Performance evaluation of Time Projection Chamber for LEPS2/SPring-8

 SPring-8 is one of the largest synchrotron radiation facility in the world.

LEPS2 is a beamline of SPring-8, which provides the gamma ray beam in the energy range of 1.5 to 3 GeV for the hadron photoproduction experiments. We are planning to the various hadron production experiments at LEPS2 using LEPS2 spectrometer. The detectors of LEPS2 spectrometer are installed in the solenoid magnet. The detectors development is now undergoing.

 Time Projection Chamber (TPC) is the central detector, The target is installed in the TPC, and the TPC detects the track of charged particles scattered in polar angle range of 50 to 110 with respect to the target. The TPC for LEPS2 (LEPS2TPC) is a hexagonal shape. The diameter of the sensitive area is1190 mm, and the maximum drift distance is 710 mm. The signals from TPC are read through 10422 pads. We performed the test experiments to evaluate the performance of LEPS2TPC by using gamma ray beam at LEPS2. We analyzed this data and evaluated the detection efficiency of TPC and the drift length dependence and angle dependence of the position resolution of TPC. In this presentation, we report the performance LEPS2TPC.