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The rate of He ash accumulation has long been recognised to be a fundamentally important determinant of fusion reactor performance, and this view has been reinforced by studies carried out during the Conceptual Design Activity of the International Thermonuclear Experimental Reactor (ITER) project. At present, there is debate on whether to use the more pessimistic L-mode energy confinement scaling to determine the size of Next Step devices, such as ITER, because L-mode plasmas have adequate He removal properties. On the other hand, improved energy confinement in H-mode plasmas is accompanied by improved particle confinement and hence (it is assumed) by increased He accumulation. The subject areas covered in the workshop were: - the role of He transport and removal for reactors in general and for specific Next Step devices such as ITER; - the status of present experiments (JET, JT-60, TFTR, DIII-D, ASDEX, TEXT and TEXTOR); - the status of modelling; - proposals for new He removal concepts; - plans for future experiments.

Additional information

Authors: HOGAN J T ET AL., Oak Ridge National Laboratory, Fusion Energy Division (US)
Bibliographic Reference: Article: Nuclear Fusion, Vol. 31 (1991) No. 11, pp. 2181-2191
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