IMP/CAS, Lanzhou, People’s Republic of China
The dispersion coupling effect has been successfully applied in stochastic cooling and laser cooling to realize 3D cooling. In electron cooling, the transverse cooling rate is usually smaller than the longitudinal one. By introducing dispersive cooling, it is possible to redistribute the cooling rate between the longitudinal and transverse planes. Theoretically, dispersive electron cooling can be achieved by introducing ion dispersion in the cooling section, and a transverse gradient of the longitudinal cooling force. The latter depends on many factors such as energy offset, transverse displacement, e-beam distribution, space charge effect, also the dispersion of e-beam. This means that there are several ways to achieve dispersive electron cooling. In my talk, I will give theoretical and simulation studies on dispersive electron cooling, and explain how these factors affect cooling rates. Based on the simple linear cooling force, a formula for estimating the cooling rate redistribution is also presented.
IMP/CAS, Lanzhou, People’s Republic of China
The cooling process of 20GeV proton beam was simulated in the case of different energy shift of electron beam. The changes of horizontal emittance and longitudinal momentum spread of proton beam with time was presented. The different performances in horizontal and longitudinal direction were observed comparing with the traditional low energy electron cooling. The final emittance and minimum momentum spread was demonstrated in the different parameters configuration. In order to achieve expected cooling requirements, the energy shift of electron beam should be paid enough attention in the case of high energy electron cooling, especially considering a RF accelerator as electron cooling device.