Abstract
The nonthermal electron velocity distribution of lower-hybrid-rf--heated plasmas in the Alcator C tokamak is deduced from measurements of electron cyclotron emission with a specialized vertical viewing optics arrangement. At a density of n${\ifmmode\bar\else\textasciimacron\fi{}}_{e}$=0.7\ifmmode\times\else\texttimes\fi{}${10}^{20}$ ${\mathrm{m}}^{\mathrm{\ensuremath{-}}3}$, the reconstructed distribution function in the range 50 keV\ensuremath{\le}E\ensuremath{\le}230 keV shows enhancement in the parallel direction with a perpendicular spread equivalent to ${T}_{\ensuremath{\perp}}$\ensuremath{\approxeq}30 keV. The line-average energetic electron density in this energy range is approximately ${10}^{17}$ ${\mathrm{m}}^{\mathrm{\ensuremath{-}}3}$ during the rf.
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