Influence of RF-parameters on beam lifetime

The Pulse Stretcher/Storage Ring AmPS will use a 2856 MHz RF system for the operation in Stretcher Mode. In order to obtain reasonable lifetimes in Storage Mode, a rather high RF voltage will be required at this frequency: at E = 900 MeV a voltage of VRF = 710 kV is needed to create a bucket size of 7 σε σε being the equilibrium energy spread). At a lower frequency the RF voltage is less (e.g. when f - 500 MHz, only 140 kV is neded - at E = 900 MeV - to create the same bucket size). For this reason it is considered to add an additional low-frequency (e.g. f = 500 MHz) RF system for operation in Storage Mode. For commissioniing purposes, however, the 2856 MHz system can be used for energies up to 650-700 MeV (author). 5 refs.; 6 tabs