Suprathermal fuel ions from α-particle knock-on collisions in fusion DT plasmas are predicted to cause a weak feature in the neutron spectrum of d+t→α+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 α-particle diagnostics for future self-heated fusion plasmas.
Källne, J., Ballabio, L., Frenje, J., Conroy, S., Ericsson, G., Tardocchi, M., et al. (2000). Observation of the alpha particle 'knock-on' neutron emission from magnetically confined DT fusion plasmas. PHYSICAL REVIEW LETTERS, 85(6), 1246-1249 [10.1103/PhysRevLett.85.1246].
Observation of the alpha particle 'knock-on' neutron emission from magnetically confined DT fusion plasmas
GORINI, GIUSEPPE
2000
Abstract
Suprathermal fuel ions from α-particle knock-on collisions in fusion DT plasmas are predicted to cause a weak feature in the neutron spectrum of d+t→α+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 α-particle diagnostics for future self-heated fusion plasmas.
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