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Two different measurements of the divergence of high-current ion beams formed in a multiaperture ion source have been made. The current dependence of both measurements shows characteristic differences which are explained as a result of an inhomogeneity of the current density across the emission area. The model of Coupland et al. with a spherical beam geometry in the acceleration gap is re-examined. It is shown that a rigorous application of this model gives a beamlet defocusing in the decel electrode which is stronger than assumed previously by a factor of 1.35. The implications on offset steering are discussed.

Additional information

Authors: OTT W, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);PENNINGSFELD F-P, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: IPP 4/252 EN (1992) 10 pp.
Availability: Available from Max-Planck-Institut für Plasmaphysik, 8046 Garching bei München (DE)
Record Number: 199211265 / Last updated on: 1994-11-29
Original language: en
Available languages: en