The search for electric dipole moments of particles in storage rings requires the development of dedicated electrostatic deflector elements. The JEDI prototype-ring design consists of more than 50 electric deflectors of 1 m length with 60 mm spacing between the plates with electric fields of 10 MV m−1. This paper presents studies of scaled-down uncoated prototype electrodes with 10 mm radius made of stainless steel. The electric field at electrode gap distances from 1 mm to 0.05 mm increased from 15 to 90 MV m−1. In future investigations, we will study different materials and coatings at similar electrode spacings. Preparations are also underway to study large deflector elements.

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