PRESENT STATUS OF ION STORAGE AND COOLER RING, S-LSR

Electron cooling time of hot proton beam having a momentum spread of 1 % was improved significantly by almost 1 order of magnitude. Applying the proton energy sweep with induction acceleration, the cooling time was reduced from 30.4 s to 1.7 s. For the first time, the creation of the 1D ordered state of a 7 MeV proton has been demonstrated at a particle number 2000 by observing a clear jump in the momentum spread. The threshold current of the coherent vertical instability excited during the E-Cool stacking process has been increased from 600 microA to 800 microA by application of a feedback damping system. A very short bunched beam with a duration of 2.5 ns created by a phase rotation after electron cooling was successfully extracted from S-LSR by a fast extraction