Abstract
A simple automatic supply system for liquid helium has been constructed and tested. This is composed of a 100L liquid container, a cryostat having a vaporizing rate of about 5L/day, a 1m-long flexible transfer-tube, two solenoid valves, a 5W electric heater, a container pressure sensor and controller, and two liquid level sensors and controllers. The system has no bypass and valves for cooldown of the transfer-tube. Since pressurization of the container is performed through vaporization of liquid by the heater, safety apparatuses have been introduced to prevent over-pressure and heating without liquid. A simple and reliable system operation has been proved by the model experiment and ordinary use.
