1
]}

Gray, K. E. ^{[2
]}

Groll, N. ^{[2
]}

Maheshwari, P. ^{[3
]}

McRae, D. M. ^{[4
]}

Pike, R. ^{[5
]}

Proslier, T. ^{[2
]}

Stevie, F. ^{[3
]}

Walsh, R. P. ^{[4
]}

Yang, Q. ^{[6
]}

Zasadzinzki, J. ^{[7
]}

机构：

[1] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA

[2] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60493 USA

[3] N Carolina State Univ, Raleigh, NC 27695 USA

[4] Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32310 USA

[5] Coll William & Mary, Williamsburg, VA 23187 USA

[6] Norfolk State Univ, Ctr Mat Res, Norfolk, VA 23504 USA

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

来源：

PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS | 2013年 / 16卷 / 04期

关键词：

HYDROGEN;

D O I：

10.1103/PhysRevSTAB.16.042001

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Large-grain Nb has become a viable alternative to fine-grain Nb for the fabrication of superconducting radio-frequency cavities. In this contribution we report the results from a heat treatment study of a large-grain 1.5 GHz single-cell cavity made of "medium purity" Nb. The baseline surface preparation prior to heat treatment consisted of standard buffered chemical polishing. The heat treatment in the range 800-1400 degrees C was done in a newly designed vacuum induction furnace. Q(0) values of the order of 2 x 10(10) at 2.0 K and peak surface magnetic field (B-p) of 90 mT were achieved reproducibly. A Q(0) value of (5 +/- 1) x 10(10) at 2.0 K and B-p = 90 mT was obtained after heat treatment at 1400 degrees C. This is the highest value ever reported at this temperature, frequency, and field. Samples heat treated with the cavity at 1400 degrees C were analyzed by secondary ion mass spectrometry, x-ray photoelectron spectroscopy, energy dispersive x ray, point-contact tunneling, and x-ray diffraction, and revealed a complex surface composition which includes titanium oxide, increased carbon, and nitrogen content but reduced hydrogen concentration compared to a non-heat-treated sample. DOI: 10.1103/PhysRevSTAB.16.042001

引用

页数：14

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