Temperature Dependent Performance of a Conduction-Cooled Jc(B) Transformer- Rectifier Flux Pump

Transformer-rectifier flux pumps provide an elegant solution for high current generation (>1 kA) in superconducting magnets. By using step-down transformers and superconducting switches they can charge magnets with minimal heat-load between the external and cryogenic components. High temperature...

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Veröffentlicht in:IEEE transactions on applied superconductivity 2023-08, Vol.33 (5), p.1-6
Hauptverfasser: Clarke, Jordan, Leuw, Bradley, Venuturumilli, Sriharsha, Mallett, Ben, Moseley, Dominic A., Bumby, Chris, Badcock, Rodney A.
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Sprache:eng
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Zusammenfassung:Transformer-rectifier flux pumps provide an elegant solution for high current generation (>1 kA) in superconducting magnets. By using step-down transformers and superconducting switches they can charge magnets with minimal heat-load between the external and cryogenic components. High temperature superconductors' type-II superconductivity enables a range of different switching approaches. It was recently shown that a switching approach based on reducing the critical current with an applied DC magnetic field - J c (B) switching - is feasible. The efficiencies of this switching method are an attractive option for a conduction-cooled system where cooling power is limited. In this work we present the first conduction-cooled transformer-rectifier driven by J c (B) switching where we successfully charge a magnet up to its critical current of 115 A whilst monitoring various component temperatures. We explore the parameter space of applied current and switch temperature to establish the effects on the charging time and maximum current.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2023.3247376