A study of a new technology for the first wall design of a high power density fusion reactor has been performed by applying both a newly devised cooling technology, and a mechanical and structural design using the shape memory alloy (SMA) elements. The first wall is quickly replaceable by using a quickly replaceable-technology (QRT) to remove elements which have suffered severe radiation damage. This QRT will enable the design to employ an alternative cooling technology, liquid metal mist cooling (LMMC), to remove high thermal wall loads of up to 4 MW/m2. The LMMC uses a sprayed mist flow containing liquid mist droplets in its carrier gas, which can be operated under low pressure and free from any MHD effect in a strong magnetic field. This new technology is applied here to a cassette compact toroidal reactor (CCTR). Thermal analyses of temperature and thermal stress distributions in the first wall are discussed.
Conceptual design of an evaporation-cooled liquid metal divertor for fusion power plants