Study of Heat Load on EAST Divertor Plates by an Infrared Camera

摘要

The infrared diagnosis system is an efficient tool to provide the immediate temperature distribution on the divertor plate, which can be converted to heat flux by solving the heat conduction equation with the finite difference method. This paper concentrates on the heat flux on the divertor with different discharge conditions on EAST. Experimental results show that the heat flux on the divertor plate has a strong in-out asymmetry under different configurations. The in-out asymmetry in double null configuration is stronger than that in upper single null configuration. Meanwhile, Argon gas puffing has been introduced in EAST to control the divertor heat flux, which shows that argon injection from either the upper outer divertor or the upper dome is very effective at reducing the divertor heat flux. Whether the argon gas is introduced from the upper outer divertor or the upper dome, heat load on the inner divertor plate tends to be more easily reduced than that on the outer divertor plate, the reason for which is discussed in this paper.