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Nondestructive testing of niobium sheets for superconducting resonators

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5 Author(s)
Muck, M. ; Inst. of Appl. Phys., Justus-Liebig Univ. Giessen, Germany ; Welzel, Christian ; Farr, A. ; Schloz, F.
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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 10-12 m3 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.

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:13 ,  Issue: 2 )