Application of RGT graphite in fusion devices

Abstract

The application of fine-grained recrystallized RGT graphite modified by titanium is considered. Thermally stabilized fine-grained RGT graphite modified by 10 at.% Ti has a density of 2.1 g cm−3, a heat conductivity of up to 800 W m−1 K−1, a low porosity and a small retention of hydrogen isotopes. The paper presents the results of full-scale tests on RGT graphite samples carried out in the T-10 and T-11M tokamaks in Russia, in the DIII-D tokamak in the USA, and in the MK-200 and PLADIS plasma facilities. The tested samples made from RGT graphite were found to be sufficiently stable, in particular, under irradiation for 600 ms by plasma with an electron temperature of 60 eV, an electron density of 2.5×1014 cm−3 and a power of the parallel heat flux of 5 kW cm−2, which are typical for the working modes and disruptions of plasma discharges in tokamaks.