Fudan Multi-purpose Active TArget Time Projection Chamber (fMeta-TPC) for Photonnuclear Reaction Experiments

Active Target Time Projection Chambers (AT-TPCs) are state-of-the-art tools in the field of low-energy nuclear physics, particularly suitable for experiments using low-intensity radioactive ion beams or gamma rays. The Fudan Multi-purpose Active Target Time Projection Chamber (fMeta-TPC) with 2048 channels has been developed to study α-clustering nuclei. { In this work, the focus is on the study of the photonuclear reaction with the Laser Compton Scattering (LCS) gamma source, especially for the decay of the highly excited α-cluster state.} The design of fMeta-TPC is described and a comprehensive evaluation of its offline performance is performed by ultraviolet (UV) laser and ²⁴¹Am α source. The result shows that the intrinsic angular resolution of the detector is within 0.30∘ and has an energy resolution of 6.85% for 3.0 MeV α particles. The gain uniformity of the detector is about 10% (RMS/Mean), tested by the ⁵⁵Fe X-ray source.