EVAPORATIVE CRYOGENIC SYSTEM FOR HIGH POWER HTS LONG EXTENSION CABLES

The article analyzes the results of theoretical and experimental studies of the evaporative cryogenic system for extended temperature control channels of high-temperature superconducting cables and hybrid power lines as well as systems for maintaining the thermal regime of cryogenic fuel components in the tanks of aircraft during long space flights. Experimental data obtained with nitrogen and hydrogen are presented. The importance of such studies for practical use in the development of modern cryostat systems is shown. The design of the experimental hybrid power line for studying the processes of thermostating of superconducting cable lines of high power is considered. The main line consists of three sections with different types of thermal insulation and current inputs which provide the supply of an electric current of high power to superconducting veins with a minimum external heat input. Unique experimental data on heat inflows from the outer surface of the main line at various sites have been obtained. The article shows it is possible to fully compensate external heat input into the cryogenic line, and, if necessary, to lower the temperature of the cryogenic coolant in the section with the evaporative cryostat system. With the help of a mathematical model describing the physical processes in the thermostatic channel with the evaporative cryostat system, the estimates were made using liquid nitrogen and liquid hydrogen as the working fluid for various mass flow rates of the coolant supply in order to determine the possible length of the cryostat working zone of the extended superconducting cable. Calculated data are obtained on the change in temperature, pressure, and cooling capacity of an evaporative cryostat system along the length of an extended cryostat.

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