Feasibility study of parallel conduction cooling of NbTi magnet and sample probe in a cryogen-free magnet system

26th International Cryogenic Engineering Conference & International Cryogenic Materials Conference 2016

材料科学;物理学

Catarino, I.^1 ; Soni, V.^2 ; Barreto, J.^1 ; Martins, D.^1 ; Kar, S.^2

LIBPhys-UNL, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Portugal^1

Inter-University Accelerator Centre, New Delhi, India^2

关键词: Conduction-cooling;    Cooling power;    Cryogen free magnets;    Feasibility studies;    Heat switches;    Parallel conduction;    Parallel configuration;    Sample probe;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012127/pdf
DOI  :  10.1088/1757-899X/171/1/012127

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The conduction cooling of both a 6 T superconducting magnet along with a sample probe in a parallel configuration is addressed in this work. A Gifford-McMahon (GM) cryocooler is directly cooling the NbTi magnet, which aims to be kept at 4 K, while a gas-gap heat switch (GGHS) manages the cooling power to be diverted to the sample probe, which may be swept from 4 K up to 300 K. A first prototype of a GGHS was customized and validated for this purpose. A sample probe assembly has been designed and assembled with the existing cryogen-free magnet system. The whole test setup and components are described and the preliminary experimental results on the integration are presented and discussed. The magnet was charged up to 3 T with a 4 K sample space and up to 1 T with a sweeping sample space temperature up to 300 K while acting on the GGHS. Despite some identified thermal insulation problems that occurred during this first test, the overall results demonstrated the feasibility of the cryogen-free parallel conduction cooling on study.