Study of cubic and hexagonal cell geometries of a 3D diamond detector with a proton micro-beam

•3D diamond detector with hexagonal and cubic cells fabricated•Performance of hexagonal and cubic cells comparable•Differences in charge sharing observed, important for application scenario

A detector from single crystal synthetic diamond with conducting wires has been prepared with an improved femto-second laser process. The detector was characterised with a 4.5 MeV proton micro-beam (Ruđer Bos̆ković Institute, Zagreb). The charge collection efficiency and the transient current response have been investigated with high spatial resolution. A hexagonal and square cell geometry is investigated. Both cell geometries show full charge collection at 40 V bias voltage, and little charge sharing between neighbouring cells. The experimental data is compared to a simulation and qualitative agreement is observed.

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