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The design and construction of a recoil detector for the measurement ofrecoil protons of antiproton-proton elastic scattering at scattering anglesclose to 90$^{\circ}$ are described. The performance of the recoil detector hasbeen tested in the laboratory with radioactive sources and at COSY with protonbeams by measuring proton-proton elastic scattering. The results of laboratorytests and commissioning with beam are presented. Excellent energy resolutionand proper working performance of the recoil detector validate the conceptualdesign of the KOALA experiment at HESR to provide the cross section data neededto achieve a precise luminosity determination at the PANDA experiment.

A recoil detector for the measurement of antiproton-proton elastic scattering at angles close to 90$^{\circ}$