Preliminary Design for the First Wall in Low Magnetic Side of HL-2M

Considering the risk of leakage and the complexity of processing technology, a passive cooling first wall has been developed in the low magnetic side. The anticipated heat flux limit of the first wall is about 0.3 MW/m2. In order to enhance thermal transfer, the main materials of the first wall is made of copper alloy (CuCrZr) and graphite tile. A layer of flexible graphite is placed in the interface of CuCrZr and graphite tile to increase thermal contact resistance. Transient thermal analysis has been used to predict the whole heat transfer process for normal operating discharge in a day. Through the simulation, we can get the temperature change history of each component in 24 hours. The temperature and stresses of the passive cooling first wall are found to be within the acceptable limits. The maximum temperature of this first wall is about 307 °C which appears on the graphite tile. The results of the maximum temperature distribution are imported into the structure for calculation. Finally, the elasto-plastic fatigue analysis method is used to check the structural analysis results, and the results show that the structure meets the high parameter discharge mode of more than 480,000 times.