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The Experimental Advanced Superconducting Tokamak (EAST) had been under major upgrading from 2020 to 2021 in China. In this campaign of major upgrading, the new lower tungsten divertor is successfully installed to achieve the targets of long pulse and high β H-mode plasma operation. High temperature and high pressure Divertor primary heat transfer system (DIV PHTS) is also developed to remove the plasma deposition heat load on the Divertor. This paper presents a description of the design and construction of DIV PHTS for EAST Tokamak. Starting from the requirements specified in the Technical Specifications of DIV PHTS, the process to meet the Divertor cooling and baking requirement is designed and validated by the supported thermal-hydraulic analysis. Then, the piping stress analysis under different types of load combinations is performed to verify the structural design requirements. General layout design is also performed based on the component requirement and the allocated space in the EAST Tokamak hall. Finally, the procurement and test of the system main equipment is also given. [ABSTRACT FROM AUTHOR]

• CFETR central solenoid model coil heat treatment was successfully completed. • The calculation and simulation heat transfer model of Nb 3 Sn coil heat treatment is established. • The design of the inner cover improves the temperature uniformity of the Nb 3 Sn coil heat treatment. • To provide experience for other large superconducting coil heat treatment in China. The heat treatment of Nb 3 Sn coils of China Fusion Engineering Test Reactor (CFETR) central solenoid model coil (CSMC) has been completed at the Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP). The brittle A15 phase material requires coil winding prior formation of the superconducting material, and the technology of "wind and react" has been used to manufacture Nb 3 Sn coil. The Nb 3 Sn coils were heat-treated under the argon atmosphere and the heat treatment was successful. Since the critical properties of Nb 3 Sn strongly depend on the heat treatment temperature, especially the uniformity of temperature, it is necessary to analyze the detailed temperature change process during the heat treatment. During the heat treatment, several thermocouples were arranged on the coil surface for temperature monitoring. At the same time, the heat transfer process of heat treatment and the distribution of the coil temperature field is theoretically analyzed and simulated. The uniformity of heat treatment temperature meets the requirements. This paper mainly presents the heat transfer analysis, heat treatment process, and numerical simulations during heat treatment. [ABSTRACT FROM AUTHOR]