Energy Calibration of the Muenster Dual-Phase Xenon Time Projection Chamber

The Muenster dual-phase xenon time projection chamber (TPC), an experiment of the Institut fuer Kernphysik in Muenster, is designed according to the XENON100 TPC, which aimed for direct detection of dark matter. Due to its high atomic number, the self-shielding against gamma-rays and the high purity, liquid xenon is a very capable material for detectors in particle and astroparticle physics and specifically for dark matter direct detection experiments. The Muenster TPC contains a maximum of 2.6 kg pure liquid xenon in a highly reflecting polytetrafluoroethylene (PTFE) vessel and is equipped with 14 photomultipliers (PMTs). Its signals are analyzed by the processor for analyzing XENON (PAX), which was developed for XENON1T. A deep understanding of the detector is necessary for any future scientific work. Therefore, the characterization of the TPC is shown, i.e. the energy calibration with the radioactive sources Kr-83m and Cs-137. This includes the determination of the electron drift lifetime, light collection efficiency and light yield.