Ultralow temperature apparatus

Abstract

Abstract PURPOSE:To keep an approximately constant heat load of a refrigerator while setting the compressor intake pressure at a value above an atmospheric pressure, by making an output of a resistive heater being mounted in a helium vessel variable according to its internal pressure. CONSTITUTION:A resistive heater 20 is mounted on an internal face being positioned under the liquid helium face in the helium vessel 2. A controller 21 which is connected to the heater 20, controls the output of the heater 20 according to a signal sent from a detector for detecting an internal pressure in the helium vessel. In this way, with the intake pressure of the compressor being above an atmospheric pressure, it can be prevented that air, etc. may be mixed into helium. Moreover, the heat load of the refrigerator can be maintained at an approximately constant level and a stable ultralow temperature condition can be held.

Inventors

• 👤 Osamu Osaki
• 👤 大崎　治
• 👤 Hiroshi Suzuki
• 👤 浩 鈴木

Bibliographic Details