Electron-proton dynamics for long proton bunches in high intensity proton rings

Electron clouds in intense space charge dominated proton beams may cause instabilities and emittance growth. Colleagues at the Oak Ridge National Laboratory (ORNL) and I have developed an electron cloud module and implemented it into the ORBIT Code for beam dynamics in high intensity rings.; This new module includes full 3D descriptions of the proton beam bunch and the electron cloud, including their space charge interactions and their motion in external electric and magnetic fields. The two main sources of electrons are primary electrons caused by lost protons hitting the vacuum chamber walls and secondary emitted electrons caused by electrons hitting the wall. For the latter we adopt a set of models based on those of M. Pivi and M. Furman.; This dissertation presents the development of the new electron cloud module, including benchmarks demonstrating its capability to examine the effects of the electron cloud on the proton beam and simulation studies of electron cloud dynamics. These studies include the sensitivity of the electron cloud properties to different proton beam profiles and reproduction of experimental results from the proton storage ring at Los Alamos National Laboratory.