Sumitomo Heavy Industries, Ltd.

National Institute for Materials Science

High Energy Accelerator Research Organization

Rui Li

Tomohiro Koyama

Tatsuo Koizumi

Tomiyoshi Haruyama

Takayuki Tomaru

Toshikazu Suzuki

Takakazu Shintomi

Takenori Numasawa

The refrigeration performance in a range from 3 to 10 K can be improved in comparison with conventional metal based magnetic regenerator materials. The refrigerator is provided with a regenerator utilizing at least one magnetic material including a rare earth element and sulfur as the regenerator material.

Ultra-low temperature regenerator and refrigerator

A cryogenic refrigerator includes a first refrigerant tube and a second refrigerant tube each comprising two tubes that are arranged on a cooling stage substantially parallel to each other and communicate with each other through a gas passage formed in the cooling stage. Phase differences are provided to oscillating gas pressures in the first and second refrigerant tubes, to cancel vibration of the cooling stage. Thus, the cryogenic refrigerator can be provided which can effectively reduce the vibration of the cooling stage caused by the oscillating gas pressure and can reduce the size thereof.

Cryogenic refrigerator

A method of running a pulse tube refrigerator which has a regenerator and a pulse tube each defining a high temperature end and a low temperature end, the low temperature ends of the regenerator and the pulse tube being communicated with each other, and the high temperature end of the regenerator being connected to a gas compressor. A cold area is formed at the low temperature ends by periodically supplying working gas from the high temperature end of the regenerator to the regenerator and recovering the working gas from the regenerator. The temperature of the low temperature ends is raised by steadily, pulsatively or intermittently flowing gas in one direction through a communicating area between the low temperature ends of the regenerator and the pulse tube.

Pulse tube refrigerator and its running method

Growing community of inventors

Tokyo, Japan

Rui Li