Analysis of the Reliability and Availability of the 2 K Superfluid Helium System

The high thermal conductivity and inviscid flow characteristics of superfluid helium in the 2 K temperature make it the best coolant for cooling superconducting magnets. The application of superfluid helium cooling system can increase the critical current density of superconductors, obtain higher magnetic field strength, and have superior material properties This paper designed a 2 K superfluid helium system. Through reliability analysis, the system has a design life of 8118 hours, a reliability of 80.8% in 3 months, a reliability of 38.8% in 1 year, and an availability of 90.7% in 1 year, as well as 87.5% availability of 2 years. According to the probability importance of distribution, the long-term focus should be on the maintenance and repair of 2 K heat exchanger, vacuum pump, and liquid nitrogen thermal shield.