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The paper presents a conceptual study of an innovative divertor plate for the physical phase of the ITER/NET reactor. The main distinguishing feature of the new concept is the use of a single material, a carbon fibre reinforced carbon (CFC) composite with ultra-high thermal conductivity carbon fibres, for the whole structure, i.e. for the protective armour, heat sink and cooling channels. The main potential advantages of such a solution are perceived to be elimination of the severe joint-interface problems inherent to other multimaterial solutions, weak interaction with runaway electrons, low-activation properties and reduction of mechanical stresses induced by electromagnetic transients. Moreover, the use of helium as a coolant leads to the following additional advantages: avoidance of the risk of burn-out, flexibility towards different operating scenarios, ease of baking at high temperature, lower tritium inventory in the CFC material and avoidance of the sharp pressure rise in the cooling circuit because of water evaporation due to runaway electron impact. The thermal performance assessment shows that the maximum surface temperature can be kept below the threshold for radiation enhanced sublimation with comparable pumping power to that required by water cooling with turbulence promoters.

Additional information

Authors: MATERA R, JRC Ispra (IT);MEROLA M, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Tenth Topical Meeting on the Technology of Fusion Energy, Boston (US), June 7-11, 1992
Availability: Available from (1) as Paper EN 36799 ORA
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