Conclusions

Our investigation found that both PULSAR first wall designs were acceptable provided erosion rates are limited to 240m per year for the vanadium alloy design and 130m per year for the SiC composite design. The vanadium divertor was also acceptable, though erosion must be less than 160m per year if the divertor is to last 40,000 cycles. The SiC composite divertor is not acceptable. Design of a viable SiC composite divertor will require a thermal conductivity greater than 25 W/mK, still greater improvements in the heat transfer coefficient, tubes short enough and headers compliant enough to approach free-bending conditions and very low erosion rates.