Electron Cooling of Hot Ion Beams

We investigate a new scheme for fast electron cooling of ion beams with large momentum spread. An induction accelerator is utilized to accelerate or decelerate the stored ion beam toward the sensitive region of the electron cooling force, thus reducing the cooling time. This method will be applied for further cooling of phase rotated hot ion beams produced by a high-power short pulse laser, to be used as an injection beam for a pulsed synchrotron. The scheme was investigated experimentally at TSR with the use of a carbon beam ¹²C⁶⁺ of energy 73.3MeV , shifted by ΔP/P = 1% with respect to the momentum of the electron beam. The cooling time measured without application of IndAcc voltage is 2.8 sec and was reduced to 0.6 sec for a sweep with voltage 0.4V. Further experimental studies of the scheme were carried out at HIMAC in order to estimate the maximum voltage that can be applied with the induction accelerator without causing beam loss.