Cooler Solenoid Length 800 mm Effective Cooling Length 440 mm ELECTRON COOLING EXPERIMENTS AT S-LSR

The electron cooler for S-LSR was designed to maximize the cooling length in the limited drift space of the ring. The effective cooling length is 0.44 m, while the total length of the cooler is 1.63 m. The one-dimensional ordering of protons is one of the subjects of S-LSR. Abrupt jumps in the momentum spread and the Schottky noise power have been observed for protons at a particle number of around 2000. The beam temperature was 0.17 meV and 1 meV in the longitudinal and transverse directions at the transition, respectively. The normalized transition temperature of protons is close to those of heavy ions at ESR. The lowest momentum spread below the transition was 1.4x10-6, which corresponded to the longitudinal beam temperature of 26 μeV (0.3 K). It is close to the longitudinal electron temperature