Abstract
Electron cloud effects have become one of the main performance limitations for circular particle accelerators operating with positively charged beams. Among other machines worldwide, the CERN Super Proton Synchrotron (SPS) as well as the Large Hadron Collider (LHC) are affected by these phenomena. Intense efforts have been devoted in recent years to improving the understanding of electron cloud (EC) generation with the aim of finding efficient mitigation measures. In a different domain of accelerator physics, non-linear resonances in the transverse phase space have been proposed as novel means of manipulating charged particle beams. While the original goal was to perform multi-turn extraction from the CERN Proton Synchrotron (PS), several other applications have been proposed. In this paper, the study of EC generation in the presence of charged particle beams with multimode horizontal distribution is presented. Such a peculiar distribution can be generated by different approaches, one of which consists in splitting the initial Gaussian beam distribution by crossing a non-linear resonance. In this paper, the outcome of detailed numerical simulations is presented and discussed.
Highlights
Electron cloud effects have become one of the main performance limitations for circular particle accelerators operating with positively charged beams
These electrons can be accelerated by the electric field of the beam, typically to energies in the order of hundreds of electronvolts and when they impact on the walls, secondary electron emission might occur and multiple lower-energy electrons would be emitted
Results of numerical simulations of electron cloud (EC) effects. – PyECLOUD is a 2D macroparticle (MP) code, where the electrons are grouped in MPs to achieve a reasonable computational burden
Summary
Electron cloud effects have become one of the main performance limitations for circular particle accelerators operating with positively charged beams. The study of EC generation in the presence of charged particle beams with multimode horizontal distribution is presented.
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