Test results of the HIRFL-CSR cluster target

The HIRFL-CSR internal target can operate in two modes: cluster target mode and polarized target mode. The cluster target may provide the gas target of H2, N2, inert gases and small molecular gases. The test experiments have been done for H2, N2 and Ar gases. The target thicknesses of 6.6×1012, 1.2×1013 and 1.0×1013 atoms/cm2 are obtained for H2, N2 and Ar gases, respectively. In this paper, the structure and the test results of the HIRFL-CSR cluster target system are reported.