Development of 10 kA Current Leads Cooled by a Cryogenic Mixed-Refrigerant Cycle

27th International Cryogenics Engineering Conference and International Cryogenic Materials Conference 2018

Shabagin, Eugen^1 ; Grohmann, Steffen^1^2

Karlsruhe Institute of Technology (KIT), Institute of Technical Physics, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen

76344, Germany^1

Karlsruhe Institute of Technology, Institute of Thermodynamics and Refrigeration, Engler-Bunte-Ring 21, Karlsruhe

76131, Germany^2

关键词: Conduction cooled;    Cryogenic mixed-refrigerants;    Electrical energy;    Mixture compositions;    Recuperative heat exchangers;    Temperature profiles;    Temperature range;    Thermal modelling;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/502/1/012138/pdf
DOI  :  10.1088/1757-899X/502/1/012138

来源: IOP

【 摘 要 】

Current leads used to supply electrical energy from a room-Temperature power supply to a superconducting application represent a major thermal load and therefore largely determine the operating cost. This paper presents a concept to minimize the thermal load at the cold end by integrating the recuperative heat exchanger of a cryogenic mixed-refrigerant cycle (CMRC). A mixture of non-flammable components is used to absorb the distributed thermal load continuously over the entire temperature range. The paper describes the numerical model that consists of an electric model coupled with a thermal modelling framework, allowing the optimization of the mixture composition and the temperature profiles. Simulations yield a reduction of the thermal load at the cold end by 45 % compared to conventional conduction-cooled current leads.