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.

Autor: Fedorovich, S. D., Karpov, A. V., Budaev, V. P., Grashin, S. A., Gubkin, M. K., Sliva, A. P., Martynenko, Yu. V., Marchenkov, A. Yu., Lukashevsky, M. V., Zakletskii, Z. A., Vasilyev, G.B., Rogozin, K. A., Quang, V. Tran
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Zdroj: Plasma Physics Reports; Apr2021, Vol. 47 Issue 4, p345-354, 10p
Abstrakt: 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. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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