Abstract
A radiofrequency (RF) phase modulation method is applied to the Hefei Light Source II storage ring to deeply investigate its longitudinal beam characteristics and improve the beam lifetime. A theoretical analytical model and corresponding experimental measurements of single bunch length and island phenomena are examined. From a series of online machine experiments, we demonstrate that the suitable phase modulation amplitude is 0.02 rad, corresponding to an optimum modulation frequency ranging from 19.6 to 20.7 kHz of the RF system. Furthermore, the overall beam lifetime can be increased by a factor of 2.38 as a result of the beam dilution effect.
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