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Plasma electrode bias effect on the [H.sup.-] negative-ion density in an electron cyclotron resonance volume source
- Source :
- IEEE Transactions on Plasma Science. August, 2007, Vol. 35 Issue 4, p1156, 7 p.
- Publication Year :
- 2007
-
Abstract
- 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.sup.-] extracted current reach a maximum (~1-2 x [10.sup.9] [cm.sup.-3] and ~0.5 mA/c[m.sup.2], 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. Index Terms--Electrostatic probe, hydrogen, microwaves, negative ions, photodetachment, plasma electrode (PE) bias.
Details
- Language :
- English
- ISSN :
- 00933813
- Volume :
- 35
- Issue :
- 4
- Database :
- Gale General OneFile
- Journal :
- IEEE Transactions on Plasma Science
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.168210282