At the University of Frankfurt, a high current H− ion source was developed and tested. A H− beam current of 120 mA with an energy of 35 keV was extracted using an emission opening radius of 5 mm. This source was equipped with a diode extraction system. Thus, the extraction voltage determines the beam energy, depending on the plasma density. In order to adjust the extraction voltage independently from the beam energy, a 65 kV extractor is being designed. It consists of a compact four electrode (tetrode) system. The electron dumping will be performed after the tetrode system. For computing three dimensional magnetic field distributions the code AMPERES has been used. The influence of magnetic fields on the beam path has been taken into account. The article presents the layout of a compact 65 kV extractor for 120 mA H−.

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© 2004 American Institute of Physics.
2004
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