Abstract
A cryostat is described which is designed for the research of inelastic scattering of neutrons on a large volume (3.5 l) of He 4 between 4.2 and 0.5 K. Temperatures lower than 1.3 K are produced by means of pumping out vapour above liquid He 3 (∼ 330 cm 3) with an adsorption pump (1 kg of coal CKT-2) located in the device itself. A minimum temperature is held during 140 h. The essential time for the cryostat start is about 10 h. The cryostat was used for the measurement of temperature dependence of the Bose-condensate density in He 4.
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