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3-D PARALLEL SIMULATION OF CONTINUOUS BEAM-CLOUD INTERACTIONS

A new 3D Particle-In-Cell (PIC) model for continuous modelling of beam and electron cloud interaction in a circular accelerator is presented. A simple model for lattice structure, mainly the quadruple and dipole magnets and chromaticity have been added to a plasma PIC code, QuickPIC, used extensively to model plasma Wakefield acceleration concept. The code utilizes parallel processing techniques with domain decomposition in both longitudinal and transverse domains to overcome the massive computational costs of continuously modelling the beam-cloud interaction. Through parallel modelling, we have been able to simulate beam propagation through up to 2000 turns of the LHC ring. Emittance and spot size growths have been studied for various circular accelerators and storage rings, (e.g. CERNSPS, LHC) and the results compared with the previous single-kick models for electron cloud (e.g. HEADTAIL). The growth predicted by our code is generally less than that predicted by these models. It is also shown that the single kick approximation may not be accurate for beamelectron cloud modelling due to the highly nonlinear nature of the problem.