Download file (522 KB)
Download as zip (491 KB)

Collection

Citation

Description:

This study is aiming to develop a low power consumption 4 K G-M cryocooler. As a first step, a two-stage G-M cryocooler with a 2 kW class compressor has been tested. The base model of cold head of two-stage G-M cryocooler is RDK-305D (Sumitomo Heavy Industries). We modified its second stage regenerator materials by filling magnetic materials Gd2O2S and HoCu2 spheres. An air-cooled compressor of SA115 (ULVAC CRYOGENICS) that rated input is 1.9 kW at 60 Hz was connected to the cold head. The experimental results showed that the cooling capacity of the second stage of 0.5 W at 4.2 K and the first stage of 25 W at 45 K was achieved with the cold head reciprocating speed of 48 rpm and the compressor electrical input of 2.09 kW. The relative Carnot efficiency of 1.7% at 4.2 K was calculated from the result. A low reciprocating speed of 48 rpm was chosen is to secure the sufficient expansion work in the second expansion space. This is considered an effective method to obtain a large cooling capacity at 4 K by low power compressor.

Rights:

• cc-by-3.0
  

Keyword: 4 K G-M cryocooler, reciprocating speed, low power cunsumption

Date published: 2022-05-01

Publisher: IOP Publishing

Journal:

• IOP Conference Series: Materials Science and Engineering (ISSN: 17578981) vol. 1240 012129

Funding:

• JST未来社会創造事業　大規模プロジェクト型 JPMJMI18A3

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5156

First published URL: https://doi.org/10.1088/1757-899x/1240/1/012129

Related item:

Other identifier(s):

Contact agent:

Updated at: 2024-12-16 16:30:43 +0900

Published on MDR: 2024-12-16 16:30:43 +0900