Phys. Rev. Lett. 75, 649–652 (1995)Confined Alpha Distribution Measurements in a Deuterium-Tritium Tokamak PlasmaReceived 27 February 1995; published in the issue dated 24 July 1995 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 3×1016m-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. © 1995 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.75.649
DOI:
10.1103/PhysRevLett.75.649
PACS:
52.55.Pi, 52.25.Rv, 52.55.Fa
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