New measurements of the electron thermal diffusivity coefficient χ e for beam-heated (0–1.6 MW) discharges in the Impurity Study Experiment (ISX-B) tokamak confirm the numerical values and trends, with beam power inferred earlier from power balance considerations, and thus support the conclusion that the confinement deterioration with increasing beam power is due to enhanced electron heat conduction losses.
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Bell et al. (1984) studied this question.
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