Abstract
Studies of samples of graphite heat-shielding facing of the T-15MD tokamak chamber with stationary plasma loads in the PLM plasma device and high-power electron beams simulating loads during ELMs and transient processes were carried out. When the graphite facing samples were tested with plasma loads up to 2 MW/m2, their surface temperature reached more than 1200°C, the surface heating did not lead to cracking, a change in the relief, or significant erosion of the graphite surface. The plasma action led to the growth of a layer of highly porous carbon structures on the surface in the zone of contact with the plasma column. Irradiation of graphite with electron beams with a load of less than 12 MW/m2 did not lead to changes in the surface structure; at a load exceeding 24 MW/m2, the processes of erosion and cracking of the surface along the grain boundaries began. At thermal cyclic loads exceeding 380 MW/m2, effects of significant erosion were observed with a rate of material removal from the graphite surface up to 175 μm/s. The conducted experimental studies and tests are considered as the basis for using the investigated type of graphite as the facing of heat-shielding components of the divertor and the first wall for operation in the T-15MD tokamak.
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Funding
This work was performed under contract no. 09-03/223/74 between the National Research Center “Kur-chatov Institute” and the National Research University “Moscow Power Engineering Institute” in the framework of contract with the Rosatom State Atomiс Energy Corporation ROSATOM no. 1/17519-D/230/4-19. The PLM experiments were supported by the Russian Science Foundation, grant no. 17-19-01469. The electron beam testing was supported by the Russian Foundation for Basic Research, grant No. 19-29-02020. The manufacture of automated s-ystems of scientific research (ASSR) on the PLM was s-upported by the Russian Federation Megagrant no. 14.Z50.31.0042. The analysis of materials was supported by the Ministry of Science and Higher Education of the Russian Federation, project no. FSWF-2020-0023.
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Fedorovich, S.D., Karpov, A.V., Budaev, V.P. et al. Investigation of the Protective Plasma-Facing Graphite In-Vessel Components of T-15MD Tokamak by Steady-State Plasma Loads in the PLM Device and by Powerful Electron Beams. Plasma Phys. Rep. 47, 345–354 (2021). https://doi.org/10.1134/S1063780X21030065
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DOI: https://doi.org/10.1134/S1063780X21030065