Speaker
Description
The generation of high intensity ion beams requires high
density plasma in the ion source. Earlier studies have
shown how high plasma densities can be achieved with a
combined RF- and arc-discharge without using a filament
as an electron emitter. While space charge compensation in
the extraction region could benefit the space charge limited
extraction of high intensity beam, in conventional extrac-
tion systems however the compensating electrons need to be
blocked from entering the extraction region by means of a
suppression voltage to prevent sparking in the high voltage
gap. Therefore we propose the controlled use of a separately
produced electron beam to compensate space charge right
at the extraction gap. The concept of achieving superposi-
tion of electron and ion beam by propagating the e- beam
through the plasma generator chamber is evaluated. First
beam dynamics simulations for the electron beam as well as
extraction studies for the compensated and non-compensated
case are presented.
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