The first dual-phase xenon TPC equipped with silicon photomultipliers and characterisation with $^{37}$Ar

Understand

For the first time, a small dual-phase (liquid/gas) xenon time projection chamber was equipped with a top array of silicon photomultipliers for light and charge readout.

• Here we describe the instrument in detail, as well as the data processing and the event position reconstruction algorithms.
• We obtain a spatial resolution of ~1.5 mm in the horizontal plane.
• To characterise the detector performance, we show calibration data with internal $^{83\text{m}}$Kr and $^{37}$Ar sources, and we detail the production of the latter as well as its introduction into the system.