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An electron-impact ion source based on photoelectron emission was developedfor ionization of gases at pressures below 1e-4 mbar in an axial magnetic fieldin the order of 5 T. The ion source applies only DC fields, which makes itsuitable for use in the presence of equipment sensitive to radio-frequency (RF)fields. The ion source was succesfully tested under varying conditionsregarding pressure, magnetic field and magnetic-field gradient, and the resultswere studied with the help of simulations. The processes in the ion source arewell understood and possibilities for further optimization of generated ioncurrents are clarified.

Ion source for tests of ion behavior in the KATRIN beam line