Lattice Design and Electron Cloud Instability in a High-Intensity Proton Synchrotron

Abstract

Lattice Design and Electron Cloud Instability in a High-Intensity Proton Synchrotron Eun-San Kim Department of Physics, Kyungpook National University, Daegu 702-701 (Received 7 January 2008) The proton accelerators for the neutron spallation source and nuclear experiments usually consist of a high-intensity linac and a synchrotron. An important issue in such a high intensity accelerator is to keep particle losses by beam injection from the linac and beam instabilities in the synchrotron down to an acceptable level. We show the analysis results of optics design and beam dynamics for a 4-GeV high-intensity proton synchrotron. A lattice with a high transition gamma is chosen to avoid the beam loss at the transition crossing, and the stabilities on the lattice are also investigated by examining the e ects of machine errors. We investigate the characteristics of the electron cloud instability, which may limit the beam performance in the high-intensity proton synchrotron. We present the analysis on the beam dynamics in the proton synchrotron with a low injection energy of around 100 MeV. From these results, we present the results on the choice of injection beam energy and on the available beam power in terms of the space charge e ects and the electron cloud instability. PACS numbers: 29.27.Bd, 41.60.Ap, 29.17.+w