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The Vera C. Rubin Observatory's LSST Camera (LSSTCam) pixel response has beencharacterized using laboratory measurements with a grid of artificial stars. Wequantify the contributions to photometry, centroid, point-spread function size,and shape measurement errors due to small anomalies in the LSSTCam CCDs. Themain sources of those anomalies are quantum efficiency variations and pixelarea variations induced by the amplifier segmentation boundaries and"tree-rings" - circular variations in silicon doping concentration. Thislaboratory study using artificial stars projected on the sensors shows overallsmall effects. The residual effects on point-spread function (PSF) size andshape are below $0.1\%$, meeting the ten-year LSST survey science requirements.However, the CCD mid-line presents distortions that can have a moderate impacton PSF measurements. This feature can be avoided by masking the affectedregions. Effects of tree-rings are observed on centroids and PSFs of theartificial stars and the nature of the effect is confirmed by a study of theflat-field response. Nevertheless, further studies of the full-focal plane withstellar data should more completely probe variations and might reveal newfeatures, e.g. wavelength-dependent effects. The results of this study can beused as a guide for the on-sky operation of LSSTCam.

Photometry, Centroid and Point-Spread Function Measurements in the LSST Camera Focal Plane Using Artificial Stars