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The ITER divertor must exhaust most of the alpha particle power and the He ash at acceptable erosion rates. The high recycling regime of the ITER-CDA for present parameters would yield high power loads and erosion rates on conventional targets. Improvement by radiation in the SOL at constant pressure is limited in principle. To permit a higher radiation fraction, the plasma pressure along the field must be reduced by more than a factor 10, reducing also the target ion flux. The pressure reduction depends on the along-field length for neutral-plasma interaction, the parallel power flux, the neutral density, the ratio of neutral-neutral collision length to the plasma-wall distance and on the Mach number of ions and neutrals. The momentum transfer fraction to the side walls is calculated, showing that low Knudsen number is beneficial. The impact of the different physics effects on the chosen geometry and on the ITER divertor design and the lifetime of the various divertor components are discussed.

Additional information

Authors: JANESCHITZ G ET AL., Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);BORRASS K, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 220-222 (1995) pp. 73-88
Record Number: 199510750 / Last updated on: 1995-07-12
Original language: en
Available languages: en