Сравнение вариантов литиевого дивертора для токамака ДЕМО-ТИН

For the DEMO-FNS tokamak being developed in Russia, the choice of the divertor concept with evaporating liquid lithium is discussed, which meets the requirements for removing the heat load from the peripheral plasma and provides an acceptable level of change in the ionic composition of the core plasma. The paper presents the results of numerical modeling and optimization of divertor parameters with several chambers partitioned by slotted nozzles. The parameters of lithium fluxes flowing into the peripheral layer are estimated for the temperature range of the divertor chambers from 500 to 1000 K under gas-kinetic and molecular flow regimes of lithium vapor from the divertor. The fulfilled analysis of processes that reduce the outflow of lithium from the chambers and its penetration into the core plasma volume inside the separatrix showed that sectioning effectively reduces the Li fluxes to acceptable levels of ~ 1020 atoms per second.

The application features of the modified graphitized carbon lining materials in the alumina electrolysis cell

It was studied how Sodium penetrates inside the samples of the Lithium-modified graphitized carbon material (GCM). The Sodium diffusion coefficients were defined after the GCM's treatment by the Lithium vapor and the diffusion activation energy was calculated for different conditions. The obtained kinetic dependencies allowed to establish the mechanism of Sodium diffusion into the modified GCM. It was shown to be reasonable to expose the GCM's samples to the preliminary treatment by the Lithium vapor which prevents the destruction of the alumina electrolysis cells' cathode surface's lining layers and thus increases its service life. As the tested GCM's samples demonstrated, the possibility was achieved to develop the protection technology of the bottom surface of the Sodium penetration in course of the electrolysis in the alumina-cryolite melts.