Overview on the HIRFL-CSR facility

The status of the HIRFL (Heavy Ion Facility in Lanzhou) – Cooler Storage Ring (CSR) at the IMP is reported. The main physics goals at the HIRFL-CSR are the researches on nuclear structure and decay property, EOS of nuclear matter, hadron physics, highly charged atomic physics, high energy density physics, nuclear astrophysics, and applications for cancer therapy, space industries, materials and biology sciences. The HIRFL-CSR is the first ion cooler-storage-ring system in China, which consists of a main ring (CSRm), an experimental ring (CSRe) and a radioactive beam line (RIBLL2). The two existing cyclotrons SFC (K = 70) and SSC (K = 450) are used as its injectors. The 7 MeV/u ¹²C⁶⁺ ions were stored successfully in CSRm with the stripping injection in January 2006. After that, realized were the accelerations of ¹²C⁶⁺, ³⁶Ar¹⁸⁺, ⁷⁸Kr²⁸⁺ and ¹²⁹Xe²⁷⁺ ions with energies of 1 GeV/u, 1 GeV/u, 450 MeV/u and 235 MeV/u, respectively, including accumulation, electron cooling and acceleration. In 2008, the first two isochronous mass measurement experiments with the primary beams of ³⁶Ar¹⁸+ and ⁷⁸Kr²⁸⁺ were performed at CSRe with the Δp/p ~ 10^-5. (author)