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Superconducting magnets of toroidal field (TF) and poloidal field (PF) of HT-7Utokamak are all made of NbTi/Cu Cable-in-Conduit Conductor (CICC), and cooled with a forcedflow supercritical helium of 3.8 K. A helium refrigerator with an equivalent capacity of 2 kW/4K will be constructed. This paper presents the design of the helium refrigerator process, thethermodynamics of the refrigeration cycle and the refrigerator equipments.
Superconducting magnets of toroidal field (TF) and poloidal field (PF) of HT-7Utokamak are all made of NbTi / Cu Cable-in- Conduit Conductor (CICC), and cooled with a forced flow supercritical helium of 3.8 K. A helium refrigerator with an equivalent capacity of 2 kW / 4K will be constructed. This paper presents the design of the helium refrigerator process, the thermodynamics of the refrigeration cycle and the refrigerator equipments.