a Compact Cooling System for Hts Power Cable Based on Thermal Siphon for Circulation of LN2

In recent years, the technologies of manufacturing of high-temperature superconducting (HTS) tapes have achieved the critical current of 100 A. An era of industrial application of HTS power supply cables is coming. The liquid nitrogen (LN2) is usually used to keep the HTS cable at low temperature. LN2 must circulate inside the cryopipes, and the pump is used. However, the pump power is one of heat loads for the cryogenic system, and if it is high the effectiveness of the SC cable system decreases. In order to resolve this problem, a thermal siphon can be applied to circulate LN2. One of the possible system configurations have been analyzed recently by Radovinsky and Zhukovsky [1] along the basic idea proposed by S. Yamaguchi as collaboration between Chubu University and MIT. Here, we discuss the effectiveness of thermal siphon with a counter-flow circulation loop composed of a cryogen flow channel and an inner cable channel. Such configuration simplifies apparatus significantly, especially for short-distance applications.