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 Vol. 85; no. 6; pp. 1246 - 1249
Main Authors:	Kallne, J, Ballabio, L, Frenje, J, Conroy, S, Ericsson, G, Tardocchi, M, Traneus, E, Gorini, G
Format:	Journal Article
Language:	English
Published:	United States 07-08-2000
Subjects:	JET DEUTERIUM-TRITIUM PLASMAS DIAGNOSTICS
Online Access:	Get full text
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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