Measuring ac losses in superconducting cables using a resonant circuit:Resonant current experiment (RESCUE).

Manfred Däumling, Søren Krüger Olsen, Carsten Rasmussen, Chresten Træholt, Anders Van Der Aa Kühle (fratrådt), Ole Tønnesen

    Research output: Contribution to journalJournal articleResearchpeer-review


    A simple way to obtain true ac losses with a resonant circuit containing a superconductor, using the decay of the circuit current, is described. For the measurement a capacitor is short circuited with a superconducting cable. Energy in the circuit is provided by either charging up the capacitors with a certain voltage, or letting a de flow in the superconductor. When the oscillations are started-either by opening a switch in case a de is flowing or by closing a switch to connect the charged capacitors with the superconductor-the current (via a Rogowski coil) or the voltage on the capacitor can be recorded using, for example, a digital oscilloscope. The amplitude decay of the periodic voltage or current accurately reflects the power loss in the system. It consists of two components-an ohmic purely exponential one (from leads, contacts, etc.), and a nonexponential component originating from the superconductor. The method has been successfully applied for the measurement of the ac loss in a 1 m long superconducting cable model.
    Original languageEnglish
    JournalSuperconductor Science & Technology
    Issue number11
    Pages (from-to)1306-1310
    Publication statusPublished - 1998
    Event1998 Applied Superconductivity Conference - Palm Desert, CA, United States
    Duration: 13 Sep 199818 Sep 1998


    Conference1998 Applied Superconductivity Conference
    Country/TerritoryUnited States
    CityPalm Desert, CA


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