Speaker
Description
With the increasing requirements of the operating parameter of DEMO fusion devices to realize power generation, the Toroidal Field (TF) magnet is required to withstand a substantial thermal load. BEST (Burning Plasma Experimental Superconducting Tokamak), a novel Tokamak machine in China, has been developed to achieve Deuterium-Tritium fusion. The maximum fusion power is 130MW and the nuclear heat within a TF magnet amounts to 160 kW. The TF magnet is cooled by supercritical helium with temperature of 4.2 K. To ensure a steady operation of TF magnet, an thermal hydraulic analysis is urgent. The conductors with the highest magnetic field and maximum nuclear heat are taken as the analysis object. Firstly, an electromagnetic analysis is carried out to obtain the magnetic field distribution of the conductors. Subsequently, the nuclear heat is calculated to gain the thermal load on TFCC (TF coil case) and WP (winding pack). Then, the steady thermal analysis is conducted to gain the thermal conduction from TFCC to WP. Finally, thermal hydraulic analysis is undertaken. To solve the technical challenges associated with high fusion power operation, where the temperature rise of superconducting conductors varies significantly over time and space under various thermal loads, making it difficult to determine the minimum temperature margin, the project team has developed a multi-heat source loading program integration and it can achieve precise dynamic thermal load loading and obtain efficient evaluation of the minimum temperature margin under non-steady-state conditions. The results indicate that the temperature margin of conductor is over 1.7 K.
| Submitters Country | China |
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