Effect of electron beam cooling on transversal and longitudinal emittance of an external proton beam

Abstract Benefits of electron coolingto the quality of extracted ion beams from storage ringsare discussed. The transversal emittances of an external proton beam with and without electron coolingat injection energy are measured with the GEM detector assembly. While the horizontal emittance remains the vertical emittance shrinks by the cooling process. The longitudinal momentum variance is also reduced by cooling.