Abstract
Velocity distributions of the electrons have been measured by a Thomson-scattering method with an eight-channel polychoromator in the initial stage of a linear turbulent-heating experiment. Flat-top distributions were observed associated with high-frequency fluctuations ($\ensuremath{\omega}\ensuremath{\lesssim}{\ensuremath{\omega}}_{\mathrm{pi}}$) just before the onset of fast heating of the electrons. Those results were compared with computer simulations and theoretical analysis based on quasilinear process.
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