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Analysis for shaping the ITER first wall

Funded under: FP7-EURATOM


A fundamental difference between ITER and present devices is the need to shield against 14 MeV neutrons. This has major consequences for plasma start-up/rampdown (su/rd) and also for protecting the first wall from plasma contact. This has led to design decisions: (a) not to place in front of the n-absorbing blanket a separate wall-limiter structure, (b) to modularize the blanket into ~400 remote handling compatible blanket modules (BM), and (c) to shape the front face of the BMs for plasma contact. Combined protection-su/rd options are considered here for the inner and outer wall with regard to optimal shaping. Unfortunately, the modularity of the BM system (inter-BM gaps and misalignments) requires shaping of the BM faces that increases peak power loads by ~10× relative to the ideal (continuous, circular) wall-limiter. Fortunately, the level may still be acceptable, ~2 MW/ m{2}, even for su/rd power of 7 MW.

Additional information

Authors: STANGEBY P C, University of Toronto Institute for Aerospace Studies, Toronto (CA);MITTEAU R, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An oral paper given at: 18th International Conference on Plasma-Surface Interactions in Controlled Fusion Device Organised by: Laboratorio Nacional de Fusión Held in: Toledo (ES)
Availability: This article can be accessed online by subscribers, and can be ordered online by non-subscribers, at:
Record Number: 200910343 / Last updated on: 2009-09-22
Original language: en
Available languages: en
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