Abstract
The Tokamak de Varennes experiment comprises a double-null poloidal divertor and intends studying in a high duty factor sequence, discharges for times of up to 30 s, each discharge lasting between 100 ms and 1 s, with a 15 min interval between sequences. A total energy of up to 6 MJ has to be absorbed by the divertor plates resulting from a constant loading by an exponential power distribution on either side of the separatrix (260 W/cm 2 peak power with 2 cm width outside the separatrix and 0.2 cm inside). Energy removed from plasma is in present experiments stored in divertor plates and removed from these between successive discharges. Active cooling of plates is required for high heat-flux density and also for long pulse discharges. This paper examines various materials for inertial cooling. Two designs based on active cooling are also presented. It is found that inertial cooling is insufficient, active cooling of the plates during and in-between sequences being necessary.
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