Longitudinal Schottky spectra of a bunched Ne10+ion beam at the CSRe

The longitudinal Schottky spectra of a radio-frequency(RF) bunched and electron cooled22Ne10+ion beam at 70 MeV/u have been studied by a newly installed resonant Schottky pick-up at the experimental cooler storage ring(CSRe),at IMP.For an RF-bunched ion beam,a longitudinal momentum spread of p/p = 1.6×10 5has been reached with less than 107stored ions.The reduction of momentum spread compared with a coasting ion beam was observed from Schottky noise signal of the bunched ion beam.In order to prepare the future laser cooling experiment at the CSRe,the RF-bunching power was modulated at 25th,50thand 75thharmonic of the revolution frequency,efective bunching amplitudes were extracted from the Schottky spectrum analysis.Applications of Schottky noise for measuring beam lifetime with ultra-low intensity of ion beams are presented,and it is relevant to upcoming experiments on laser cooling of relativistic heavy ion beams and nuclear physics at the CSRe.