Improvement of cooling capacity of 4K GM cryocooler in magnetic fields

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

Morie, Takaaki^1 ; Shiraishi, Taisuke^2 ; Mizuno, Yoji^2 ; Xu, Mingyao^2

Technology Research Center, Sumitomo Heavy Industries Ltd., 19 Natsushima-cho, Yokosuka-city, Kanagawa

237-8555, Japan^1

Precision Equipment Group, Sumitomo Heavy Industries Ltd., 2-1-1 Yato-cho, Nishitokyo-city, Tokyo

188-8585, Japan^2

关键词: A-stable;    Cooling Capacity;    Cryocoolers;    Exposed to;    G-m cryocooler;    High capacity;    Sumitomo heavy industries;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/502/1/012036/pdf
DOI  :  10.1088/1757-899X/502/1/012036

来源: IOP

【 摘 要 】

4K GM cryocoolers have been widely used for cooling superconducting magnets, such as, magnets in MRI, NMR, Magnetic field-Applied Czochralski (MCZ) and electron accelerator systems. In general, high capacity cryocoolers are required to maintain a stable operation for these systems. Cryocoolers are inevitably exposed to the magnetic fields in these superconducting magnet systems. Therefore, it is important that the cooling capacity can be maintained in magnetic fields. Recently, we measured the cooling capacity of a Sumitomo Heavy Industries, Ltd., (SHI) new 4K GM cryocooler, RDE-412, in magnetic fields up to 3.0 T. It is found that the second stage temperature only increases about 0.3 K and the cooling capacity keeps in the specification of 1.25 W at 4.0 K up to 3.0 T.