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Investigation of cryogenic mixed-refrigerant cooled current leads in combination with peltier elements

Shabagin, E. 1; Raczka, K. 1; Grohmann, S. ORCID iD icon 1
1 Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

Current leads supply electrical energy from a room-temperature power supply to a superconducting application, representing thus a major thermal load. State-of-the-art cooling solutions use either open (vapor cooled) or multi-stage closed cycle systems. The multi-stage concept can be integrated in one cryogenic mixed refrigerant cycle (CMRC), where a wide-boiling fluid mixture absorbs the heat load continuously along the current lead. In this paper, we study the combination of CMRC cooling with Peltier elements at the warm end of DC current leads. The Peltier cooling may cause a temperature drop on the order of 80 K. This allows an optimization of the CMRC mixture composition towards lower temperatures, avoiding the use of high-boilers that risk to freeze out at low temperatures. Our studies suggest that Peltier and CMRC cooling can reduce the thermal load at the cold end by 30 to 45% compared to conventional conduction-cooled current leads.

Verlagsausgabe §
DOI: 10.5445/IR/1000121281
Veröffentlicht am 15.07.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP)
Institut für Technische Thermodynamik und Kältetechnik (TTK)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1757-899X
KITopen-ID: 1000121281
HGF-Programm 37.06.02 (POF III, LK 01) New Power Network Technology
Erschienen in IOP conference series / Materials science and engineering
Verlag Institute of Physics Publishing Ltd (IOP Publishing Ltd)
Band 755
Seiten 012138
Bemerkung zur Veröffentlichung Advances in Cryogenic Engineering: Proceedings of the Cryogenic Engineering Conference (CEC) 2019, 21-25 July 2019, Hartford, Connecticut, USA
Vorab online veröffentlicht am 30.06.2020
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