Fudan Multi-purpose Active TArget Time Projection Chamber (fMeta-TPC) for photonnuclear reaction experiments

摘要: 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 $\alpha$-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 $\alpha$-cluster state.  The design of fMeta-TPC is described and a comprehensive evaluation of its offline performance is performed by ultraviolet (UV) laser and $^{241}$Am $\alpha$ source. The result shows that the intrinsic angular resolution of the detector is within \ang{0.30} and has an energy resolution of 6.85\% for \SI{3.0}{MeV} $\alpha$ particles. The gain uniformity of the detector is about 10\% (RMS/Mean), tested by the $^{55}$Fe X-ray source.