Readout Electronics of the Prototype Beam Monitor in the HIRFL-CSR External-Target Experiment

The External-target Experiment (CEE) at the Cooling Storage Ring of Heavy-Ion Research Facility in Lanzhou (HIRFL-CSR) will be first large-scale experiment nuclear physics independently developed China covering GeV energy regime. beam monitor located center front CEE accurately measures position particles with a few tens um accuracy non-interceptive way. This unique advantage significantly improves particle track reconstructions. monitor’s readout electronics consist Front-end module (FEM), Readout Control Module (RCM), and Clock Synchronization (CSM). novel Topmetal series pixel sensors directly collect ionized charge along ion while it passes through gas monitor. Lab test proves that have an INL less than 1%. In addition, prototype can measure 40Ar 320 MeV/u resolution ~6.9 μm. paper discuss design, characterization, electronics.