Measurement of 2D current distribution in the fast ion beam
Abstract
We present a technique for measurement of current density distribution in cross-section of ion beam of electrostatic accelerator. The technique is based on the detection of ion induced X-ray emission from special target that may be moved across the beam in two mutually perpendicular directions. The target consists of an aluminium disk with molybdenum core. 2D current density distributions were measured in a 3 mm diameter proton beam of the “Sokol” accelerator at NSC KIPT with the use of such target with 0.3 mm molybdenum core. Those distributions show appreciable deviation from axial symmetry. The inferred distribution allow to accurately evaluate the beam effective area. Thereby the effective value of fluence in ion beam irradiation experiments may be calculated under conditions when beam scanning is undesirable.
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Copyright (c) 2013 V.N. Bondarenko, A.V. Goncharov, V.I. Sukhostavets
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