Simple Method for Measurement of Decay Rate in Superconducting Magnet

概要

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We have fabricated a simple and inexpensive sensor for measurements of decay rate of a magnetic field under a persistent mode in superconducting magnets using the magnetoresistance of a commercial copper wire of 0.1 mm diameter. We have found that the magnetoresistance of the copper wire has good reproducibility and no hysteresis up to 15 T at 4.2 K. Using this copper wire sensor, we can measure the decay rate with an accuracy of 1 ppm in the persistent mode of 15 T at 4.2 K. We also found that commercial GaAs Hall elements can be used for low temperatures experiments and that this copper wire sensor has advantages in terms of reproducibility and hysteresis compared with GaAs Hall elements.
社団法人応用物理学会の論文
1995-07-15