Speaker
Description
The Electron-Ion collider (EIC) is designed to collide spin-polarized beams of electrons and ions to study with precision the dynamics of gluons and sea quarks and their role in the structure of visible matter. The ePIC is a general-purpose large-acceptance detector and will be the first experiment operated at the EIC. For studies aiming at the three-dimensional structure of nucleons and nuclei and gluon density saturation. It requires the identification of far-angle photons and tagging spectator neutrons. Zero Degree Calorimeter (ZDC) is proposed to achieve reasonable energy resolution for neutrons(~beam energy) and photons(0.1 to 40 GeV), respectively. The position resolution is also asked to be better than 3mrad/sqrt(E) for neutrons and 1mm for photons. We developed the first electromagnetic calorimeter prototype using 64 LYSO crystals, each size 7.12mm x 7.12mm x 88mm, and SiPMs for the ZDC. The calibration was done with Co60 and Na22 radiation sources. This February, a beam test was performed in ELPH in Japan with 50MeV to 823MeV positron beam. The results from the calibration and test beam will be shown in this presentation.
