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The thermal properties of the LHCb Vertex Locator (VELO) are studied usingthe real-time detector alignment procedure. The variation of the position andorientation of the detector elements as a function of the operating temperatureof the VELO is presented. This study uses a dataset collected by the LHCbexperiment during a VELO temperature scan performed at the end of LHC Run 2(October 2018). Significant shrinkage of the VELO modules is observed at theoperating temperature of $-30^\circ$ compared to the laboratory measurements ona single module taken at a range of temperatures from $+45^\circ$ to$-25^\circ$. The thermal shrinkage expected from the extrapolation oflaboratory measurements to lower temperatures, and the results of thisalignment study are in good agreement.

Measurement of thermal properties of the LHCb VELO detector using track-based software alignment