Nondestructive testing of niobium sheets for superconducting resonators

We have developed a LTS SQUID system for eddy-current testing of niobium sheets used to fabricate superconducting resonators for particle accelerators. Since the fabrication of superconducting resonators from planar niobium sheets is very costly, a measurement procedure is required which can test th...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2003-06, Vol.13 (2), p.239-244
Main Authors: Muck, M., Welzel, C., Farr, A., Schloz, F., Singer, W.
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electromagnets
Electronics
Exact sciences and technology
Fabrication
Linear particle accelerator
Magnetic materials
Materials testing
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Niobium
Nondestructive testing
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Sheet materials
SQUIDs
Superconducting devices
Superconducting materials
System testing
Testing, measurement, noise and reliability
Various equipment and components
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Summary:We have developed a LTS SQUID system for eddy-current testing of niobium sheets used to fabricate superconducting resonators for particle accelerators. Since the fabrication of superconducting resonators from planar niobium sheets is very costly, a measurement procedure is required which can test the niobium sheets before the resonator is made. Our system can detect relevant surface damage or inclusions of foreign material having a volume of as small as 10/sup -12/ m/sup 3/ in a test sample made from high-purity niobium. Due to the relatively high frequency of the eddy currents of up to 100 kHz, the system-although employing a magnetometer-can be operated in an unshielded environment. The SQUID readout uses 4 MHz AC-flux modulation; a peak-to-peak dynamic range of 15 fluxquanta is obtained at 100 kHz.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2003.813694