Contactless loop method for measurement of AC losses in HTS coils

Nuno Amaro, Jan Souc, João Miguel Murta Pina, João Francisco Alves Martins, Jose Maria Ceballos, Fedor Goemoery

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Measurement of AC losses in high temperature superconducting (HTS) coils are of utmost importance for power applications, as these are one of the most limiting factors in superconducting devices. There are two possible ways to measure such losses – calorimetric and electromagnetic methods. An electromagnetic method using a contactless loop is reported in this work. To verify the applicability of such method in medium to large sized coils, two different contactless loops were designed and built and results are compared with those obtained from measurements made with different configurations of voltage taps. All tests were performed at 77 K, using a superconducting coil with a variable number of turns (up to a maximum of 128) wound from BSCCO tape. Currents ranging from zero to the critical value were applied, at frequencies from 72 to 1152 Hz.
Original languageEnglish
Article number9000604
JournalIeee Transactions On Applied Superconductivity
Issue number3
Publication statusPublished - Jun 2015


  • AC losses
  • AC losses measurement
  • contactless loops
  • HTS Coils


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