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Beam-focusing characteristics of negative ion beams have been experimentallyinvestigated with a superimposition of a controlled perturbation of RF field ina filament-arc discharge negative ion source. Oscillations of a negative-ionbeamlet width and axis responding to the RF perturbation were observed, whichmay be a cause of the larger beam divergence angle of the RF negative ionsource for ITER. It is pointed out that the oscillation of the beamlet widthdepends on the perveance and on the RF frequency such that the oscillation issuppressed at perveance-matched conditions and at low RF frequency.

Response of negative ion beamlet to RF field in beam extraction region