Nitrogen refrigerators for the ITER cryogenic system.
收藏资源简介：
The ITER Tokamak Magnets, Thermal Shields and Cryopumps require a considerable cryogenic power. To supply an average power of 75 kW eq.@4.5 K and 600 kW@80K, several helium refrigerators are used, relying on LN2 for cooling or pre-cooling: this cold power is ensured by 2x LN2 refrigerators. Due to the time dependent heat load of the clients, the cooling capacity generated by the LN2Plants has to vary from 870 to 1200 kW eq.@80K resulting in alternating liquefaction and refrigeration modes. This type of unit, seldom used in scientific facilities, and the simultaneous operation of the plants resulted in the implementation of a robust process control scheme. This communication will present the role, the characteristics and the control strategies of the LN2 plants within the ITER cryogenic system.
