Confined alpha distribution measurements in a deuterium-tritium tokamak plasma

G. McKee, R. Fonck, B. Stratton, R. Bell, R. Budny, C. Bush, B. Grek, D. Johnson, H. Park, A. Ramsey, E. Synakowski, G. Taylor

Research output: Contribution to journalArticlepeer-review

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Abstract

Fusion-produced alpha particles with energy 0.7 MeV have been spectroscopically observed in the core of a deuterium-tritium plasma in the TFTR tokamak at alpha densities of 3×1016 m-3. During a sawtooth-free discharge, the measured energy spectra at r/a=0.3 are in good agreement with those predicted on the basis of collisional transport. Time-resolved measurements during the alpha thermalization after alpha source turn-off show decay of the distribution function to lower energies consistent with the classical slowing-down time of 0.5 s.

Original languageEnglish
Pages (from-to)649-652
Number of pages4
JournalPhysical Review Letters
Volume75
Issue number4
DOIs
StatePublished - 1995

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