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An experiment has been performed at the Joint European Torus (JET) which has demonstrated clear self-heating of a deuterium-tritium plasma by alpha particles produced in fusion reactions. Since the alpha power was approximately 10% of the total power absorbed by the plasma, the heating was distinguished from other changes, due to isotopic effects, by scanning the plasma and neutral bean mixtures together from pure D to nearly pure T in a hot ion H-mode with 10.5 MW neutral beam power. At an optimum mixture of 60 +/- 20% T, the fusion gain (= P(fusion)/P(absorbed)) was 0.65 and the alpha heating showed clearly as a maximum in electron temperature. The change in temperature produced by alpha heating was Delta T(e)(0)= 1.3 +/- 0.23keV in 12.2keV. The effect of the heating could also be seen in the ion temperature and energy content.

Additional information

Authors: THOMAS P R ET AL, JET Joint Undertaking, Abingdon, Oxen (GB)
Bibliographic Reference: Report: JET-P(98)10 EN (1998) 7pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon, OX14 3EA (GB)
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