ELECTRON CLOUD SELF-CONSISTENT SIMULATIONS FOR THE SNS RING

This paper presents a computational investigation of the electron-proton instability in the Spallation Neutron Source (SNS) ring. The simulations have been performed using the ORBIT code, which includes a self-consistent electron-cloud model for long-bunched proton beams. The model features simultaneous calculations of the dynamics of the proton bunch, the electron cloud and a realistic secondary emission surface model. The frequency spectra and growth rates of the proton bunch transverse instability are studied as functions of the RF cavity voltage