Precision experiment on the study of helium isotopes cryosorption in terrestrial conditions and at lower gravity

Experiments were conducted to study the character of temperature change with respect to the column height of liquid helium inside a helium cryostat in the case of vapor pumping and in the case of warming up of liquid helium and the cryopanel due to heat. Temperature stratification of liquid helium due to natural convection was calculated. The calculation program for integral characteristics of the liquid heating and cooling process was compiled, accounting for the stratification effect. The problems of the precision experiment on the study of helium isotopes cryosorption in terrestrial conditions and at lower gravity are discussed.