Recent results

Interaction of a 300 GeV pion^– on a Cu target with four reconstructed particles. The beam comes from the left and the pion position is first determined in a singlet layer (shown on the left). After the interaction in the target (in red, in the center of the picture), charged particle tracks are reconstructed on the two doublet layers (shown on the right).

· Tracking performance studied with a beam telescope formed by alignining three sensors in a doublet + singlet configuration

· Detection efficiency ≥ 99%  for V_dep ≥ 50V

· Single point resoltion ~1um for V_dep ≥ 50V

· SOImager-2 thinned to 70um and back-processed to allow full depletion

·  Detector tested with fluorescence X-rays from metal foils in the energy range 2.12keV— 8.60keV

· Good pulse height linearity as a function of X-ray Energy

· Quantum efficiency agrees with calculation

· A thin SOImager-2 was tested with high momentum charged pions at the CERN SPS operated in full depletion with three sensors in a doublet + singlet configuration

· Pulse height consistent with the depletion thickness

· Detection efficiency ~ 96%  for V_dep ≥ 50V

· Single point resolution ~1.8um for V_dep ≥ 50V

· Tracking and vertexing studied with the singlet located upstream a Cu target

· Charged multiplicity of inelastic p^--Cu interactions: 2.16±0.18

· Two-track separation ~50um (i.e. four pixels)

· Vertex resolution 8.4mm transverse and ~350-500um longitudinal

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