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We report first non-perturbing measurements of energy distribution function of confined DT fusion alpha-particles, made in the Joint European Torus using a neutral particle analyzer. We demonstrate significant direct neutralization of alpha-particles in charge-exchange reactions with the helium-like ions of main intrinsic plasma impurities in high temperature plasmas. We have also measured for the first time in a tokamak plasma MeV energy deuterons produced by close collisions between fusion alpha-particles and plasma fuel ions, which are neutralized by hydrogen-like ions of the impurities. Both processes contribute to measured flux to the analyzer, and allow f-alpha(e-alpha) to be determined.

Additional information

Authors: KOROTKOV A A, AF Ioffe Institute, St Petersburg (RU);GONDHALEKAR A, AF Ioffe Institute, St Petersburg (RU);AKERS R J, UKAEA Fusion, Abingdon (GB)
Bibliographic Reference: Article: Measurement of Energy Distribution of Deuterium-Tritium Fusion alpha-particles and the MeV Energy Knock-on Deuterons in JET Plasmas, JET-P(98)25
Record Number: 199910791 / Last updated on: 1999-05-28
Original language: en
Available languages: en