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Forced flow He vapor cooled critical current testing facility for measurements of superconductors in a wide temperature and magnetic field range
Affiliation:1. Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom;2. Bernal Institute, Department of Physics and Energy, University of Limerick, Plassey, Ireland;3. Institute of Power Engineering, Warsaw 02-981, Poland
Abstract:As superconducting materials find their way into applications, there is increasing need to verify their performance at operating conditions. Testing of critical current with respect to temperature and magnetic field is of particular importance. However, testing facilities covering a range of temperatures and magnetic fields can be costly, especially when considering the cooling power required in the cryogenic system in the temperature range below 65 K (inaccessible for LN2). Critical currents in excess of 500 A are common for commercial samples, making the testing of such samples difficult in setups cooled via a cryocooler, moreover it often does not represent the actual cooling conditions that the sample will experience in service. This work reports the design and operation of a low-cost critical current testing facility, capable of testing samples in a temperature range of 10–65 K, with magnetic field up to 1.6 T and measuring critical currents up to 900 A with variable cooling power.
Keywords:Superconductors  Critical current measurement  Vapor cooled
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