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ELECTRON-CLOUD SIMULATIONS FOR SPS AND LHC

The electron cloud causes an increase in the vacuum pressure. It also induces slow multi-bunch and fast singlebunch instabilities, and, for the LHC, it significantly increases the heat load on the cryogenics system. This report describes our computer model of the electron cloud build up, presents simulation results for SPS and LHC, and investigates how the electron-cloud density can be reduced by modified fill patterns.