  The longitudinal Schottky spectra of a radio-frequency (RF) bunched and
electron cooled 22Ne10+ 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
has been reached with less than 107 stored ions. The reduction of momentum
spread compared with 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, 50th and
75th harmonic of the revolution frequency, effective 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.
