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

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arxiv 1008.3342 v3 pith:USXAGEWO submitted 2010-08-19 physics.ins-det astro-ph.IM

classification physics.ins-detastro-ph.IM
keywords sourcefieldfieldsmagneticappliesaxialbeambehavior
verification ladder T0 review T1 audit T2 compute T3 formal
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An electron-impact ion source based on photoelectron emission was developed for ionization of gases at pressures below 1e-4 mbar in an axial magnetic field in the order of 5 T. The ion source applies only DC fields, which makes it suitable for use in the presence of equipment sensitive to radio-frequency (RF) fields. The ion source was succesfully tested under varying conditions regarding pressure, magnetic field and magnetic-field gradient, and the results were studied with the help of simulations. The processes in the ion source are well understood and possibilities for further optimization of generated ion currents are clarified.

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