Abstract

A muprobe system has been constructed for a 4.75 MV Van de Graaff using a compact electrostatic quadrupole triplet lens. The beam-energy homogenizer is used to improve the beam transmission through slits. The beam intensity profile is measured by scanning the beam on a copper grid. The minimum beam-spot size obtained is (4.5 ± 1.6) μm × (12.2 ± 2.1) μm for 3 MeV protons with a beam current of 1.5 nA.

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