Cooling and Condensation of Hydrogen Isotopes in Isentropic Compression Device

A compression facility that allows isentropically creating multi-megabar pressure in easily compressed substances and studying their thermodynamic and kinetic properties is developed and successfully used nowadays. The mentioned substances are: rare gases and hydrogen isotopes, converted into condensed initial state. An ultra-high magnetic field MC-1 generator is used for ultra-high pressure obtaining on the device, and a cryostat of special design is used for cooling of the studied substance and its transition to a polycrystalline phase. In the paper we present a design and operating principle of the cryogenic device. By the example of deuterium it is shown how it is possible to describe the cooling and crystallization process. Calculation results and analysis of data of laboratory and field experiments show that at cooling it is possible to obtain the samples with the required sizes and initial temperature, and homogeneous enough in density.