Observation of the alpha particle "Knock-On" neutron emission from magnetically confined DT fusion plasmas

Suprathermal fuel ions from alpha-particle knock-on collisions in fusion DT plasmas are predicted to cause a weak feature in the neutron spectrum of d+t-->alpha+n. The knock-on feature has been searched for in the neutron emission of high ( >1 MW) fusion-power plasmas produced at JET and was f...

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Bibliographic Details
Published in:Physical review letters 2000-08, Vol.85 (6), p.1246-1249
Main Authors: Kallne, J, Ballabio, L, Frenje, J, Conroy, S, Ericsson, G, Tardocchi, M, Traneus, E, Gorini, G
Format: Article
Language:English
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Summary:Suprathermal fuel ions from alpha-particle knock-on collisions in fusion DT plasmas are predicted to cause a weak feature in the neutron spectrum of d+t-->alpha+n. The knock-on feature has been searched for in the neutron emission of high ( >1 MW) fusion-power plasmas produced at JET and was found using a magnetic proton recoil type neutron spectrometer of high performance. Measurement and predictions agree both in absolute amplitude and in plasma-parameter dependence, supporting the interpretation and model. Moreover, the results provide input to projecting alpha-particle diagnostics for future self-heated fusion plasmas.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.85.1246