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- W1967401050 abstract "Ion sources with electrostatic containment of the primary electrons are very attractive since they possess an upgraded ionization efficiency and are simple to realize. However, their plasma potential is quite different from the potential of the plasma electrode, which supports extraction apertures, resulting in a non-negligible space-charge sheath between the plasma and the extraction plane. An experimental comparative study of the extraction of an ion beam with and without electrostatic containment shows the influence of the space-charge sheath on the extracted ion beam characteristics. For the same extraction potential condition, the ion beam current is lowered when the ion source uses the electrostatic containment. For monoaperture applications, an improvement of the ERIS structure in which the anode is the extraction aperture itself has been tested. In this case, space-charge sheath effects in the extraction area are negligible and the matching conditions are much better than with a standard reflex structure. For multiaperture applications, space-charge sheath effects in the extraction area are reduced when the plasma grid is positively biased with respect to the cathode potential. Experimental results prove that this polarization permits to upgrade transmission of beamlets." @default.
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- W1967401050 date "1992-04-01" @default.
- W1967401050 modified "2023-10-18" @default.
- W1967401050 title "Beam extraction from ion sources with electrostatic containment" @default.
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- W1967401050 doi "https://doi.org/10.1063/1.1142797" @default.
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