Abstract
The key features of the proposed divertor design concept based on the specific liquid metal (LM) coolant properties are as follows: the requirement of the vacuum tightness of the divertor cooling tract is dismissed; the pressurized coolant ducts can be separated from the plasma-facing structure (PFS) elements which are subjected to the thermal loads, and with this feature the PFS can be replaced independently, without disturbing the cooling system. The divertor targets of the type found in free LM-flow-cooled cells have been adjusted to the double-null gaseous divertor geometry. The performed design study included the following major issues: a materials review; in-reactor thermal hydraulics; divertor target thermal-stress analysis; LM loop evaluation; safety considerations, including Ga activation, accident analysis and estimate of the dose due to tritium release.
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