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(ITERP/10(R)) Basic Divertor Operation in ITER-FEAT

A. S. Kukushkin¹⁾, G. Janeschitz¹⁾, A. Loarte²⁾, H. D. Pacher³⁾, D. P. Coster⁴⁾, G. Matthews⁵⁾, D. Reiter⁶⁾, R. Schneider⁷⁾, V. Zhogolev^8)
 
1) 1) ITER JCT, Boltzmannstr. 2, 85748 Garching, Germany
²⁾ EFDA, Close Support Unit, Garching, Germany
³⁾ INRS-Energie et Matériaux, Varennes, Québec, Canada
⁴⁾ Max-Planck-Institut für Plasmaphysik, Garching, Germany
⁵⁾ JET Joint Undertaking, Abingdon, United Kingdom
⁶⁾ FZ Jülich, Jülich, Germany
⁷⁾ Max-Planck-Institut für Plasmaphysik, Greifswald, Germany
⁸⁾ RSC ``Kurchatov Institute'', Moscow, Russia

Abstract.  This paper summarises the modelling studies of steady-state divertor operation being performed for the ITER-FEAT design. Optimisation of the divertor geometry reveals the importance of the proper target shape for a reduction of the peak power loads. A high gas conductance between the divertor legs is also essential for maintaining acceptable conditions in the outer divertor which receives higher power loading than the inner. Impurity seeding, which would be necessary if tritium co-deposition concerns preclude the use of carbon as plasma-facing material, can ensure the required high radiation level at acceptable Z_eff, and the divertor performance is not very sensitive to the choice of the radiating impurity.

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