Affiliation:
1. Joint Institute for Nuclear Research
Abstract
In the Laboratory of Neutron Physics of the Joint Institute for Nuclear Research, work is underway to create gaseous neutron detectors. To prepare a working mixture of gases, it is necessary to use pure 3He, which is obtained by freezing impurities. The 3He refrigerator was created for this purpose. The refrigerator can also be used to obtain low temperatures in a physics experiment. In this work, the operating modes of the refrigerator are studied. In the continuous mode of 3He circulation, a temperature of 0.78 K was obtained. When 3He vapor is pumped out by an external pump in a single cooling mode, a temperature of 0.52 K is reached. We also study relaxation modes in which, with pre-condensed 3He, the volume of the container plays the role of a pump. A regime is presented in which the temperature of the evaporator relaxes from 1 to 1.5 K within 11 days.
Publisher
The Russian Academy of Sciences