Electron-cloud Build-up Simulations in the Proposed PS2: Status Report (original) (raw)

A replacement for the PS storage ring is being considered, in the context of the future LHC accelerator complex upgrade, that would likely place the new machine (the PS2) in a regime where the electron-cloud (EC) effect might be an operational limitation. We report here our present understanding of the ECE build-up based on simulations. We focus our attention on the bending magnets and the field-free regions, and consider both proposed bunch spacings of 25 and 50 ns. The primary model parameters exercised are the peak secondary emission yield (SEY) delta_{m}ax, and the electron-wall impact energy at which SEY peaks, E_{m}ax. By choosing reasonable values for such quantities, and exploring variations around them, we estimate the range for the EC density n_{e} to be expected in nominal operation. We present most of our results as a function of bunch intensity N_{b}, and we provide a tentative explanation for a curious non-monotonic behavior of n_{e} as a function of N_{b}. We explore ...