Abstract
Sumitomo Heavy Industries, Ltd. (SHI) has developed 4K Gifford–McMahon (GM) cryocoolers for various cryogenic fields including Magnetic resonance imaging (MRI) systems. However, for the purpose of cooling high temperature superconductor (HTS) devices, the needs for cryocoolers with a large cooling capacity in the range of 20–30K has been rapidly increasing.Recently, SHI developed a large cooling capacity single-stage GM cryocooler, for HTS applications. A typical cooling capacity is 46/52W at 20K or 85/96W at 30K with 6.9/7.9kW input power at 50/60Hz. The cooling capacity degradation caused by inclination is within 24%.And also, a low mechanical vibration and a low acoustic noise have been achieved because the displacer is driven by a motor instead of a pneumatic force. In addition, the cryocooler does not contain lead as a regenerator material, so it complies with restriction of hazardous substances (RoHS) directive.
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