Abstract
Two-dimensional cross-field measurements of ArII optical emission induced by hot electrons ( >19.2 eV) are made to investigate the mechanism of rf power deposition in a helicon-wave excited plasma. Hot spots of the optical emission are observed near the walls underneath the antenna conductor carrying the axial rf current. This suggests the significant electron heating by the axial electric field of antenna near-fields. Time-resolved emission measurements reveal the heating time of ∼1 µ s for the hot spots and ∼10 µ s for the bulk plasma where the wave fields dominate the near-fields.
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