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It is common practice to test the optical properties of photomultiplier tubes(PMTs) by illuminating the entire photocathode region from the front at onceand measuring the average performance. However, for optimal utilisation of thePMT performance in experiments, especially in the single-photon region, it isessential to also know the systematic variations across the photocathode, whichrequires measurements with focused light sources that illuminate only smallregions of the PMT. We present a detailed uniformity characterisation of thegain, transit time, transit time spread, and pulse shape of the 80$\,$mmHamamatsu R15458-02 PMT. We find that the parameters exhibit asymmetry alongone axis, likely caused by the position and geometry of the dynode system. Forall parameters except the transit time, the observed variations are small giventhe intrinsic variation of the parameters. For positions with shifted transittime we observe on average underamplified pulses which can potentially beexploited to improve the pulse reconstruction.

Homogeneity of the Photocathode in the Hamamatsu R15458-02 Photomultiplier Tube