ProtoDUNE-SP is a Liquid LArTPC built at the CERN neutrino platform. In a LArTPC many factors, including Space Charge Effect, attenuation due to electronegative impurities, diffusion, and inactive wires, lead to non-uniformity in the charge deposition in various parts of the detector. We use the detector response for the through-going cosmic muons as a data-driven correction to remove any non-uniformities in the charge deposition throughout the TPC. We then perform the energy scale calibration using a sample of stopping cosmic muons such that we have a portion of a track for which dE/dx is theoretically known to better than 1%. In this method, we calculate the correction factors to remove non-uniformity in dQ/dx in each part of the detector and in time. We then find the absolute calibration constant to convert dQ/dx to dE/dx comparing observed values with theoretical predictions.
Cosmic muons as a calibration source for charge and energy calibration of the ProtoDUNE-SP LArTPC.