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Plasma Electrode Bias Effect on the \hbox {H}^{-} Negative-Ion Density in an Electron Cyclotron Resonance Volume Source

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4 Author(s)
Svarnas, P. ; Centre Nat. de la Recherche Sci., Marcoussis ; Breton, J. ; Bacal, M. ; Faulkner, R.

The role of the plasma electrode (PE) bias in the extraction process in a large-volume hybrid multicusp negative-ion source, which is driven by 2.45-GHz microwaves, is studied. Spatially resolved negative-ion and electron density measurements close to the extractor aperture were performed under various pressures (1-4 mtorr) by means of the electrostatic probe and photodetachment technique. As the low positive voltage applied to the PE is slightly increased (from 4 to 7 V), the electron temperature passes through a minimum (0.2-0.6 eV), while simultaneously, both the negative-ion density and the H extracted current reach a maximum (~1-2 times 109 cm-3 and ~0.5 mA/cm2, respectively). Optimum pressure values for the extracted negative-ion current and the negative-ion density are found between ~1.5 and 3 mtorr. It is deduced that the negative-ion density measured in the center of the source cannot be directly correlated with the ion extracted current. The electron density and the associated extracted electron current linearly decrease as a function of the PE bias. The physical mechanisms explaining the experimental results are discussed.

Published in:

Plasma Science, IEEE Transactions on  (Volume:35 ,  Issue: 4 )

Date of Publication:

Aug. 2007

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