An AC susceptometer for the characterization of large, bulk superconducting samples

Details An AC susceptometer for the characterization of large, bulk superconducting samples An AC susceptometer for the characterization of large, bulk superconducting samples

2008-05-09

arxiv.org/abs/0805.1285v1

Physics

Condensed Matter

Superconductivity

25 pages, 7 figures. Accepted for publication in Measurement Science and Technology

Scientific paper

10.1088/0957-0233/19/8/085705

The main purpose of this work was to design, develop and construct a simple, low-cost AC susceptometer to measure large, bulk superconducting samples (up to 32 mm in diameter) in the temperature range 78-120 K. The design incorporates a double heating system that enables a high heating rate (25 K/hour) while maintaining a small temperature gradient (< 0.2 K) across the sample. The apparatus can be calibrated precisely using a copper coil connected in series with the primary coil. The system has been used successfully to measure the temperature dependence of the AC magnetic properties of entire RE-Ba-Cu-O [(RE)BCO] bulk superconducting domains. A typical AC susceptibility measurement run from 78 K to 95 K takes about 2 hours, with excellent temperature resolution (temperature step ~ 4 mK) around the critical temperature, in particular.

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