sPHENIX TPC Performance in First Two Runs

The sPHENIX experiment at RHIC was fully assembled and began its first commissioning run in the summer of 2023. The aim of the experiment will be to further investigate the microscopic nature of the QGP through precision measurements of jets, the upsilon, and open heavy flavor probes over a broad pT range. The Time Projection Chamber (TPC) is one of the main tracking detectors in the experiment. It is designed to operate in a 1.4 T magnetic field at high collision rates and provides a rapidity coverage of |η|<1.1 over the full azimuth. Amplification in the TPC is performed by quadruple-GEM stack detectors designed to limit IBF to less than one percent. The signals from the TPC are collected with zigzag patterned readout pads, and processed with a SAMPA ASIC. The stability of the GEM performance is controlled using a fast trip protection system that identifies sparking events within the GEM stack. Two laser systems are installed within the TPC to calibrate the static and dynamic distortions of the drift field both between and during beam runs. In this talk, we will present the highlights of TPC performance in the first two operation runs of sPHENIX.