Control of helium ash produced in deuterum-tritium fusion reactions is one of the key issues affecting the performance of a fusion reactor. The removal of He ash would be detemined by a combination of: the mintrinsic transport ofhelium in the plasma #tau#_p(He), where #tau#_p is the particle confinement time;enrichemnt and compression of helium in the divertor, #eta#(He); and the pumping efficiency for helium S_p(He).
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