The longitudinal Schottky spectra of a radio-frequency （RF） bunched and electron cooled 22Ne1~＋ ion beam at 70 MeV/u have been studied by a newly installed resonant Schottky pick-up at the experimental cooler stora...The longitudinal Schottky spectra of a radio-frequency （RF） bunched and electron cooled 22Ne1~＋ 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 Ap/p=l.6~lO-5 has been reached with less than 107 stored 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, 50th and 75TM 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.展开更多
基金National Natural Science Foundation of China (10921504)
文摘The longitudinal Schottky spectra of a radio-frequency （RF） bunched and electron cooled 22Ne1~＋ 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 Ap/p=l.6~lO-5 has been reached with less than 107 stored 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, 50th and 75TM 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.
